| 摘要 |
Disclosed is a method for making polystyrene with Mw between about 1,000 and about 50,000 and Mw/Mn ratio of less than about 8 by cationically polymerizing styrene monomer under substantially isothermal conditions where the conversion of styrene monomer is carried out in 2 or more stages by contacting with a cation generator. The polystyrene product finds utility as plasticizer for high molecular weight polystyrenes, as a binder resin in various coating applications, and as a precursor for further functionalized polystyrene derivatives. For example, a polystyrene of about 13,000 Mw and Mw/Mn of about 4.9 is prepared by contacting styrene monomer with BF3 in 4 stages between a temperature of about 60 DEG C. and about 80 DEG C.
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