메뉴 건너뛰기




Volumn 49, Issue 15, 2010, Pages 1571-1580

Morphology, thermal and mechanical properties of biodegradable poly(butylene succinate)/poly(butylene adipate-co-terephthalate)/clay nanocomposites

Author keywords

Biodegradable; Nanocomposite; Organoclay

Indexed keywords

ADIPATES; BASAL SPACING; BIODEGRADABLE; CATION EXCHANGES; CLAY NANOCOMPOSITES; FRACTURE SURFACES; OCTADECYLAMINES; POLY (BUTYLENE SUCCINATE); SEM MICROGRAPHS; SODIUM MONTMORILLONITE; TENSILE MODULI; TEREPHTHALATE; THERMAL AND MECHANICAL PROPERTIES; THERMAL STABILITY; XRD;

EID: 78649959073     PISSN: 03602559     EISSN: 15256111     Source Type: Journal    
DOI: 10.1080/03602559.2010.512337     Document Type: Article
Times cited : (30)

References (41)
  • 1
    • 41549130408 scopus 로고    scopus 로고
    • Biodegradability and biodegradation of polyesters
    • Tokiwa, Y.; Calabia, B. Biodegradability and biodegradation of polyesters. J. Polym. Environ. 2007, 15 (4), 259-267.
    • (2007) J. Polym. Environ , vol.15 , Issue.4 , pp. 259-267
    • Tokiwa, Y.1    Calabia, B.2
  • 2
    • 0036117853 scopus 로고    scopus 로고
    • Synthetic Biodegrad-able aliphatic polyester/montmorillonite nanocomposites
    • Lim, S.T.; Hyun, Y.H.; Choi, H.J.; Jhon, M.S. Synthetic Biodegrad-able aliphatic polyester/montmorillonite nanocomposites. Chem. Mater. 2002, 14 (4), 1839-1844.
    • (2002) Chem. Mater , vol.14 , Issue.4 , pp. 1839-1844
    • Lim, S.T.1    Hyun, Y.H.2    Choi, H.J.3    Jhon, M.S.4
  • 3
    • 0031599284 scopus 로고    scopus 로고
    • Processability and properties of aliphatic polyesters,'BIONOLLE', synthesized by polycondensation reaction
    • Fujimaki, T. Processability and properties of aliphatic polyesters,'BIONOLLE', synthesized by polycondensation reaction. Polym. Degrad. Stab. 1998, 59 (1-3), 209-214.
    • (1998) Polym. Degrad. Stab , vol.59 , Issue.1-3 , pp. 209-214
    • Fujimaki, T.1
  • 4
    • 34247635255 scopus 로고    scopus 로고
    • Biodegradable nano-composites based on poly(butylene succinate)/organoclay
    • Shih, Y.; Wang, T.; Jeng, R.; Wu, J.; Teng, C. Biodegradable nano-composites based on poly(butylene succinate)/organoclay. J. Polym. Environ. 2007, 15 (2), 151-158.
    • (2007) J. Polym. Environ , vol.15 , Issue.2 , pp. 151-158
    • Shih, Y.1    Wang, T.2    Jeng, R.3    Wu, J.4    Teng, C.5
  • 5
    • 0348252138 scopus 로고    scopus 로고
    • New poly(butylene succinate)/layered silicate nanocomposites. II. Effect of organically modified layered silicates on structure, properties, melt rheology, and bio-degradability
    • Okamoto, K.; Ray, S.S.; Okamoto, M. New poly(butylene succinate)/layered silicate nanocomposites. II. Effect of organically modified layered silicates on structure, properties, melt rheology, and bio-degradability. J. Polym. Sci. Pt. B: Polym. Phys. 2003, 41 (24),3160-3172.
    • (2003) J. Polym. Sci. Pt. B: Polym. Phys , vol.41 , Issue.24 , pp. 3160-3172
    • Okamoto, K.1    Ray, S.S.2    Okamoto, M.3
  • 6
    • 27744501278 scopus 로고    scopus 로고
    • Poly(butylene succinate)/twice functionalized organoclay nanocomposites: Preparation, characterization, and properties
    • Chen, G.X.; Kim, E.S.; Yoon, J.S. Poly(butylene succinate)/twice functionalized organoclay nanocomposites: Preparation, characterization, and properties. J. Appl. Polym. Sci. 2005, 98 (4), 1727-1732.
