| 摘要 |
PURPOSE:The titled polymer of a sharp MW distribution, which can give a high- strength molding, comprising acrylonitrile as a principal component and having a specified weight-average MW and a specified Mw/Mn ratio. CONSTITUTION:0.5-3wt%, based on monomer, water-soluble high-molecular substance (partially saponified PVA of a degree of saponification of 85-95%) and an oil-soluble initiator (e.g., 2,2'-azobisisobutyronitrile) are added to an aqueous medium containing at least 9wt% monomer mixture comprising 85-100wt% acrylonitrile and 15-0wt% other ethylenically unsaturated compounds (e.g., vinyl chloride). The resulting mixture is suspension-polymerized at 20-80 deg.C at a power requirement of an impeller of 1-10kWh/m<2> per volume of the reaction system to obtain a high-MW acrylonitrile polymer having a weight-average MW >=400,000 and a Mw/Mn ratio >=7.0.
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