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《Chemical Research In Chinese Universities》 2001-01
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Lanthanum Stearate Composite Act as β-Modification Nucleating Agent of Isotatic Polypropylene

FENG Jia-Chun~1,2, CHEN Ming-Cai~2, HUANG Zhi-Tang~1 (1. Institute of Chemistry, Academia Sinica, Beijing 100080, China; 2. Guangzhou Institute of Chemistry, Academia Sinica, Guangzhou 510650, China)  
A composite of 60% of lanthanum stearate and 40%(mass fraction) of stearic acid was prepared and its influence on the crystallization characteristics of isotatic polypropylene (iPP) was investigated. The results showed that we had found a new kind of β-crystalline form nucleating agent. The composite might induced rather high proportion of β-modification. The relative content of β-phase estimated by WAXD and DSC was 30% and 51.8% in a PP containing 2.5%(mass fraction) of the composite respectively. The isothermal crystallization at 130 ℃ and melting behavior examined by DSC revealed that the composite accelerated the overall rate of crystallization remarkably. The half crystallization period t_1/2 decreased from 11 8 min of pure PP to 7 5 min of PP containing 2.5% of the composite. However, the composite had no obvious influence on crystallization mode and the size of α-crystal unit cell.
【CateGory Index】: O631
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