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Volumn 3, Issue 5, 2010, Pages 579-590

One-pot synthesis of lactide-styrene diblock copolymers via catalytic immortal ring-opening polymerization of lactide and nitroxide-mediated polymerization of styrene

Author keywords

Binary catalysis; Block copolymers; Polymers; Ring opening polymerization; Zinc

Indexed keywords

BINS; BIOCOMPATIBILITY; BIODEGRADABLE POLYMERS; BIOGRAPHIES; BIOLOGICAL MATERIALS; BLOCK COPOLYMERS; CATALYSTS; POLYMERIZATION; POLYMERS; STYRENE; ZINC;

EID: 77954784242     PISSN: 18645631     EISSN: 1864564X     Source Type: Journal    
DOI: 10.1002/cssc.201000021     Document Type: Article
Times cited : (21)

References (85)
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    • For reviews on the development of discrete metal-based initiators for the ROP of LA, see for example
    • For reviews on the development of discrete metal-based initiators for the ROP of LA, see for example: B. J. O'Keefe, M. A. Hillmyer, W. B. Tolman, J. Chem. Soc., Dalton Trans. 2001, 2215-2224.
    • (2001) J. Chem. Soc., Dalton Trans. , pp. 2215-2224
    • O'Keefe, B.J.1    Hillmyer, M.A.2    Tolman, W.B.3
  • 36
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    • When initially comparing a simple polyolefin and a related (multi)block copolymer of identical length with a small content of biodegradable polyester, the degradation of the bioresourced segment in the copolymer eventually yielded polyolefin fragments of much smaller size and different morphologies than the simple homopolymer
    • When initially comparing a simple polyolefin and a related (multi)block copolymer of identical length with a small content of biodegradable polyester, the degradation of the bioresourced segment in the copolymer eventually yielded polyolefin fragments of much smaller size and different morphologies than the simple homopolymer: G. Swift, R. Baciu, Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 2007, 48, 586-587.
    • (2007) Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem. ) , vol.48 , pp. 586-587
    • Swift, G.1    Baciu, R.2
  • 40
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    • For the preparation of copolymers of styrene and lactide and their arrangement into original microstructures, see for instance
    • For the preparation of copolymers of styrene and lactide and their arrangement into original microstructures, see for instance: W.-H. Tseng, P.-Y. Hsieh, R.M. Ho, B.-H. Huang, C.-C. Lin, B. Lotz, Macromolecules 2006, 39, 7071-7077.
    • (2006) Macromolecules , vol.39 , pp. 7071-7077
    • Tseng, W.-H.1    Hsieh, P.-Y.2    Ho, R.M.3    Huang, B.-H.4    Lin, C.-C.5    Lotz, B.6
  • 44
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    • Others methodologies include: the reverse sequence, that is, the preparation of an end-functionalized PS macroinitiator by ATRP for the subsequent ROP of LA, see for instance ref. [19c] or the post-polymerization modification of functionalized polystyrene followed by ROP of LA: see Ref. [20d]
    • Others methodologies include: the reverse sequence, that is, the preparation of an end-functionalized PS macroinitiator by ATRP for the subsequent ROP of LA, see for instance ref. [19c] or: A. Likhitsup, A. Parthiban, C. L. L. Chai, J. Polym. Sci. Part A 2008, 46, 102-116; the post-polymerization modification of functionalized polystyrene followed by ROP of LA: see Ref. [20d].
    • (2008) J. Polym. Sci. Part A , vol.46 , pp. 102-116
    • Likhitsup, A.1    Parthiban, A.2    Chai, C.L.L.3
  • 57
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    • TEMPO-OH and hydroxyl-functionalized alkoxyamines were also used to prepare diblock copolymers of e-caprolactone with styrene or 4-vinylpyridine following the same methodologies
    • TEMPO-OH and hydroxyl-functionalized alkoxyamines were also used to prepare diblock copolymers of e-caprolactone with styrene or 4-vinylpyridine following the same methodologies: E. Yoshida, Y. Osagawa, Macromolecules 1998, 31, 1446-1456.
    • (1998) Macromolecules , vol.31 , pp. 1446-1456
    • Yoshida, E.1    Osagawa, Y.2
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    • The probability of a meso enchainment for two consecutive chiral centers was determined by examination of the methine region in the 1H homonuclear decoupled NMR spectrum of PLA samples according to Ref. [5] and
    • The probability of a meso enchainment for two consecutive chiral centers was determined by examination of the methine region in the 1H homonuclear decoupled NMR spectrum of PLA samples according to Ref. [5] and M. H. Chisholm, S. S. Iyer, M. E. Matison, Chem. Commun. 1997, 1999-2000.
