Differential scanning calorimetry (DSC) was used to investigate the crystallinity of crude PVC powders and annealed PVC compounds. Crude PVC powder exhibited a broad crystallite fusion endotherm ranged from 110°C to 220°C. High degree of polymerization of PVC showed high degree of crystallinity both for powder and annealed sample under the same annealing conditions. Annealing conditions (time and temperature) had large effects on recrystallization behavior of PVC. The crystallinity of PVC decreased with increasing of DOP plasticizer content in PVC compounds, and lead to decrease of modulus and increase of average molecular weight between physical crosslinks.
From Y. Bao | Z. Weng | Z. Huang | Z. Pan
Institue of Polymer Science and Engineering, Zhejiang University, Hangzhou, China
Appeared in International Polymer Processing 1996/04, Page 369-372
Direct link: http://www.polymer-process.com/IPP960369
The Crystallinity of PVC and its Effect on Physical Properties [432 KB]
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