三中单体的聚合产生了具有两相的三元共聚物，一个是苯乙烯-丙烯腈的连续相， 另一个是聚丁二烯橡胶分散相。
The polymerization of the three monomers produces a terpolymer which has two phases: a continuous phase of styrene-acrylonitrile (SAN) and a dispersed phase of polybutadiene rubber.
这个过程不断重复，更多的单体连续地加入到反应中心上，形成大的自由基反应中心。
The process is repeated as many more monomer molecules are successively added to continuously propagate the reactive center.
得出在壳层单体采用预乳化半连续加料法；
The reaction conditions of the emulsion were determined: the feeding method of shell monomer was starved semi-continuous;
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