AbstractA 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 birefringenc
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