    • (2005) J. Appl. Polym. Sci , vol.98 , Issue.4 , pp. 1727-1732
    • Chen, G.X.1    Kim, E.S.2    Yoon, J.S.3
  • 7
    • 1642421807 scopus 로고    scopus 로고
    • Thermal and mechanical properties of poly(butylene succinate) nanocomposites with various organo-modified montmorillonites
    • Someya, Y.; Nakazato, T.; Teramoto, N.; Shibata, M. Thermal and mechanical properties of poly(butylene succinate) nanocomposites with various organo-modified montmorillonites. J. Appl. Polym. Sci. 2004,91 (3),1463-1475.
    • (2004) J. Appl. Polym. Sci , vol.91 , Issue.3 , pp. 1463-1475
    • Someya, Y.1    Nakazato, T.2    Teramoto, N.3    Shibata, M.4
  • 8
    • 33746563612 scopus 로고    scopus 로고
    • Polymer blends and composites from renew-able resources
    • Yu, L.; Dean, K.; Li, L. Polymer blends and composites from renew-able resources. Prog. Polym. Sci. 2006, 31 (6), 576-602.
    • (2006) Prog. Polym. Sci , vol.31 , Issue.6 , pp. 576-602
    • Yu, L.1    Dean, K.2    Li, L.3
  • 9
    • 0037097273 scopus 로고    scopus 로고
    • Evaluation of compatibility and properties of biodegradable polyester blends
    • Jacob, J.; Ramaswamy, M.; Mrinal, B. Evaluation of compatibility and properties of biodegradable polyester blends. J. Polym. Sci. Pt. A: Polym. Chem. 2002, 40 (12), 2003-2014.
    • (2002) J. Polym. Sci. Pt. A: Polym. Chem , vol.40 , Issue.12 , pp. 2003-2014
    • Jacob, J.1    Ramaswamy, M.2    Mrinal, B.3
  • 10
    • 1942532950 scopus 로고    scopus 로고
    • Effect of organoclay platelets on morphology of nylon-6 and poly(ethylene-ran-propylene) rubber blends
    • Khatua, B.B.; Lee, D.J.; Kim, H.Y.; Kim, J.K. Effect of organoclay platelets on morphology of nylon-6 and poly(ethylene-ran-propylene) rubber blends. Macromolecules 2004, 37 (7), 2454-2459.
    • (2004) Macromolecules , vol.37 , Issue.7 , pp. 2454-2459
    • Khatua, B.B.1    Lee, D.J.2    Kim, H.Y.3    Kim, J.K.4
  • 11
    • 0037127914 scopus 로고    scopus 로고
    • Emulsifying effect of dimethyldioctadecyl-ammonium-hectorite in polystyrene/poly(ethyl methacrylate) blends
    • Voulgaris, D.; Petridis, D. Emulsifying effect of dimethyldioctadecyl-ammonium-hectorite in polystyrene/poly(ethyl methacrylate) blends. Polymer 2002, 43 (8), 2213-2218.
    • (2002) Polymer , vol.43 , Issue.8 , pp. 2213-2218
    • Voulgaris, D.1    Petridis, D.2
  • 12
    • 8844228196 scopus 로고    scopus 로고
    • Role of organically modified layered silicate as an active interfacial modifier in immiscible polystyrene/polypropylene blends
    • Sinha Ray, S.; Pouliot, S.; Bousmina, M.; Utracki, L.A. Role of organically modified layered silicate as an active interfacial modifier in immiscible polystyrene/polypropylene blends. Polymer 2004, 45(25),8403-8413.
    • (2004) Polymer , vol.45 , Issue.25 , pp. 8403-8413
    • Sinha Ray, S.1    Pouliot, S.2    Bousmina, M.3    Utracki, L.A.4
  • 13
    • 33746274924 scopus 로고    scopus 로고
    • Sokolov,J.C.; Rafailovich, M.H. Compatibilizing bulk polymer blends by using organoclays
    • Si, M.; Araki, T.; Ade, H.; Kilcoyne, A.L.D.; Fisher, R.; Sokolov,J.C.; Rafailovich, M.H. Compatibilizing bulk polymer blends by using organoclays. Macromolecules 2006, 39 (14), 4793-4801.
