Eutectic solidification of the quasi binary system of isotactic polypropylene and 1, 2,4, 5‐tetrachlorobenzene

Wiley - Tập 9 Số 3 - Trang 258-263 - 1977
Paul F. Smith1, G. O. R. Van Alberda Ekenstein1, A. J. Pennings1
1Department of Polymer Chemistry, State University of Groningen, Groningen, the Netherlands

Tóm tắt

AbstractThis paper describes a study on eutectic solidification of the quasi binary system of un‐fractionated isotactic polypropylene and the faceted growing diluent 1,2,4,5‐tetrachlorobenzene. According to the Flory‐Huggins theory of melting point depression the phase diagram of the present system does not exhibit a eutectic point for equilibrium conditions. However, under experimental circumstances a simple “eutectic‐type phase diagram” was found, in which the location of the eutectic point was determined by kinetics to a large extent. The very nature of the eutectic solidification process was found to depend critically on the rate of cooling. At cooling rates lower than 0.5°C/ min the simultaneous crystallisation of the polypropylene and the tetrachlorobenzene proceeded in an uncoupled manner, producing a microstructure consisting of randomly mixed polypropylene spherulites and diluent needles with a characteristic dimension of about 0.1 mm. At speeds of cooling exceeding 0.5°C/min coupled growth of the polymer and the solvent occurred, forming a unique eutectic microstructure of curved diluent crystals homogeneously dispersed in a polymer matrix. The transverse dimension of these particular tetrachlorobenzene crystals was found to be in the micron range.

Từ khóa


Tài liệu tham khảo

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Thông tin xuất bản

Wiley

Tập 9 Số 3

258-263

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