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Citation: Pang Deren, Zhang Jing, Huang Baotong. SYNTHESIS AND CHARACTERIZATION OF ETHYLENE-PROPYLENE COPOLYMERS WITH LONG C₃-SEQUENCES[J]. Chinese Journal of Applied Chemistry, ;1987, 4(3): 11-16. shu

SYNTHESIS AND CHARACTERIZATION OF ETHYLENE-PROPYLENE COPOLYMERS WITH LONG C₃-SEQUENCES

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Pang Deren,
Received Date: 15 February 1986
Available Online: 26 June 1986

Random ethylene-propylene copolymers with statistically distributed long C₃-sequences should have thermoplastic elastomeric properties as a result of the dual features in its molecular structure, contributing both to elasticity and PP higher temperature plasticity. In this work 6-TiCl₃-Et₂AlCl catalyst was used in an attempt to obtain E-P copolymers with isotactic PP sequences for the benefit of higher strength.The effect was studied of[Ti],[Al]/[Ti], polymerization temperature and duration, and monomer composition on the polymerization yield,[η], MWD and copolymer composition. Structure of the copolymers was proved by heptane-extraction, dynamic mechanical properties,IR spectra and x-ray diffraction studies. Crystallinity is the prime factor responsible for their strength, to which[η] also contribates. High C₃ E-P copolymers are characterized by high crystallinity, strength and hardness and high elongation. A sample with C₃=79.8 mol% had a 300% modulus of 102 kg/cm² and a breaking strength of 135 kg/cm².
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SYNTHESIS AND CHARACTERIZATION OF ETHYLENE-PROPYLENE COPOLYMERS WITH LONG C₃-SEQUENCES