Stereocomplex Crystallization and Spherulite Growth of Low Molecular Weight Poly(L-lactide) and Poly(D-lactide) from the Melt
Stereocomplex Crystallization and Spherulite Growth of Low Molecular Weight Poly(L-lactide) and Poly(D-lactide) from the Melt
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DOI：
10.1002/macp.200900017
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发表时间：
2009-06-17
影响因子：
2.5
通讯作者：
Tsuji, Hideto
中科院分区：
文献类型：
--
作者：
Bouapao, Leevameng;Tsuji, Hideto
在熔体等温结晶过程中，当结晶温度高于130℃时，所有共混物均形成立体配合物晶体，球晶生长速率和结晶度随PDLA含量偏离50而单调降低。令人惊讶的是，制度分析表明共混物的结晶机制与PDLA含量无关。在加热过程中熔融淬火试样的非等温结晶中，与纯PLLA和纯PDLA相比，共混物的冷结晶在较低的温度下迅速发生。这是由于熔融或二次加热淬火过程中形成的立体络合物的快速结晶或成核作用。
In isothermal crystallization from the melt, only stereocomplex crystallites as a crystalline species were formed in all the blends at crystallization temperature above 130 degrees C. The spherulite growth rate and crystallinity values decreased monotonically with deviation of the PDLA content from 50. Surprisingly regime analysis revealed that the crystallization mechanism of the blends was independent of PDLA content. In non-isothermal crystallization of melt-quenched specimens during heating, the cold crystallization of blends takes place rapidly at a lower temperature compared to that of pure PLLA and PDLA. This is attributable to the rapid stereocomplex crystallization or the nucleating effect of stereocomplex crystallites formed during quenching from the melt or second heating.