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Properties of semicrystalline polyolefins: Poly‐4‐methyl‐1‐pentene
Author(s) -
Isaacson R. B.,
Kirshenbaum I.,
Feist W. C.
Publication year - 1964
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.1964.070080624
Subject(s) - materials science , ultimate tensile strength , melting point , crystallinity , copolymer , polymer , enthalpy of fusion , polypropylene , izod impact strength test , spherulite (polymer physics) , composite material , polymer chemistry , crystallization , chemical engineering , engineering
A study has been carried out of the thermodynamic properties, physical and mechanical properties, and crystallization behavior of poly‐4‐methyl‐1‐pentene (poly‐4‐MP). Data were obtained for the heat and entropy of fusion. Poly‐4‐MP is characterized by a comparatively high tensile strength, stiffness, and surface hardness. The impact is low at room temperature. The adverse effect of temperature on tensile strength, creep, and other polymer properties is greater for poly‐4‐MP than for polypropylene. Poly‐4‐MP is highly transparent, probably due to limited spherulite growth. Spherulitic growth was promoted through copolymerization with propylene by a technique of sequential monomer addition. The resultant product had an increased crystalline melting point (244 vs. 238°C. for the poly‐4‐MP homopolymer). The significance of these results and the effect of temperature on the birefringence of poly‐4‐MP are discussed.