2010
DOI: 10.1021/am1005755
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Stereo-Complex Crystallization of Poly(lactic acid)s in Block-Copolymer Phase Separation

Abstract: Block-copolymer containing a poly(L-lactic acid) (PLLA) segment was blended with pure poly(D-lactic acid) (PDLA) chain in chloroform solution and casted into the dried film. This method could form the stereocomplex (Sc) crystal of PLLA/PDLA within the nanometer-sized phase separation self-assembled by block-copolymer. Differential scanning calorimetry measurements of the prepared and annealed films gave the maximum achievable melting temperature of 245 °C, which was highest among those previously reported for … Show more

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Cited by 47 publications
(43 citation statements)
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“…The former modification melts at a higher temperature ( T m = ≈170 °C) than the latter ( T m = ≈155 °C). The stereocomplex of polylactide (PLA) formed in the blend of poly( l ‐lactide) (PLLA) and poly( d ‐lactide) (PDLA) possesses a 50 °C higher melting temperature ( T m = ≈230 °C) than the homochiral (or isochiral) crystal PLLA or PDLA ( T m = ≈180 °C) . One can find a striking concordance when comparing α ‐iPP and β ‐iPP to the stereocomplex of PLLA/PDLA blend and the homopolymers PLLA or PDLA, respectively.…”
Section: Introductionmentioning
confidence: 96%
“…The former modification melts at a higher temperature ( T m = ≈170 °C) than the latter ( T m = ≈155 °C). The stereocomplex of polylactide (PLA) formed in the blend of poly( l ‐lactide) (PLLA) and poly( d ‐lactide) (PDLA) possesses a 50 °C higher melting temperature ( T m = ≈230 °C) than the homochiral (or isochiral) crystal PLLA or PDLA ( T m = ≈180 °C) . One can find a striking concordance when comparing α ‐iPP and β ‐iPP to the stereocomplex of PLLA/PDLA blend and the homopolymers PLLA or PDLA, respectively.…”
Section: Introductionmentioning
confidence: 96%
“…The dual peaks gradually transferred to single melting peak with shear rate increasing. Generally, such a phenomenon can be explained by three main mechanisms, namely, melting‐recrystallization, dual lamellae population, and dual crystal structure . Here, the phenomenon should be attributed to the melting‐recrystallization of SC.…”
Section: Resultsmentioning
confidence: 99%
“…So to simultaneously increase thermal stability and toughness of PL, the copolymers of its enantiomeric segments are adopted for stereocomplexation. Among the successful literatures reported [7,[18][19][20][21][22][23][24][25][26], the copolymers of poly(ethylene glycol) (PEG) and PDL, when blending with PLL, were shown to provide good balance between crystallinity and toughness due to the plasticizing effect of the former and the specific affinity toward stereocomplexation of the latter [7,18,23,24].…”
Section: Introductionmentioning
confidence: 99%