    • (2006) Macromolecules , vol.39 , Issue.14 , pp. 4793-4801
    • Si, M.1    Araki, T.2    Ade, H.3    Kilcoyne, A.L.D.4    Fisher, R.5
  • 14
    • 33646807500 scopus 로고    scopus 로고
    • The role of organically modified layered silicate in the breakup and coalescence of droplets in PBT/PE blends
    • Hong, J.S.; Namkung, H.; Ahn, K.H.; Lee, S.J.; Kim, C. The role of organically modified layered silicate in the breakup and coalescence of droplets in PBT/PE blends. Polymer 2006, 47 (11), 3967-3975.
    • (2006) Polymer , vol.47 , Issue.11 , pp. 3967-3975
    • Hong, J.S.1    Namkung, H.2    Ahn, K.H.3    Lee, S.J.4    Kim, C.5
  • 15
    • 33845910986 scopus 로고    scopus 로고
    • Melt blending of polypropylene-blend-polyamide 6-blend-organoclay systems
    • Su, Q.; Feng, M.; Zhang, S.; Jiang, J.; Yang, M. Melt blending of polypropylene-blend-polyamide 6-blend-organoclay systems. Polym. Int. 2007, 56 (1), 50-56.
    • (2007) Polym. Int , vol.56 , Issue.1 , pp. 50-56
    • Su, Q.1    Feng, M.2    Zhang, S.3    Jiang, J.4    Yang, M.5
  • 16
    • 0036461232 scopus 로고    scopus 로고
    • Effects of organoclays on morphology and thermal and rheological properties of polystyrene and poly(methyl methacrylate) blends
    • Gelfer, M.Y.; Song, H.H.; Liu, L.; Hsiao, B.S.; Chu, B.; Rafailovich, M.; Si, M.; Zaitsev, V. Effects of organoclays on morphology and thermal and rheological properties of polystyrene and poly(methyl methacrylate) blends. J. Polym. Sci. Part B: Polym. Phys. 2003,41 (1),44-54.
    • (2003) J. Polym. Sci. Part B: Polym. Phys , vol.41 , Issue.1 , pp. 44-54
    • Gelfer, M.Y.1    Song, H.H.2    Liu, L.3    Hsiao, B.S.4    Chu, B.5    Rafailovich, M.6    Si, M.7    Zaitsev, V.8
  • 17
    • 0242407166 scopus 로고    scopus 로고
    • Polymer/layered silicate nanocompo-sites: A review from preparation to processing
    • Sinha Ray, S.; Okamoto, M. Polymer/layered silicate nanocompo-sites: a review from preparation to processing. Prog. Polym. Sci. 2003,28 (11),1539-1641.
    • (2003) Prog. Polym. Sci , vol.28 , Issue.11 , pp. 1539-1641
    • Sinha Ray, S.1    Okamoto, M.2
  • 18
    • 0029777844 scopus 로고    scopus 로고
    • Polymer layered silicate nanocomposites
    • Giannelis, E.P. Polymer layered silicate nanocomposites. Adv. Mater.1996,8 (1),29-35.
    • (1996) Adv. Mater , vol.8 , Issue.1 , pp. 29-35
    • Giannelis, E.P.1
  • 19
    • 27544500640 scopus 로고    scopus 로고
    • Preparation and properties of radiation crosslinked natural rubber/ clay nanocomposites
    • Jamaliah, S.; Wan, M.Z.W.Y.; Khairul, Z.H.M.D.; Mansor, H.A. Preparation and properties of radiation crosslinked natural rubber/ clay nanocomposites. Polym. Test. 2005, 24 (2), 211-217.
    • (2005) Polym. Test , vol.24 , Issue.2 , pp. 211-217
    • Jamaliah, S.1    Wan, M.Z.W.Y.2    Khairul, Z.H.M.D.3    Mansor, H.A.4
  • 20
    • 0034217320 scopus 로고    scopus 로고
    • Synthesis and charac-terization of Na-montmorillonite-alkylammonium intercalation compounds
    • Bala, P.; Samantaraya, B.K.; Srivastava, S.K. Synthesis and charac-terization of Na-montmorillonite-alkylammonium intercalation compounds. Mater. Res. Bull. 2000, 35 (10), 1717-1724.
