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Volumn 50, Issue 12, 2012, Pages 813-823

Polymers coalesced from their cyclodextrin inclusion complexes: What can they tell us about the morphology of melt-crystallized polymers?

Author keywords

cyclodextrin; inclusion chemistry; morphology; solid state structure; thermal stability

Indexed keywords

CAPROLACTONE; CDS; CRYSTALLINE REGIONS; ENTANGLEMENT NETWORKS; HIGHER TEMPERATURES; HYDROPHOBIC CAVITIES; HYDROXYL GROUPS; INCLUSION CHEMISTRY; INCLUSION COMPLEX; INCLUSION COMPOUNDS; NANO-SIZE; NYLON-6; POLY L LACTIC ACID; POLYETHYLENE CHAINS; POLYMER CHAINS; RAPID TRANSFORMATIONS; SEMICRYSTALLINES; SOLID-STATE STRUCTURES; SOLUTION-CAST; SPECTRA FIBERS; ULTRA-HIGH MOLECULAR WEIGHT; WATERSOLUBLE;

EID: 84860801323     PISSN: 08876266     EISSN: 10990488     Source Type: Journal    
DOI: 10.1002/polb.23074     Document Type: Review
Times cited : (24)

References (32)
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    • for a discussion of Vectra, a liquid-crystalline ester/arylate copolymer, that evidences a macroscopically anisotropic melt, much like that suggested above locally for coalesced polymers
    • See, D. E. Beers,;, J. E. Ramirez, J. Text., Inst., 81, 561-574, 1990 for a discussion of Vectra, a liquid-crystalline ester/arylate copolymer, that evidences a macroscopically anisotropic melt, much like that suggested above locally for coalesced polymers.
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    • Beers, D.E.1    Ramirez, J.E.2
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    • Rastogi, S.,;, Lippits, D. R.,;, Peters, G. W. M., Graf, R.,;, Yao, Y.,;, Spiess, H. W.,; Nat. Mater. 2005, 4, 635-641 Quoting Rastogi et al. ".crystals composed of single chains are feasible, where the chains are fully separated from each other. If such separation can be maintained in the melt a new melt state can be formed. Here, we show that through slow and carefully controlled melting such polymer crystals form a heterogeneous melt with more entangled regions, where the chains are mixed, and less entangled ones, composed of individually separated chains. Chain reptation, required for the homogenization of the entanglement distribution, is found to be considerably hindered. The long-lived heterogeneous melt shows decreased melt viscosity and provides enhanced drawability on crystallization." In contrast, the usual morphology of semicrystalline polymers with intimately mixed chains, as illustrated by the central drawing in Figure 5, is rapidly converted on heating into a homogeneous entangled melt of randomly coiling chains. Chain reptation is required to produce homogeneous melts from both semicrystalline morphologies. However, in the case of the slow heating of metallocene-catalyzed UHMW-PE nascent single-chain crystals, the initial rapid entanglements formed between portions of PE chains melting and detaching from the ends of different single-crystals serve to retard the further entanglement of the central portions of the PE chains, leading to a heterogeneous melt whose ultimate homogenization is thus retarded.
    • (2005) Nat. Mater. , vol.4 , pp. 635-641
    • Rastogi, S.1    Lippits, D.R.2    Peters, G.W.M.3    Graf, R.4    Yao, Y.5    Spiess, H.W.6
  • 27
    • 84860828566 scopus 로고    scopus 로고
    • gs observed for the unincluded portions of amorphous chains "dangling" above the surfaces of their CD-IC crystals are considerably elevated. This supports the observations that in the noncrystalline regions and melts of coalesced polymers the densities of chains are higher and they are likely not significantly entangled
    • gs observed for the unincluded portions of amorphous chains "dangling" above the surfaces of their CD-IC crystals are considerably elevated. This supports the observations that in the noncrystalline regions and melts of coalesced polymers the densities of chains are higher and they are likely not significantly entangled.
    • (2012) Polymer , vol.52
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  • 29
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.