| 초록 |
It is well known that the amphiphilic polymers which consist of both hydrophobic and hydrophilic groups can stabilize polymer particles and can form aggregates, like micelles, as the results of the intermolecular and/or intramolecular hydrophobic interactions.1-3 However, few publications can be found concerned with alkali-soluble random copolymers (ASR) as a polymeric emulsifier in emulsion polymerization.4 The properties of alkali-soluble random copolymers are expected to be similar to those of other polymeric emulsifiers, but the behavior and contribution in emulsion polymerization would be different from those of conventional polymeric emulsifiers. The present study was undertaken to investigate the contributions of ASR [poly(styrene/alpha-methylstyrene/acrylic acid)] in the emulsion polymerization of styrene with a water-soluble initiator, potassium persulfate. The aqueous solution behaviors of ASR, such as aggregate formation, and the effects of the concentration and neutralization degree (used here to denote OH/COOH ratio times 100) of ASR on the rate of polymerization and latex particle size were investigated. The calorimetric technique was applied to study in detail the emulsion polymerization using ASR. This technique provides in an almost continuous way, the heat of reaction which is directly proportional to rate of polymerization, Rp.5
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