The radical polymerization of N-(p-vinylbenzyl)-N-vinylacetamide (1) prepared by the reaction of N-vinylacetamide with p-chloromethyl styrene was carried out by using radical initiators such as AIBN or BPO in benzene, chlorobenzene, or bulk. As a result, poly 1 was successfully isolated by dialysis (yield, 10-36%). The crosslinking reaction of poly 1 was carried out at 60-100 degrees C for 8 h. By using a radical initiator such as AIBN or BPO (3 mol %), the crosslinking reaction proceeded (yield, 63-79%). Moreover, the crosslinking reaction of poly 1 proceeded at 100 degrees C without a radical initiator in 50% yield. (c) 2006 Wiley Periodicals, Inc.