Linear polymeric samples prepared as described earlier were analyzed by SEC using the following procedure:Approximately 25.0 mg of each sample were added to 10.0 ml of dimethylformamide (0.01 M lithium bromide).The samples were heated to 80 C for dissolution, although insoluble material remained in both samples after heating for 1 h. Both solutions were filtered using a 0.2-mm Teflon syringe filter. The SEC analysis was as follows: