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6655245 
Journal Article 
POLYMER ASSOCIATION IN STYRENE-ACRYLIC ACID COPOLYMERS 
Wang, LF; Pearce, EM; Kwei, TK; , 
1990 
1 
Journal of Polymer Science, Part C: Polymer Letters
ISSN: 0887-6258 
JOHN WILEY & SONS INC 
NEW YORK 
28 
11 
317-321 
English 
WOS:A1990DY59900001 
Copolymers were prepared by free radical polymerization in dioxane for 3 h at 60°C, using AIBN as the initiator. After isolation and reprecipitation into a large amount of methanol, they were dried at 90°C in a vacuum oven for 14 days. The low drying temperature was chosen to avoid inadvertent anhydride formation from carboxyl groups. Infrared spectra of the copolymer films were taken by a Digilab FTS-IR spectrometer. Sixty-four scans were signal-averaged at a resolution of 2 cm-1. The glass-transition temperatures were determined with the use of a Perkin-Elmer differential scanning calorimeter (DSC-7) at a heating rate of 10°C/min and taken at the midpoint of the abrupt heat-capacity jump. Tg values for the copolymers are indeed higher than are the Tg of either PS or PAA.