A DSC study of poly(styrene-co-acrylonitrile) and poly(vinyl chloride-co-vinyl acetate) blends produced using different blending techniques
1996; Elsevier BV; Volume: 32; Issue: 2 Linguagem: Inglês
10.1016/0014-3057(95)00138-7
ISSN1873-1945
AutoresGaurab Das, Amar Nath Banerjee, B. C. Mitra,
Tópico(s)Polymer Science and PVC
ResumoAbstract Comparative and comprehensive studies of poly(styrene-co-acrylonitrile) (SAN) and poly(vinyl chloride-co-vinyl acetate) (VYHH) blends using several blending techniques such as melt-mixing, solution blending and co-precipitation methods by an appropriate non-solvent were performed. The compatibility of the blends was studied by measuring the glass-transition temperatures ( T g s ) of the blends and also by measuring the heat capactiy change ( ΔC p ) at the glass transition temperature for each blend using differential scanning calorimetry (DSC). The presence of either one or two T g s has been used as a criterion to determine the miscibility of each blend over a range of composition. It was found that for miscible blends the heat-capacity changes are equal to the calculated values, but for immiscible blends the experimental ΔC p is smaller than the calculated value. The results varied significantly from one blending technique to another and from solvent to solvent.
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