Effect of Star-shaped Chain Architectures on the Polylactide Stereocomplex Crystallization Behaviors

Linear and star-shaped polylactides（PLA） with similar molecular weights of each arm are synthesized via ringopening polymerization of LA with 3-butyn-1-ol and pentaerythritol as initiators,respectively.By solution blending of equivalent mass of poly（L-lactic acid）s（PLLAs） and poly（D-lactic acid）s（PD...

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Bibliographic Details
Published in:Chinese journal of polymer science 2017-08, Vol.35 (8), p.974-991
Main Authors: Zhou, Ke-yu, Li, Jian-bo, Wang, Han-xuan, Ren, Jie
Format: Article
Language:English
Subjects:
Acetal resins
Biodegradable materials
Chain mobility
Chains (polymeric)
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Crystallinity
Crystallization
FTIR分析
Industrial Chemistry/Chemical Engineering
Initiators
Nucleation
PLLA
Polylactic acid
Polymer Sciences
Ring opening polymerization
Solution blending
Stereocomplexes
复合物
季戊四醇
星形
结晶行为
聚乳酸
链结构
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Summary:Linear and star-shaped polylactides（PLA） with similar molecular weights of each arm are synthesized via ringopening polymerization of LA with 3-butyn-1-ol and pentaerythritol as initiators,respectively.By solution blending of equivalent mass of poly（L-lactic acid）s（PLLAs） and poly（D-lactic acid）s（PDLAs）,perfect PLA stereocomplexes（sc PLAs） are prepared and confirmed by WAXD and FTIR analysis.Effect of chain architectures on stereocomplex crystallization is investigated by studying the non-isothermal and isothermal crystallization of linear and star-shaped polylactide stereocomplexes.In dynamic DSC and POM test,star-shaped PLLA（4s PLLA）/PDLA and PLLA/star-shaped PDLA（4s PDLA） stereocomplexes reach rapid crystallization and higher crystallinity due to larger spherulite density of star-shaped chain and excellent chain mobility of linear chain.In isothermal crystallization test,much faster crystallization and less crystallization half-time is obtained with the increase of star-shaped chain.Meanwhile,4s PLLA/PDLA and PLLA/4s PDLA are found to have the highest crystallinity,suggesting limitation of too much star-shaped chain for 4s PLLA/4s PDLA and restriction of linear chain in nucleation capacity for PLLA/PDLA.The results reveal that star-shaped chain has an important influence on the crystallization of sc PLAs.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-017-1935-4