Figure 5.

Size-exclusion chromatography (SEC) analysis results of molecular weight determination.However, the results of SEC analysis revealed that the molecular weights were almost equal regardless of the variation in molecular weight of PEG and PEG: PDI ratio. It was expected the molecular weight would increase as the PEG molecular weight increased and PEG: IPDI ratio increased (hard segment content increased) [28]. Nevertheless, this does not apply for all process systems [29]. Diez-Garcia et al. has got results with decreasing molecular weight of WSPU as PEG content increased in contrast to our results which were constant [30].