Cited by 59Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesBlock Copolymer Self-Assembly

Stereocomplex formation between poly(L‐lactic acid) and poly(D‐lactic acid) with disproportionately low and high molecular weights from the melt

Tsuji, Hideto, Bouapao, Leevameng·2012·Polymer International

Abstract

Poly( L ‐lactic acid) (PLLA) and poly( D ‐lactic acid) (PDLA) with very different weight‐average molecular weights ( M w ) of 4.0 × 10 3 and 7.0 × 10 5 g mol −1 ( M w (PDLA)/ M w (PLLA) = 175) were blended at different PDLA weight ratios ( X D = PDLA weight/blend weight) and their crystallization from the melt was investigated. The presence of low molecular weight PLLA facilitated the stereocomplexation and thereby lowered the cold crystallization temperature ( T cc ) for non‐isothermal crystallization during heating and elevated the radial growth rate of spherulites ( G ) for isothermal crystallization, irrespective of X D . The orientation of lamellae in the spherulites was higher for the neat PLLA, PDLA and an equimolar blend than for the non‐equimolar blends. It was found that the orientation of lamellae in the blends was maintained by the stereocomplex (SC) crystallites. Although the G values are expected to decrease with an increase in X D or the content of high‐molecular‐weight PDLA with lower chain mobility compared with that of low‐molecular‐weight PLLA, G was highest at X D = 0.5 where the maximum amount of SC crystallites was formed and the G values were very similar for X D = 0.4 and X D = 0.6 with the same enantiomeric excess. This means that the effect of SC crystallites overwhelmed that of chain mobility. The nucleating mechanisms of SC crystallites were identical for X D = 0.1–0.5 in the T c range 130–180 °C. Copyright © 2011 Society of Chemical Industry

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Crossref · 10.1002/pi.3219

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Authors
Tsuji, H., & Bouapao, L.
Affiliations
Toyohashi University of Technology (JP)
Corresponding author
Tsuji, Hideto
Venue
Polymer International
Publisher
Wiley
Published
2011-12-16
Volume
61
Issue
3
Pages
442-450
ISSN
  • 0959-8103 (ISSN-L)
  • 1097-0126
OpenAlex
W1970375389
Cited by
59
References
48
Citations by year
2025: 3 · 2024: 4 · 2023: 6 · 2022: 3 · 2021: 5 · 2020: 9 · 2019: 1 · 2018: 6 · 2017: 2 · 2016: 8 · 2015: 5 · 2014: 2 · 2013: 3 · 2012: 2
FWCI
1.91
Type
journal article
Language
en
Open access
closed
Locations
Polymer International (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
Keywords
stereocomplex formation, poly(L-lactic acid), poly(D-lactide), polymer blends, molecular weight effects, cold crystallization, spherulite growth rate, lamellar orientation, nucleation mechanism, chain mobility, enantiomeric excess

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