    • (2000) Mater. Res. Bull , vol.35 , Issue.10 , pp. 1717-1724
    • Bala, P.1    Samantaraya, B.K.2    Srivastava, S.K.3
  • 21
    • 33751112498 scopus 로고    scopus 로고
    • Modification of the surfaces of Wyoming montmorillonite by the cationic surfactants alkyl trimethyl, dialkyl dimethyl, and trialkyl methyl ammonium bromides
    • Xi, Y.; Frost, R.L.; He, H. Modification of the surfaces of Wyoming montmorillonite by the cationic surfactants alkyl trimethyl, dialkyl dimethyl, and trialkyl methyl ammonium bromides. J. Coll. Interf. Sci. 2007, 305 (1), 150-158.
    • (2007) J. Coll. Interf. Sci , vol.305 , Issue.1 , pp. 150-158
    • Xi, Y.1    Frost, R.L.2    He, H.3
  • 22
    • 0034746583 scopus 로고    scopus 로고
    • Studies on thermal and mechanical properties of polyimide-clay nanocomposites
    • Agag, T.; Koga, T.; Takeichi, T. Studies on thermal and mechanical properties of polyimide-clay nanocomposites. Polymer 2001, 42 (8), 3399-3408.
    • (2001) Polymer , vol.42 , Issue.8 , pp. 3399-3408
    • Agag, T.1    Koga, T.2    Takeichi, T.3
  • 23
    • 0034825741 scopus 로고    scopus 로고
    • Prepara-tion and properties of montmorillonite/organo-soluble polyimide hybrid materials prepared by a one-step approach
    • Huang, J.C.; Zhu, Z.K.; Ma, X.D.; Qian, X.F.; Yin, J. Prepara-tion and properties of montmorillonite/organo-soluble polyimide hybrid materials prepared by a one-step approach. J. Mater. Sci. 2001,36 (4),871-877.
    • (2001) J. Mater. Sci , vol.36 , Issue.4 , pp. 871-877
    • Huang, J.C.1    Zhu, Z.K.2    Ma, X.D.3    Qian, X.F.4    Yin, J.5
  • 25
    • 0037075670 scopus 로고    scopus 로고
    • Synthesis and characterization of nylon 1012/clay nanocomposite
    • Wu, Z.; Zhou, C.; Qi, R.; Zhang, H. Synthesis and characterization of nylon 1012/clay nanocomposite. J. Appl. Polym. Sci. 2002, 83 (11), 2403-2410.
    • (2002) J. Appl. Polym. Sci , vol.83 , Issue.11 , pp. 2403-2410
    • Wu, Z.1    Zhou, C.2    Qi, R.3    Zhang, H.4
  • 26
    • 34248211171 scopus 로고    scopus 로고
    • Morphology, Thermal and mechanical properties of poly (styrene-acrylonitrile) (SAN)/clay nanocomposites from organic-modified montmorillonite
    • Cai, Y.; Hu, Y.; Xiao, J.; Song, L.; Fan, W.; Deng, H.; Gong, X.; Chen, Z. Morphology, Thermal and mechanical properties of poly (styrene-acrylonitrile) (SAN)/clay nanocomposites from organic-modified montmorillonite. Polym. Plast. Technol. Eng. 2007, 46 (5), 541-548.
    • (2007) Polym. Plast. Technol. Eng , vol.46 , Issue.5 , pp. 541-548
    • Cai, Y.1    Hu, Y.2    Xiao, J.3    Song, L.4    Fan, W.5    Deng, H.6    Gong, X.7    Chen, Z.8
  • 27
    • 70449360184 scopus 로고    scopus 로고
    • Effect of clay types on the mechanical, dynamic mechanical and morphological properties of polypropylene nanocomposites
    • Nayak, S.K.; Mohanty, S.; Samal, S.K. Effect of clay types on the mechanical, dynamic mechanical and morphological properties of polypropylene nanocomposites. Polym. Plast. Technol. Eng. 2009, 48 (9),976-988.
