Premium
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.