环氧大豆油化学接枝聚乳酸的制备及其性能

Preparation and Properties of Polylactic Acid Chemically Grafted with Epoxidized Soybean Oil

用化学改性方式将环氧大豆油(ESO)与用马来酸酐(MAH)改性过的PLA接枝(MPLA),制备了反应性增容剂ECP并提出其可能的接枝机理。用FT-IR、DSC、SEM等手段表征ECP,研究了制备ECP时4种加料方式和ESO与MAH基团的摩尔比对其接枝率和酸值的影响。结果表明:在MPLA阶段先加入1/3配方比的ESO,在化学接枝阶段加入剩余的ESO和全部的三乙胺,制备出的ECP接枝率最高达4.1514%;ESO与MAH基团的摩尔比为1时产物的接枝效果最好。ECP改性的PLA材料其综合性能优于ESO改性的PLA材料,ECP的加入使PLA的疏水性能提高。

Maleic anhydride(MAH) grafted polylactic acid(PLA), namely MPLA was made via melting reaction method. Then reactive compatilizer ESO-G-(MAH-co-PLA)(ECP) was further prepared via chemical graft of epoxidized soybean oil(ESO) and MPLA. The prepared ECP was characterized by FTIR, DSC and SEM. The influence of four different feeding methods and mole ratio between ESO and MAH on graft rate and acid value of ECP was investigated. The results show that during the MPLA preparation stage, 1/3 of the desired amount ESO was added first, and subsequently the remaining 2/3 of ESO and all triethylamine were added at the chemical graft stage, as a result the grafting rate of ECP was up to 4.1514%;When the mole ratio of ESO to MAH group is 1, the grafting effect of products is the best.The PLA material modified with ECP has better comprehensive performance than the one with ESO. The addition of ECP can improve the hydrophobic performance of PLA.