    • (2009) Polym. Plast. Technol. Eng , vol.48 , Issue.9 , pp. 976-988
    • Nayak, S.K.1    Mohanty, S.2    Samal, S.K.3
  • 28
    • 33646817435 scopus 로고    scopus 로고
    • Study on structure and mech-anical properties of polyurethane/organic-montmorillonite nanocomposites
    • Wu, S.; Cheng, A.; Hua, H.; Shen, J. A study on structure and mech-anical properties of polyurethane/organic-montmorillonite nanocomposites. Polym. Plast. Technol. Eng. 2006, 45 (6), 685-689.
    • (2006) Polym. Plast. Technol. Eng , vol.45 , Issue.6 , pp. 685-689
    • Wu, S.1    Cheng, A.2    Hua, H.3    Shen, J.A.4
  • 29
    • 0030570353 scopus 로고    scopus 로고
    • Relationship between morphology and mechanical properties of binary and compatibilized ternary blends of polypropylene and nylon 6
    • Sathe, S.N.; Devi, S.; Srinivasa Rao, G.S.; Rao, K.V. Relationship between morphology and mechanical properties of binary and compatibilized ternary blends of polypropylene and nylon 6. J. Appl. Polym. Sci. 1996, 61 (1), 97-107.
    • (1996) J. Appl. Polym. Sci , vol.61 , Issue.1 , pp. 97-107
    • Sathe, S.N.1    Devi, S.2    Srinivasa Rao, G.S.3    Rao, K.V.4
  • 30
    • 0030263415 scopus 로고    scopus 로고
    • The effect of composition on morphological, thermal, and mechanical properties of polypropylene/nylon-6/polypropylene-g-butyl acrylate blends
    • Sathe, S.N.; Srinivasa Rao, G.S.; Rao, K.V.; Devi, S. The effect of composition on morphological, thermal, and mechanical properties of polypropylene/nylon-6/polypropylene-g-butyl acrylate blends. Polym. Eng. Sci. 1996, 36 (19), 2443-2450.
    • (1996) Polym. Eng. Sci , vol.36 , Issue.19 , pp. 2443-2450
    • Sathe, S.N.1    Srinivasa Rao, G.S.2    Rao, K.V.3    Devi, S.4
  • 31
    • 0034350535 scopus 로고    scopus 로고
    • Poly(propylene)/organoclay nanocomposite formation:Influence of compatibilizer functionality and organoclay modification
    • Reichert, P.; Nitz, H.; Klinke, S.; Brandsch, R.; Thomann, R.; Muhaupt, R. Poly(propylene)/organoclay nanocomposite formation:Influence of compatibilizer functionality and organoclay modification.Macromol. Mater. Eng. 2000, 275 (1), 8-17.
    • (2000) Macromol. Mater. Eng , vol.275 , Issue.1 , pp. 8-17
    • Reichert, P.1    Nitz, H.2    Klinke, S.3    Brandsch, R.4    Thomann, R.5    Muhaupt, R.6
  • 32
    • 1842684796 scopus 로고    scopus 로고
    • Prediction of the overall moduli of layered silicate-reinforced nanocomposites-part I: Basic theory and formulas
    • Wang, J.; Pyrz, R. Prediction of the overall moduli of layered silicate-reinforced nanocomposites-part I: basic theory and formulas. Compos. Sci. Technol. 2004, 64 (7-8), 925-934.
    • (2004) Compos. Sci. Technol , vol.64 , Issue.7-8 , pp. 925-934
    • Wang, J.1    Pyrz, R.2
  • 33
    • 0035970532 scopus 로고    scopus 로고
    • Reinforcement and environmental degradation of nylon-6/clay nanocomposites
    • Shelley, J.S.; Mather, P.T.; DeVries, K.L. Reinforcement and environmental degradation of nylon-6/clay nanocomposites. Polymer 2001, 42 (13),5849-5858.
    • (2001) Polymer , vol.42 , Issue.13 , pp. 5849-5858
    • Shelley, J.S.1    Mather, P.T.2    Devries, K.L.3
  • 34
    • 0033807613 scopus 로고    scopus 로고
    • Flammability properties of polymer layered-silicate nanocomposites. Polypropylene and polystyrene nanocomposites
    • Jackson, C.L.; Morgan, A.B.; Harris, R.; Manias, E.; Giannelis, E.P.; Wuthenow, M.; Hilton, D.; Phillips, S.H. Flammability properties of polymer layered-silicate nanocomposites. Polypropylene and poly-styrene nanocomposites. Chem. Mater. 2000, 12 (7), 1866-1873.
