期刊
MACROMOLECULES
卷 46, 期 10, 页码 3965-3974出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma400522n
关键词
-
资金
- NSERC [EGP 434440-12]
- NSERC [EGP 434440-12]
The dinuclear indium catalyst [(NNO)InCl](2)(mu-OEt)(mu-Cl), previously reported to be highly active for the living ring-opening polymerization of cyclic esters lactide (LA) and beta-butyrolactone (BBL), was used to generate a series of triblock copolymers of poly(lactic acid) (PLA) and poly(hydroxybutyrate) (PHB). Copolymers PLLA-PDLLA-PLLA and PLLA-PDLLA-PDLA, synthesized via sequential monomer addition, showed low molecular weight distributions and excellent correlation between the calculated and experiment molecular weights. Significantly, triblock copolymers of the type PLA PHB PLA were also synthesized for the first time through a sequential addition technique. Analysis of polymers after each addition of monomer showed that although only 85% conversion was achieved after addition of BBL, the remaining chain ends were active and addition of more lactide yielded a triblock. Rheological studies of PLLA-PHB-PDLA indicated solid like behavior even well above the temperature at which stereocomplex formation was observed These elastomeric triblocks exhibited elongations at break 5-10 times greater than those of corresponding PLLA-PDLLA-PLDA triblocks.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据