Properties of semicrystalline polyolefins. II. Copolymers of 3‐methyl‐1‐pentene and 4‐methyl‐1‐pentene | Zendy

Isaacson R. B. | Zendy; Kirshenbaum I. | Zendy; Klein I. | Zendy

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Properties of semicrystalline polyolefins. II. Copolymers of 3‐methyl‐1‐pentene and 4‐methyl‐1‐pentene

Author(s) -

Isaacson R. B.,

Kirshenbaum I.,

Klein I.

Publication year - 1965

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.1965.070090311

Subject(s) - copolymer , pentene , melting point , monomer , materials science , crystallinity , polymer chemistry , reactivity (psychology) , crystal structure , polymer , chemistry , catalysis , organic chemistry , composite material , medicine , alternative medicine , pathology

A study of the copolymerization of 3‐methyl‐1‐pentene (3‐MP) and 4‐methyl‐1‐pentene (4‐MP) showed that the poly‐4‐MP crystal lattice is capable of incorporating large quantities of 3‐MP without a sharp lowering of melting point or adverse effect on physical and mechanical properties. The reactivity ratio of the two monomers in copolymerization are r (4‐MP) = 6.2 ± 0.2 and r (3‐MP) = 0.1 ± 0.1. As a result, mixed feeds containing up to 80% 3‐MP produce copolymers composed primarily of repeating 4‐MP units, with a random insertion of 3‐MP monomer units. Calculations indicate that in a copolymer containing 37% 3‐MP, the probability of finding a sequence of 2 units of 3‐MP is only a little better than 5%. This copolymer shows a somewhat increased resistance to deformation under load than homopoly 4‐MP. Its crystalline melting point is 248°C.

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