Reactive functionalization of poly(lactic acid), PLA: Effects of the reactive modifier, initiator and processing conditions on the final grafted maleic anhydride content and molecular weight of PLA
Reactive functionalization of poly(lactic acid), PLA: Effects of the reactive modifier, initiator and processing conditions on the final grafted maleic anhydride content and molecular weight of PLA
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DOI：
10.1016/j.polymdegradstab.2013.10.001
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发表时间：
2013-12-01
影响因子：
5.9
通讯作者：
Auras, Rafael
中科院分区：
文献类型：
--
作者：
Detyothin, Sukeewan;Selke, Susan E. M.;Auras, Rafael
采用响应面法（RSM）设计，分析了马来酸酐（MA）和2，5-双（2-甲基-2-苯基）-2-（4-甲基-2-苯基）-2-（叔丁基过氧基）-2，5-二甲基己烷（Luperox或L101）含量和TSE螺杆转速对马来酸化PLA的接枝MA度（MA（g））和数均分子量（M-n）的影响（PLA-g-MA），其可用作生产具有各种组分的PLA共混物的反应性增容剂。PLA-g-MA的FT 1 R峰表明MA被接枝到PLA主链上并且还存在低聚MA。通过滴定测定的最大0.52重量% MA（g）是以M-n减少50%和多分散指数增加至约2.0为代价实现的。L101和MA（g）对PLA-g-MA的M-n稳定性有较大影响。名义上，MA的量等于4.5wt%，L101在0.45和0.65wt%之间，并且螺杆速度为20 rpm提供了用于将MA接枝到PLA上的最佳条件。(C)2013爱思唯尔有限公司保留所有权利。
A response surface methodology (RSM) design was used to analyze the effects of maleic anhydride (MA) and 2,5-bis(tert-butylperoxy)-2,5-dimethyl hexane (Luperox or L101) content, and TSE screw speed on the degree of grafted MA (MA(g)) and number average molecular weight (M-n) of maleated PLA (PLA-g-MA), which can be used as a reactive compatibilizer in production of PLA blends with various components. PLA-g-MA's FT1R peaks indicated that MA was grafted onto the PLA backbone and oligomeric MA was also present. A maximum of 0.52 wt% MA(g) determined by titration was achieved at the expense of a 50% reduction of M-n and an increase in the polydispersity index to around 2.0. Generally, increasing L101 increased the degree of grafting and decreased M-n L101 and MA(g) had a large effect on the stability of PLA-g-MA's M-n during storage. Nominally, amounts of MA equal to 4.5 wt%, L101 between 0.45 and 0.65 wt%, and screw speed of 20 rpm provided the optimal conditions for grafting MA onto PLA. (C) 2013 Elsevier Ltd. All rights reserved.