Melt Free-Radical Grafting of Maleic Anhydride onto Biodegradable Poly(lactic acid) by Using Styrene as a Comonomer
Melt Free-Radical Grafting of Maleic Anhydride onto Biodegradable Poly(lactic acid) by Using Styrene as a Comonomer
复制标题
以苯乙烯为共聚单体将马来酸酐熔融自由基接枝到可生物降解的聚乳酸上
DOI：
10.3390/polym6051528
复制
发表时间：
2014-05-01
期刊：
影响因子：
5
通讯作者：
Chen, Mingqing
中科院分区：
文献类型：
--
作者：
Ma, Piming;Jiang, Long;Chen, Mingqing
在苯乙烯（St）存在下，采用自由基接枝法将马来酸酐（MA）接枝到聚乳酸（PLA）上。当St/MA比例为2/1时，MA的接枝率（D-g）从0.65wt%提高到1.1wt%，MA的接枝效率（E-g）为27%。然而，随着St/MA比进一步增加到4/1，D-g和E-g都降低。在165 ℃ ~ 190 ℃的温度范围内，MA的D-g随MA浓度的增加而增加，在180 ℃时出现最大值。根据滴定、热重分析和红外光谱分析结果，分析了St存在下MA的接枝机理，MA通过单一单体和电荷转移络合物（CTC）接枝到PLA链上，St/MA的比例为
Maleic anhydride (MA) was grafted onto poly(lactic acid) (PLA) in the presence of styrene (St) by using a free-radical grafting methodology. The grafting degree (D-g) of MA was increased from 0.65 wt % to 1.1 wt % with the St/MA ratio up to 2/1, where the grafting efficiency (E-g) of MA was 27%. However, both D-g and E-g were decreased with further increasing of the St/MA ratio to 4/1. The D-g of MA increased with MA concentration and showed a maximum at 180 degrees C in the temperature range of 165 degrees C-190 degrees C. The grafting mechanisms of MA in the presence of St are analyzed based on titration, thermogravimetric analysis and infrared results, i.e., MA is grafted onto PLA chains via single monomers and a charge-transfer-complex (CTC) at St/MA ratios of