Reactive Compatibilization of Poly(L-lactide) and Conjugated Soybean Oil
Reactive Compatibilization of Poly(L-lactide) and Conjugated Soybean Oil
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DOI：
10.1021/ma902449x
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发表时间：
2010-03-09
期刊：
影响因子：
5.5
通讯作者：
Hillmyer, Marc A.
中科院分区：
文献类型：
--
作者：
Gramlich, William M.;Robertson, Megan L.;Hillmyer, Marc A.
以N-2-羟乙基马来酰亚胺（HEM 1）为引发剂，2-乙基己酸锡（II）为催化剂，通过开环本体聚合法制备了末端官能化的聚（L-丙交酯）（HEMI-PLLA）。制备了HEMI-PLLA和共轭大豆油（CS）的熔融共混物。HEMI-PLLA与CS发生Diels-Alder反应，转化率高，偶联了两种不混溶的组分。多达三个HEMI-PI-LA分子与一个CS分子反应以产生具有不同结构的产品，其充当熔融共混物的增容剂。与PLLA均聚物相比，HEMI-PLLA和5重量% CS的共混物导致断裂伸长率增加大于17倍，并且与具有非反应性PLLA的5重量% CS共混物相比，断裂伸长率增加超过一倍。共混物的形态分析表明，原位形成的相容剂降低了CS液滴直径相比，非反应性的二元共混物和最佳的液滴直径存在增韧PLLA与CS。
Ring-opening bulk polymerization Oft-lactide using N-2-hydroxyethylmaleimide (HEM1) as the initiator and tin(II) 2-ethylhexanoate as the catalyst produced a reactive end-functionalized poly(L-lactide) (HEMI-PLLA). Melt blends of HEMI-PLLA and conjugated soybean oil (CS) were prepared. HEMI-PLLA underwent a Diels-Alder reaction with the CS to high conversion, coupling the two immiscible components. Up to three HEMI-PI-LA molecules reacted with one CS molecule to create products with varying architecture that acted as compatibilizers for the melt blend. Blends of HEMI-PLLA and 5 wt % CS resulted in a greater than 17-fold increase in elongation to break compared to PLLA homopolymer and more than doubled the elongation to break compared to a 5 wt % CS blend with unreactive PLLA. Analysis of the blend morphology indicated that the in situ formation of the compatibilizer decreased the CS droplet diameter compared to unreactive binary blends and that an optimum droplet diameter exists for toughening PLLA with CS.