Preparation And Properties Of PP/POE/Glass Fiber Composites

Polypropylene (PP) has been widely used in many fields due to its excellentchemical resistance, good mechanical properties and low cost. However, its poor impactstrength at low temperature and high shrinkage rate greatly limits the further applications.Here, PP/ethylene-octene copolymer (POE)/glass fiber (GF) composites were preparedwith POE as toughening agent, GF as reinforcing agent by twin-screw extruder andinjection molding, the effects of every components on structure and properties ofPP/POE/GF composites were discussed, and the non-isothermal crystallization andkinetics of PP phase in the composites were studied.The results indicated that POE is compatible with PP, and could be homogeneouslydispersed in PP matrix. As POE content is25phr, the notched impact strength of thePP/POE blend is increased by165%compare with that of pure PP. Due to thecompatibilization of POE-g-MA, the interfacial interaction between GF and compositematrix is greatly enhanced. As the mass ratio of PP and POE is100:25, GF content is27.9%, and POE-g-MA is10~15phr, the PP/POE/GF composite has the optimalmechanical properties, its notched impact and tensile strength values are12.6kJ/m2and35.9MPa, and increased by68%and17%compare with those of pure PP, respectively.With the addition of POE, POE-g-MA and GF, the PP matrix is reinforced and toughenedsimultaneously, and its shrinkage rate is greatly decreased to0.07%from2.0%of purePP. Moreover, the crystallization of PP phases in composites is accelerated due to theheterogeneous nucleation of POE and GF, and Jeziorny and Mo models can be used todescribe the non-isothermal crystallization of PP/POE/GF composites.