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Rheological properties of poly(vinyl chloride) / epoxidized natural rubber blends. Part II: The effect of processing variables
Author(s) -
Ishiaku U. S.,
Nasir M.,
Ishak Z. A. Mohd
Publication year - 1995
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.730010205.n
Subject(s) - materials science , rheology , natural rubber , composite material , vinyl chloride , shear rate , die swell , flow properties , shear (geology) , copolymer , polymer , extrusion , physics , mechanics
The effect of processing variables on the rheological properties of PVC/ENR blends was investigated. The role of crosslinking in determining the flow behavior of blends was also examined by means of dynamically cured blends. It was found that PVC/ENR blends yield melts that are power law fluids. The flow of the melts improves with an increase in temperature and shear rate. However, the introduction of crosslinks reverses this trend, although under more rigorous conditions, the influence of crosslinks is superseded, and subsequently, flow becomes shear rate and temperature dependent. PVC/ENR systems also manifested elastic phenomena. The dependence of the elastic phenomena such as die swell and melt fracture on L/D ratio of the die was demonstrated.