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Miscibility and crystallization kinetics for the blend of isotactic polypropylene/ethylene-propylene random copolymer

✍ Scribed by M. Seki; S. Yamauchi; Y. Matsushita

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
99 KB
Volume
60
Category
Article
ISSN
0022-3697

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✦ Synopsis

Miscibility for blends of isotactic polypropylene (PP) and ethylene-D4-propylene random copolymer (EPR)s, which were prepared by copolymerization of propylene and 19 mol% (D-EPR19) and 47 mol% (D-EPR47) of perdeuterated ethylene with metallocene catalyst and then fractionated with a preparative GPC, have been investigated by SANS at various temperatures in the melt. SANS results indicate that most of PP/D-EPR blends are in homogeneous one-phase state in the melt and Flory-Huggins interaction parameter (x) analyzed by random phase approximation are approximately 5.0 × 10 Ϫ3 and less than 1.0 × 10 Ϫ3 for the blends of PP/D-EPR47 and PP/D-EPR19, respectively. Isothermal spherulite growth rate (G) for the blends was also measured by optical microscope at various temperatures and the depression of G was observed.

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