Structure and properties of IPC

Abstract

Five impact copolymerized polypropylene (IPC) products with the melt flow rate of 28 g/10 min and the mass fraction of ethylene content of 10% were compared in terms of mechanical properties,phase structure,melting and crystallization,size and distribution of rubber phase,and processability. The results show that the overall mechanical properties of the sample IPC-4 are the best,whose tensile strength is 24.60 MPa,flexural modulus is 1401.71 MPa,and impact strength is 10.02 kJ/m2. IPC consists of three parts:random copolymer,block copolymer and homo-polymer. IPC-4 has the highest melting enthalpy and crystallization enthalpy,representing high crystallinity and rigidity. The distribution of pores in IPC-4 is more uniform with the average pore diameter of 1 μm. The processing performance of these five samples is relatively close,and the optimum injection temperature is 200 ℃.