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The processability of different grades of polyisobutylene (PIB) was investigated using a capillary rheometer. Direct focus was given to the occurrence of melt fracture phenomena, such as sharkskin and gross melt fracture (GMF). The influence of molecular weight (MW) of PIB, temperature and die entrance angle on melt fracture was examined in detail. Due to their highly elastic nature, high MW PIBs...
The rheology and wall slip behavior of several polyisobutylene (PIB) melts with different molecular weights were studied using parallel-plate and capillary rheometry. All PIBs studied were found to slip even at very low wall shear rates. The transition from weak to strong slip (nearly plug flow) was found to occur at a wall shear stress of approximately 0.09 MPa. The slip model developed by Ebrahimi...
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