聚丙烯接枝己内酯型增容剂的合成及其共混增容应用

以含悬挂羟基的聚丙烯为引发剂，辛酸亚锡为催化剂催化己内酯开环聚合，成功制备了一系列支链为聚己内酯的功能化接枝聚丙烯，并通过核磁共振、红外光谱、示差扫描量热（DSC）和广角X射线衍射（WAXD）等技术手段对聚合物进行了明确的结构表征。 研究了反应温度和时间对接枝反应的影响，结果表明，最佳反应温度为90 ℃，通过改变接枝时间可以调控己内酯链段的长度。 将成功接枝的功能化聚丙烯用做聚丙烯与尼龙-6共混体系的增容剂，并通过扫描电子显微镜（SEM）观察的方法考察了该增容剂对共混体系的影响。 SEM 显示增容剂的加入显著地降低了界面张力，减小了分散相的尺寸，增强了界面的粘结性。

Synthesis of Polypropylene-graft-polycaprolactone Polymer and Its Application as Blending Compatibilizer

Using polypropylene containing pendant hydroxyl groups as initiator and stannous octoate as catalyst, a serial of well-defined polypropylene-graft-polycaprolactone polymers was synthesized via ring opening polymerization, and the structures of the polymers were characterized by NMR, IR, DSC and WAXD. In addition, the influence of temperature and time on the grafting reaction was studied. The results show that the optimal reaction temperature is 90 ℃ and the grafting lengths can be controlled by regulating reaction time. Furthermore, the functional polypropylene were used as compatibilizer for polypropylene/nylon-6 blends, and the influence of compatibilizer on the blends was investigated by SEM. The SEM reveals that the interfacial tension and dimensions of separated phases are markedly reduced while interfacial adhesion is greatly enhanced because of the addition of the compatibilizer.