Citation: Ke-yu Zhou, Jian-bo Li, Han-xuan Wang, Jie Ren. Effect of Star-shaped Chain Architectures on the Polylactide Stereocomplex Crystallization Behaviors[J]. Chinese Journal of Polymer Science, ;2017, 35(8): 974-991. doi: 10.1007/s10118-017-1935-4 shu

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

Ke-yu Zhou ^a,b ,
Jian-bo Li ^a,, ,
Han-xuan Wang ^b ,
Jie Ren ^a,b,,

a.
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
b.
Institute of Nano and Bio-Polymeric Materials, School of Material Science and Engineering, Tongji University, Shanghai 201804, China

Corresponding author: Jian-bo Li, lijianbo@tongji.edu.cn Jie Ren, renjie6598@163.com
Received Date: 19 December 2016
Revised Date: 16 January 2017
Accepted Date: 23 January 2017

Fund Project: the National Natural Science Foundation of China 51203118the National High-Tech R & D Program of China 2013AA032202

Linear and star-shaped polylactides (PLA) with similar molecular weights of each arm are synthesized via ring-opening 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 (scPLAs) 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 (4sPLLA)/PDLA and PLLA/star-shaped PDLA (4sPDLA) 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, 4sPLLA/PDLA and PLLA/4sPDLA are found to have the highest crystallinity, suggesting limitation of too much star-shaped chain for 4sPLLA/4sPDLA 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 scPLAs.
- Polylactic acid,
- Stereocomplex,
- Linear,
- Star-shaped,
- Crystallization
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com