Yz. Bao et al., Structure-property relationships of lightly chemical crosslinked poly(vinyl chloride) thermoplastic elastomer, J APPL POLY, 76(6), 2000, pp. 868-874
Chemical crosslinked poly(vinyl chloride) (C-PVC) was synthesized by vinyl
chloride suspension polymerization in the presence of diallyl phthalate (DA
P) and plasticized to prepare poly(vinyl chloride) (PVC) thermoplastic elas
tomer (TPE) materials. The chemical crosslinking and physical crosslinking
structure in chemical crosslinked PVC-TPE were investigated. It showed that
the gel fraction and the crosslinking density of gel increased as the feed
concentration of DAP increased. C-PVC prepared by VC/DAP copolymerization
was lightly crosslinked as compared with irradiation crosslinked PVC. Physi
cal entanglements would greatly influence the crosslinking density of gel w
hen the gel fraction was high. Chemical crosslinking had little influence o
n the recrystallization behavior of PVC. A structure model of chemical cros
slinked PVC-TPE was proposed, in which chemical networks acted with physica
l networks cooperatively. It also showed that chemical crosslinking and phy
sical crosslinking influenced the processability and mechanical properties
of chemical crosslinked PVC-TPE cooperatively. Although the processability
of PVC-TPE deteriorated with chemical crosslinking, the dimension stability
and elasticity of PVC-TPE were improved as the permanent chemical networks
were introduced. (C) 2000 John Wiley & Sons, Inc.