In the microgel core of (PS)n, there were a number of active initiating sites for ATRP, 1-bromoethylbenzene groups, which were from the addition of linear PS macrointiators to vinyl groups of DVB.

• 在核内，仍存在ATRP活性引发点1-溴乙基苯基基团，它们是由聚苯乙烯链加成到DVB单元的乙烯基基团后得到，且其数目理论上等于PS的臂数。