    • (1997) Chem. Commun. , pp. 1999-2000
    • Chisholm, M.H.1    Iyer, S.S.2    Matison, M.E.3
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    • The largest discrepancy between calculated and experimental Mn was that obtained with [5]/[TEMPO-OH]=1:1 (Table 3, entry 9), which can tentatively be explained by the fact that the Mark-Houwink factor of 0.58 commonly used for the determination of molecular weights of PLLA samples by size exclusion chromatography (SEby using polystyrene standards is erroneous for materials of such length. See
    • The largest discrepancy between calculated and experimental Mn was that obtained with [5]/[TEMPO-OH]=1:1 (Table 3, entry 9), which can tentatively be explained by the fact that the Mark-Houwink factor of 0.58 commonly used for the determination of molecular weights of PLLA samples by size exclusion chromatography (SEby using polystyrene standards is erroneous for materials of such length. See: M. Save, M. Schappacher, A. Soum, Macromol. Chem. Phys. 2002, 203, 889-899.
    • (2002) Macromol. Chem. Phys. , vol.203 , pp. 889-899
    • Save, M.1    Schappacher, M.2    Soum, A.3
  • 81
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    • The short induction periods, better observed at 80°C and 100°C, can be accounted for by the time necessary so that a significant fraction of the monomer had dissolved in styrene, due to the experimental procedure we used. Under these experimental conditions, that is, [l-LA]0= 2.0m and [l-LA]/[5]/[TEMPO-OH]=1000:1:10, complete dissolution of the monomer was typically ensured after 1-2 min at temperatures of 80-100 °C. The polymers remained fully soluble at these temperatures, even at full conversion of the monomer
    • The short induction periods, better observed at 80°C and 100°C, can be accounted for by the time necessary so that a significant fraction of the monomer had dissolved in styrene, due to the experimental procedure we used. Under these experimental conditions, that is, [l-LA]0= 2.0m and [l-LA]/[5]/[TEMPO-OH]=1000:1:10, complete dissolution of the monomer was typically ensured after 1-2 min at temperatures of 80-100 °C. The polymers remained fully soluble at these temperatures, even at full conversion of the monomer.
  • 82
    • 0000651347 scopus 로고    scopus 로고
    • We have shown that the thermally self-initiated homopolymerization of styrene only takes place to a noticeable extent at 105°C (or morafter several hours of reaction time and yields amorphous atactic PS
    • We have shown that the thermally self-initiated homopolymerization of styrene only takes place to a noticeable extent at 105°C (or morafter several hours of reaction time and yields amorphous atactic PS: S. Bogaert, J.-F. Carpentier, T. Chenal, A. Mortreux, G. Ricart, Macromol. Chem. Phys. 2000, 201, 1813-1822.
    • (2000) Macromol. Chem. Phys. , vol.201 , pp. 1813-1822
    • Bogaert, S.1    Carpentier, J.-F.2    Chenal, T.3    Mortreux, A.4    Ricart, G.5
  • 83
    • 85020980700 scopus 로고    scopus 로고
    • The small discrepancies between observed and calculated molecular weights (notably for DP=24) are due to the automatic peak peaking, which is not able to detect systematically the main peak in a given isotopic distribution. This default of our software could unfortunately not be circumvented
    • The small discrepancies between observed and calculated molecular weights (notably for DP=24) are due to the automatic peak peaking, which is not able to detect systematically the main peak in a given isotopic distribution. This default of our software could unfortunately not be circumvented.
  • 84
    • 85021007534 scopus 로고    scopus 로고
    • As the hydrodynamic volume of a PLLA-block-PS in solution most likely lies in between those of the corresponding PLLA and PS homopolymers, the Mark-Houwink factor of 0.58 normally used for the determination of the molecular weight of PLA samples (Ref. [37]), was not applied to the calculation of the molecular weight of the final diblock copolymer
    • As the hydrodynamic volume of a PLLA-block-PS in solution most likely lies in between those of the corresponding PLLA and PS homopolymers, the Mark-Houwink factor of 0.58 normally used for the determination of the molecular weight of PLA samples (Ref. [37]), was not applied to the calculation of the molecular weight of the final diblock copolymer.
  • 85
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    • NMR spectroscopy and SEC characterization of these copolymers are given in the Supporting Information
    • NMR spectroscopy and SEC characterization of these copolymers are given in the Supporting Information


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