期刊
POLYMER INTERNATIONAL
卷 52, 期 1, 页码 42-45出版社
JOHN WILEY & SONS LTD
DOI: 10.1002/pi.984
关键词
additive; crystalline characteristics; isotactic polypropylene
The influence of a mixed additive of lanthanum stearate and stearic acid on the crystalline characteristics of isotactic polypropylene (iPP) has been investigated. The results of the wide-angle X-ray diffraction (WAXD) measurements and the melting behaviour examination by differential scanning calorimetry (DSC) show that the additive might induce a high proportion of beta-form and act as a beta-form nucleating agent. The relative content of beta-form estimated by WAXD is 33.1% in a PP containing 2.5% (by weight) of the additive. Isothermal crystallization at 130degreesC, examined by DSC, reveals that the additive considerably accelerates the overall rate of crystallization: the half crystallization period t(1/2), decreases from 11.7min for pure PP to 7.3min for PP containing 2.5% of the additive. However, the additive has no obvious influence on the nucleation mechanism and crystal growth mode. Polarized light microscopy (POM) examinations indicate that the addition of the additive to PP causes spherulites to become much finer. (C) 2003 Society of Chemical Industry.
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