Crystallization Behavior of Asymmetric PLLA/PDLA Blends

被引：108
作者：
Sun, Jingru [1 ]
Yu, Haiyang [1 ]
Zhuang, Xiuli [1 ]
Chen, Xuesi [1 ]
Jing, Xiabin [2 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Polymer Ecomat, Changchun 130022, Peoples R China
[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2011年 / 115卷 / 12期
基金：
中国国家自然科学基金;
关键词：
ENANTIOMERIC POLY(LACTIC ACID)S; STEREOCOMPLEX FORMATION; POLY(L-LACTIC ACID); POLY(L-LACTIDE)/POLY(D-LACTIDE) STEREOCOMPLEX; POLYLACTIDE STEREOCOMPLEX; POLY(D-LACTIC ACID); SPHERULITE GROWTH; CRYSTAL-STRUCTURE; THERMAL-PROPERTY; MELT;
D O I：
10.1021/jp111894m
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of the addition of poly(D-lactide) (PDLA) on the crystallization behavior of poly(L-lactide) (PLLA) were investigated by means of differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction(XRD). When the blends were cooled from different temperatures (250, 240, and 190 degrees C) at the rate of cooling of 5 degrees C/min, stereocomplex (sc) crystallites could stay at diverse states. Accordingly, the stereocomplexes acted as a nucleation agent exerting distinct effects on PLLA crystallization. The speculated mechanisms of the stereocomplex formation and the effectiveness as a nucleating agent are schematically described. Moreover, temperature-dependent XRD was carried out to further :investigate the melt-crystallization behavior of PLLA/PDLA blends in real time. Temperature-dependent XRD results indicated that even at 240 degrees C the stereocomplex crystallites in all blend samples. existed clearly, which could not be detected by DSC. These XRD results further suggest that the onset T-c values for the PLLA alpha-form crystals formation were 160, 120, 140, and 160 degrees C, respectively, for neat PLLA, PLLA/PDLA 95/5, 90/10, and 80/20 as well as 70/30 samples.
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页码：2864 / 2869
页数：6
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