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Rheology of flexible PVC compounds. Part II: Verification of the crystallinity concept
Author(s) -
Hookanson S. H.,
Smith D. L.,
Irvine J. L.
Publication year - 1986
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730080105
Subject(s) - crystallinity , elasticity (physics) , crystallite , rheology , materials science , grain boundary , composite material , metallurgy , microstructure
It has been proposed that changes in elasticity associated with the processing of PVC are influenced by the crystallinity of the resin. In the early stages of processing, crystallites melt and elasticity decreases. As grains fuse together, new crystallites are formed in the previously unoccupied grain boundaries and the elasticity increases. A theoretical curve combining the percent of crystallinity with the developing boundary volume has been developed. This curve can be used to predict how elasticity changes with time. Experimental observations detailing the changes in elasticity with respect to processing verify these predictions.