Enhanced stereocomplex formation of poly(L-lactic acid) and poly(D-lactic acid) in the presence of stereoblock poly(lactic acid)
Enhanced stereocomplex formation of poly(L-lactic acid) and poly(D-lactic acid) in the presence of stereoblock poly(lactic acid)
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DOI：
10.1002/mabi.200700028
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发表时间：
2007-06-07
影响因子：
4.6
通讯作者：
Kimura, Yoshiharu
中科院分区：
文献类型：
--
作者：
Fukushima, Kazuki;Chang, Yoon-Hee;Kimura, Yoshiharu
将立构嵌段聚乳酸（sb-PLA）加入到高分子量聚L-乳酸（PLLA）和聚D-乳酸（PDLA）的1：1共混体系中，研究了sb-PLA对PLLA和PDLA形成立构复合物的加成作用。三元聚合物共混膜首先通过浇铸具有不同组成的sb-PLA、PLLA和PDLA的聚合物溶液来制备。随着sb-PLA含量的增加，共混膜中的sc结晶被驱动到更高的程度，而纯手性（hc）晶体的形成减少。降低掺入的sb-PLA的分子量有效地增加了sc的形成。因此，它表明，sb-PLA可以作为一个增容剂，以改善穷人的SC形成在聚合物共混物的PLLA和PDLA。
Stereoblock poly(lactic acid) (sb-PLA) is incorporated into a 1:1 polymer blend system of poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) that has a high molecular weight to study its addition effect on the stereocomplex (sc) formation of PLLA and PDLA. The ternary polymer blend films are first prepared by casting polymer solutions of sb-PLA, PLLA, and PDLA with different compositions. Upon increasing the content of sb-PLA in the blend films the sc crystallization is driven to a higher degree, while the formation of homo-chiral (hc) crystals is decreased. Lowering the molecular weight of the incorporated sb-PLA effectively increases the sc formation. Consequently, it is revealed that sb-PLA can work as a compatibilizer to improve the poor sc formation in the polymer blend of PLLA and PDLA.