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M. Kozłowski, V. Duchaćek, A. Kuta


Reactive processing of poly(vinyl chloride) blends


Polimery 1991, No 5, 181


DOI: dx.doi.org/10.14314/polimery.1991.181

Summary

Crosslinking process of poly(vinyl chloride) (PVC) and PVC/NBR systems (NBR) — butadiene-acrylonitrile rubber) in the presence of tetramethylthiuram disulfide (TMTD) as initiator has been described. The mechanical properties of crosslinked blends have been also determined. Crosslinking of NBR and blends containing 10 or 20 wt. % NBR progresses with a higher rate than crosslinking of unmodified PVC. Besides, the induction time of crosslinkig of these blends is much shorter than that of unmodified PVC. Products of covulcanization of PVC/NBR blends show considerably higher hardness and rigidity than the conventional unplasticized PVC compositions. Systems containing 20 wt. parts of NBR are characterized by high impact resistance which increases with their crosslinking degree. Electronmicroscopic observations of the fractures show microheterogeneity of the blends. NBR dispersed in PVC matrix absorbs a part of impact energy and undergoes irreversible deformation. The energy absorption capacity is determined by the mechanical strength of rubber and depends on its vulcanization degree.



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