聚乳酸接枝马来酸酐共聚物的制备与表征  

Preparation and Characterization of PLA Copolymer Grafted by Maleic Anhydride

作　　者：赵宇超[1] 张举[1] 蔡淑琼 吴智华[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065 [2]成都航天模塑股份有限公司,四川成都610100

出　　处：《塑料科技》2014年第2期53-59,共7页Plastics Science and Technology

基　　金：2012年广东省重大科技项目资助(2012A0801050021)

摘　　要：研究了利用马来酸酐（MAH）熔融接枝聚乳酸（PLA），制备耐热性、韧性、吸水性较好，熔体黏度较高的PLA共聚物。通过IR、棱磁共振、接枝率、MFR、力学性能、DSC、TGA较全面地表征了反应工艺对接枝物特性的影响。结果表明：在恒温175℃的密炼机中，以过氯化苯甲酰（BPO）为引发剂，MAH单体含量为4phr，反应时间6－8min。成功地制备出接枝率为0．98％的PLA-g—MAH共聚物；与PLA相比，PLA-g-MAH的起始分解温度和完全分解温度均提高50℃以上，断裂伸长率和熔体黏度有所提高。结晶度随着接枝单体MAH含量的增加呈现先降低后提高的趋势。Maleated poly（lactic acid）（PLA-g-MAH） with high heat resistance, toughness, absorbent and melt viscosity was prepared by melt-compounding method. The effects of reaction process on the graft characteristic were investigated by IR, NMR, grafting ratio, MFR, mechanical testing, DSC and TGAo The result show that： PLA-g-MAH which grafting ratio is 0.98% is obtained under the temperature of 175~C, with blending benzoyl peroxide （BPO） as initiator with 4 phr MAH in the internal mixer for 6-8 min. Compared with pure PLA, both the initial decomposition temperature and the completely decomposition temperature of PLA-g-MAH rise more than 50℃; and then the elongation at break and melt viscosity increase, the degree of crystallinity reduces firstly and then increases with the increasing of MAH content.

关 键 词：聚乳酸 接枝 耐热性 力学性能 降解性能 制备 表征 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]