PLLA/PDLA立构复合晶体的结晶、熔融行为  

Crystallization and Melting Behavior of PLLA/PDLA Stereocomplex Crystal

作　　者：石文鹏 王晓琴 钱岑 SHI Wen-peng;WANG Xiao-qin;QIAN Cen(Changzhou Institute of Industry Technology,Changzhou 213164,China)

机构地区：[1]常州工业职业技术学院,常州213164

出　　处：《高分子通报》2019年第12期41-47,共7页Polymer Bulletin

基　　金：国家自然科学基金(51373041)。

摘　　要：以水为引发剂合成了两种构型不同的左旋聚乳酸和右旋聚乳酸,运用DSC研究了分子量较低的PLLA/PDLA立构复合聚乳酸晶体的多重熔融行为,观察到随着180℃等温时间的增加,PLLA/PDLA共混物的立构复合晶体的熔点和熔融峰面积呈现震荡性变化行为,进一步的DSC和在线X射线研究结果显示,聚乳酸立构复合晶体多重熔融峰的震荡行为来自于晶体中就近生长的过量异构体链段的调整过程。Two different stereoregular polylactides,poly(L-lactide)(PLLA)and poly(D-lactide)(PDLA)were synthesized using water as co-initiator.The double melting behavior of PLLA/PDLA stereocomplex crystal(Sc-crystal)was studied with DSC and in situ X-ray measurements.The oscillation phenomenon of melting peak area and melting point was discovered and investigated with the increase of isothermal time at 180℃.Through DSC and situ X-ray measurements,it is found that driving force of the oscillation in melting peak area is the instability of the massive isomers in the PLLA/PDLA Sc-crystal,which comes from the adjacent folding mechanism of crystal growth.

关 键 词：左旋聚乳酸/右旋聚乳酸 立构复合晶体 震荡性行为 片晶 晶体生长 

分 类 号：O63[理学—高分子化学]