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6607429 
Journal Article 
BLENDS OF STYRENE MALEIC-ANHYDRIDE COPOLYMERS WITH POLYMETHACRYLATES 
Brannock, GR; Barlow, JW; Paul, DR; , 
1991 
Yes 
Journal of Polymer Science. Part B, Polymer Physics
ISSN: 0887-6266 
JOHN WILEY & SONS INC 
NEW YORK 
29 
4 
413-429 
WOS:A1991EY24800004 
The phase behavior of a series of styrene/maleic anhydride (SMA) copolymers with various polyacrylate and polymethacrylate homopolymers has been investigated using various techniques. None of the polyacrylates are miscible with SMA copolymers. Poly(methyl methacrylate) (PMMA) poly (ethyl methacrylate) (PEMA) and poly (n-proply methacrylate) (PnPMA), are miscible with these copolymers over a certain range of maleic anhydride contents; whereas, the higher methacrylates apparently have no region of miscibility. For PEMA and PnPMA, the miscibility windows extend through 0% MA; hence, polystyrene is miscible with these polymethacrylates although the lower critical solution temperature is quite low. The exothermic heat of mixing styrene and ester analogs found here supports the observed miscibility of polystyrene with ethyl, n-propyl, and cyclohexyl (reported elsewhere) methacrylates. Lattice fluid interaction parameters for styrene-methacrylate obtained from the cloud points of these blends agree quite well with the Flory-Huggins parameters obtained from copolymer miscibility windows. 
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