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Citation: Liu Jingjiang, Wei Xiufen. STUDY ON THE PROPERTIES OF POLYPROPYLENE WOLLASTONITE COMPOSITES[J]. Chinese Journal of Applied Chemistry, ;1990, 7(2): 30-34. shu

STUDY ON THE PROPERTIES OF POLYPROPYLENE WOLLASTONITE COMPOSITES

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received Date: 8 June 1989
Available Online: 26 July 1989

A study has made on the thermal, x-ray diffraction, and dynamic mechanical characterit-tics of polypropylene (pp) (containing 22% ethylene) filled with wollastonite. Different levels of β-form crystallinity were produced in the pp by mixing wollastonite. All the sa-mples filled with wollastonite contain both β and α-forms and four melting transitions were observed instead of two for the unfilled pp. The crystals were found to be changed from β-form to α-form on heating. The relative proportions of β-form present in the specimens was measured from the x-ray diffraction diagram by an empirical ratio K.The K value increases with increasing the con-tent of wollastonite fillers. Wollastonite in the composite is as a reinforecement and nucleator for β-form crystals of pp and it is bound into crystalline phases of pp.
- polypropylene composite,
- wollastonite,
- dynamic mechanical properties,
- crystal form
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