PPC与IPDI原位聚合增韧聚乳酸

以聚碳酸亚丙酯多元醇(PPC)和异佛尔酮二异氰酸酯(IPDI)为反应性增韧单体,在熔融共混过程中原位聚合生成聚氨酯(PU)增韧相,制备了新型增韧PLA/PU材料。通过FTIR、万能电子试验机、TG、DSC、SEM测试研究了单体用量对PLA共混物加工性、相容性及韧性的影响规律。结果表明:随着增韧单体用量的增加,共混物中PLA组分的冷结晶温度(Tc)和玻璃化转变温度(Tg)降低;当n(NCO)/n(OH)=1/1,PPC用量为30%时,共混物的断裂伸长率和冲击强度比纯PLA分别增加71.8倍和15.6倍;原位聚合物对PLA有较好的增韧效果。

Preparation of Toughened Poly(Lactic Acid) by in situ Polymerization of PPC and IPDI

A new type of toughened PLA/PU material was prepared by using polypropylene carbonate(PPC)and isoferone diisocyanate(IPDI) as reactive toughening monomers. The PPC and IPDI would be in-situ polymerized into crosslinked polyurethane(PU) during melt blending as toughening phase. The influences of monomer dosage on the processability, compatibility and toughness of PLA/PU blends were characterized by FTIR, universal electronic testing machine, TG, DSC and SEM. The results show that with the amount of toughening monomer increases, the Tg and Tc of the PLA component in the blend decrease. When n(NCO)/n(OH) is 1/1, the PPC amount is 30%, the elongation at break and impact strength of the blend are increased by 71.8 times and 15.6 times compared to pure PLA, respectively;the in-situ polymer has a better toughening effect on PLA.