    • (2000) Chem. Mater , vol.12 , Issue.7 , pp. 1866-1873
    • Jackson, C.L.1    Morgan, A.B.2    Harris, R.3    Manias, E.4    Giannelis, E.P.5    Wuthenow, M.6    Hilton, D.7    Phillips, S.H.8
  • 35
    • 0142022835 scopus 로고    scopus 로고
    • Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate
    • Ratna, D.; Becker, O.; Krishnamurthy, R.; Simon, G.P.; Varley, R.J. Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate. Polymer 2003, 44 (24),7449-7457.
    • (2003) Polymer , vol.44 , Issue.24 , pp. 7449-7457
    • Ratna, D.1    Becker, O.2    Krishnamurthy, R.3    Simon, G.P.4    Varley, R.J.5
  • 36
    • 1842529821 scopus 로고    scopus 로고
    • Preparation and linear rheological behavior of polypropylene/MMT nanocomposites
    • Jian, L.; Zhou, C.; Gang, W.; Wei, Y.; Ying, T.; Qing, L. Preparation and linear rheological behavior of polypropylene/MMT nanocomposites. Polym. Compos. 2003, 24 (3), 323-331.
    • (2003) Polym. Compos , vol.24 , Issue.3 , pp. 323-331
    • Jian, L.1    Zhou, C.2    Gang, W.3    Wei, Y.4    Ying, T.5    Qing, L.6
  • 38
    • 0033779495 scopus 로고    scopus 로고
    • Polymer-clay nanocomposites: Exfoliation of organophilic montmorillonite nanolayers in polystyrene
    • Fu, X.; Qutubuddin, S. Polymer-clay nanocomposites: exfoliation of organophilic montmorillonite nanolayers in polystyrene. Polymer 2001,42 (2),807-813.
    • (2001) Polymer , vol.42 , Issue.2 , pp. 807-813
    • Fu, X.1    Qutubuddin, S.2
  • 39
    • 13244299359 scopus 로고    scopus 로고
    • Effect of maleic anhydride-grafted ethylene-propylene rubber on the mechanical, rheological and morphological properties of organoclay reinforced polyamide 6/polypropylene nanocompo-sites
    • Chow, W.S.; Abu Bakar, A.; Mohd Ishak, Z.A.; Karger-Kocsis, J.; Ishiaku, U.S. Effect of maleic anhydride-grafted ethylene-propylene rubber on the mechanical, rheological and morphological properties of organoclay reinforced polyamide 6/polypropylene nanocomposites. Eur. Polym. J. 2005, 41 (4), 687-696.
    • (2005) Eur. Polym. J , vol.41 , Issue.4 , pp. 687-696
    • Chow, W.S.1    Abu Bakar, A.2    Mohd Ishak, Z.A.3    Karger-Kocsis, J.4    Ishiaku, U.S.5
  • 40
    • 0344896675 scopus 로고    scopus 로고
    • Copolyester/layered silicate nano-composites: The effect of the molecular size and molecular structure of the intercalant on the structure and viscoelastic properties of the nanocomposites
    • Kalgaonkar, R.A.; Jog, J.P. Copolyester/layered silicate nano-composites: The effect of the molecular size and molecular structure of the intercalant on the structure and viscoelastic properties of the nanocomposites. J. Polym. Sci. Pt. B: Polym. Phys. 2003, 41 (23), 3102-3113.
    • (2003) J. Polym. Sci. Pt. B: Polym. Phys , vol.41 , Issue.23 , pp. 3102-3113
    • Kalgaonkar, R.A.1    Jog, J.P.2
  • 41
    • 0042324249 scopus 로고    scopus 로고
    • Preparation and characterization of epoxy-cyanate ester interpenetrating network matrices/organoclay nanocomposites
    • Dinakaran, K.; Alagar, M. Preparation and characterization of epoxy-cyanate ester interpenetrating network matrices/organoclay nanocomposites. Polym. Adv. Technol. 2003, 14 (8), 574-585.
    • (2003) Polym. Adv. Technol , vol.14 , Issue.8 , pp. 574-585
    • Dinakaran, K.1    Alagar, M.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.