Preparation Of10-undecen-1-ol/Propylene Copolymer And Hydrophilic Modification Research Of Polypropylene Blends

PP is used in a wide variety of applications due to its excellent properties such as lowcost, high mechanical strength, flexibility, chemical stability and processibility. However, the inertnature leads to an incompatibility with other polymers or inorganic fillers to affect furtherapplication of PP. In this paper, we investigated modification approach of PP by means ofcopolymerization and blending.Copolymerization of propylene and10-undecen-1-ol was conducted withfluorenylamidodimethyl titanium complexes activated by modified methyaluminoxane (MMAO)and2,6-isopropyl-phenol (BHT) as catalyst. The catalyst system showed very high activity(810-47040kg·mol-1·h-1) to produce high molecular weight random copolymers with Mnvalue of150000-450000, and the comonoer content was increased with the increase of the amount ofcomonomer. These results indicate that hydroxyl functionalized polypropylene (PP-OH) weresynthesized with high molecular weight and controllable hydroxyl content via coordinationpolymerization.PP/PP-OH blends were prepared by melt blending isotactic PP and PP-OH with variousweight ratios. The results of contact angle, ATR-FTIR, DSC, TGA and tensile testing analysistestified that the water contact angle of PP/PP-OH blend was decreased from117°to98°withincreasing the amount of PP-OH, the hydrogen bond was observed in the blending system,PP/PP-OH blends showed lower melting points than isotactic PP, while the decompositiontemperatures of blends were a little higher than isotactic PP. When added isotactic functionalpolypropylene to PP, it was helpful to improve mechanical properties of blends, and the systemsmaintained the form of ductile fracture. However, when added random functional polypropylene,there was a serious decline in the mechanical properties of the systems, and the blends occurredbrittle fractures.