Copolymerization of propylene with higher α‐olefin using supported titanium catalyst system

Abstract

Copolymers of propylene/1‐octene and propylene/1‐hexene were synthesized in slurry phase polymerization using MgCl2/TiCl4/Diester based catalyst system. The Al/Do (co‐catalyst/external donor), Al/Ti (co‐catalyst/catalyst) mole ratio variations were investigated for effect on polymerization and copolymer properties. Incorporation of comonomer (1‐hexene and 1‐octene) has influenced the molecular weight distribution (MWD) of resultant copolymers as well as isotacticity. The differential Scanning Calorimetry (DSC) results showed lower melting point for propylene/1‐hexene than propylene/1‐octene copolymer. The gel permeation chromatography (GPC) study indicated broad MWD of both type of copolymers compared to homo PP. The 13C NMR has also been performed to quantitatively evaluate incorporation of comonomer in polymer backbone. Propylene copolymerizaiton with hexene resulted in the copolymer which have relatively higher amount of 1‐hexene compared to 1‐octene incorporation in copolymer of propylene/1‐octene with similar catalyst system explain the reason for lower peak melting points.

In situ synthesis of novel trans‐1, 4‐polyisoprene/isotactic polybutene reactor blends with multi‐component structure

“…5 And then, the copolymerization of butadiene and propolyene has attracted more and more attentions due to the possibility for further functionalization and more attractive properties. [6][7][8][9][10][11][12][13][14][15] Shiono reported isotactic polypropylene (iPP) containing pendant vinyl groups through the copolymerization of propylene and 1, 3-butadiene with metallocene catalyst. 16 Longo observed 1, 2-polymerization of butadiene in the copolymerization of propylene and butadiene by using highly hindered C2-symmetric Zirconocene-based metallocene catalyst.…”

“…The first reported α‐olefin and diene copolymerization is the alternating coordinated anionic copolymerization of ethylene with butadiene by using vanadium system by Natta 5 . And then, the copolymerization of butadiene and propolyene has attracted more and more attentions due to the possibility for further functionalization and more attractive properties 6–15 . Shiono reported isotactic polypropylene ( i PP) containing pendant vinyl groups through the copolymerization of propylene and 1, 3‐butadiene with metallocene catalyst 16 .…”