Rheological and morphological characteristics of polyvinylchloride/polychloroprene blends––effect of temperature and mixing speed

A rheological study of an amorphous polychloroprene (PCP) with polyvinylchloride (PVC) blends during fusion processes has been carried out with respect to their compatibility over the complete composition range. The results are interpreted in terms of thermal analysis and morphology. By means of a Brabender plasticorder, the mixing sequence and optimum PVC content, at least for microscopically homogeneous blends, can be determined from the rheological point of view. The disperse state of the polyblend has also been observed by scanning electron microscopy (SEM) study. Experimental results show that PCP can promote the processability and fusion of PVC. Torque–rpm behaviour exhibit the “entanglement plateau” effect, the polymer–solvent interaction lying beyond the tolerated limit, temperature and rpm promote additional gelation of PVC particles. It has also been found that the mixing sequence has a profound influence on the processability and compatibility of the melt blend system studied. Microreticular phase structures are observed at higher rpms and temperatures.