Comparison of the crystallization behavior of syndiotactic polypropylene and isotactic polypropylene

초록

The study was made to compare the crystallization behavior of polypropylene (PP) with different stereo-regularity. The unit cell parameters, lamellar structure of PP, and the growth of thieir sphendites were strongly dependent upon the crystallization condition. It was shown that metastable structure appeared with increasing cooling rate. The structural change of isotactic PP (iPP) was larger than that of syndiotactic PP (sPP). The crystal structure of sPP showed body centered cell III when it is cooled down with 1 degreesC/min. When sPP was grown to primitive cell H structure, both unit cell and lamellar structure were less affected by a cooling rate. The overall crystallization rate of iPP was faster than that of sPP.

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