STEREOCOMPLEX FORMATION IN ABA TRIBLOCK COPOLYMERS OF POLY(LACTIDE)(A) AND POLY(ETHYLENE-GLYCOL)(B)

被引:76
|
作者
STEVELS, WM
ANKONE, MJK
DIJKSTRA, PJ
FEIJEN, J
机构
[1] Department of Chemical Technology, University of Twente, Enschede, 7500 AE
关键词
D O I
10.1002/macp.1995.021961121
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Two series of triblock copolymers of poly(ethylene glycol) (PEG, number-average molecular weight (M) over bar(n) = 6 000) and poly(L-lactide) (PLLA) or poly(D-lactide) (PDLA) were prepared by ring-opening polymerization of lactide initiated by PEG end groups using stannous octoate as a catalyst, either in refluxing toluene or in the melt at 175 degrees C. The weight percentage of PLA in the polymers varied between 15 and 75 wt.-%. Blends of polymers containing blocks of opposite chirality were prepared by co-precipitation from homogeneous solutions. The melting temperatures of the crystalline PEG and PLA phases strongly depended on the composition of the polymers. The melting temperature of the PLA phase in the blends was approximately 40 degrees C higher than that of the single block copolymers. Stereocomplex formation between blocks of enantiomeric poly(lactides) in PEG/PLA block copolymers was established for the first time. Water uptake of polymeric films prepared by solution casting was solely determined by the PEG content of the film.
引用
收藏
页码:3687 / 3694
页数:8
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