| β-PHASE CRYSTALLIZATION OF ISOTACTIC POLYPROPYLENE |
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| 引用本文： | 史观一,黄斌,张景云,曹友虹.β-PHASE CRYSTALLIZATION OF ISOTACTIC POLYPROPYLENE[J].中国科学B辑(英文版),1987(3). |
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| 作者姓名： | 史观一 黄斌 张景云 曹友虹 |
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| 作者单位： | Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica |
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| 摘 要： | Effects of cooling rate and crystallization and melt temperatures on the melting curves of predomi-nately β-phase isotactic polypropylene (IPP) were investigated by using DSC instrument. Experimental re-sults indicate that the magnitude of βmelting endctherm increases with decreasing cooling rate and withincreasing crystallization temperature. The temperature of melt has no effect on the β-phase crystallizationof IPP below 300℃, but a further increase of the melt temperature will destroy the β-phase nuclei,then the β-phase crystals will not be produced upon cooling. The linear growth rates of α- and β-phasespherulites were determined as a function of temperature between 123 and 140℃. It was found that thegrowth rate of βspherulites is higher than that of αspherulites below 140℃. Studies of the kinetics ofβ-phase crystallization of IPP were also made using a DSC instrument. The results obtained do not fitthe usual Avrami equation. But it can be described by kinetic theory of imcomplete spher
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