Analogue calorimetry of polymer blends: poly(styrene-co-acrylonitrile) and poly(phenyl acrylate) or poly(vinyl benzoate)
1996; Elsevier BV; Volume: 37; Issue: 12 Linguagem: Inglês
10.1016/0032-3861(96)85356-0
ISSN1873-2291
AutoresD. Rana, B. M. Mandal, Souvik Bhattacharyya,
Tópico(s)Chemical Thermodynamics and Molecular Structure
ResumoUnlike poly(phenyl acrylate) (PPA), its isomer poly(vinyl benzoate) (PVBZ) is immiscible with poly(styrene-co-acrylonitrile) (SAN). The difference in miscibility behaviour of PPA and PVBZ towards SAN is also reflected in the heats of mixing (ΔHm) of the low-molecular-weight analogues of the respective blend components at compositions corresponding to øSAN = 0.92 in the blend. It turns out that propionitrile, the hydrogenated monomer of polyacrylonitrile (PAN), is very unsuitable as an analogue of the latter. In contrast, acetonitrile, having a solubility parameter closer to PAN, is a fairly acceptable analogue of PAN as far as miscibility of the latter with PPA is concerned in the PAN-rich region, øPAN > 0.7.
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