Submicron structured polymethyl methacrylate/acrylonitrile-butadiene rubber blends obtained via gamma radiation induced ?in situ? polymerization

2004 ◽  
Vol 23 (3) ◽  
pp. 211-221 ◽  
Author(s):  
G. Spadaro ◽  
C. Dispenza ◽  
P. T. Mc Grail ◽  
A. Valenza ◽  
D. Cangialosi
Keyword(s):  
Gamma Radiation ◽  
Polymethyl Methacrylate ◽  
In Situ Polymerization ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Acrylonitrile Butadiene Rubber ◽  
Radiation Induced

Effect of Bis (Diisopropyl) Thiophosphoryl Disulfide on the Co-Vulcanization of Carboxylic-Acrylonitrile-Butadiene Rubber and Ethylene-Propylene-Diene Rubber Blends

2002 ◽  
Vol 75 (2) ◽  
pp. 309-322 ◽  
Author(s):  
Nityananda Naskar ◽  
Subhas Chandra Debnath ◽  
Dipak Kumar Basu
Keyword(s):  
Physical Properties ◽  
Reaction Scheme ◽  
Butadiene Rubber ◽  
Two Stage ◽  
Reactive Compatibilization ◽  
Sem Micrographs ◽  
Rubber Blends ◽  
Acrylonitrile Butadiene Rubber ◽  
Vulcanization Process

Abstract The objective of the work is to prepare compatible, coherent and technologically feasible blends comprising non-polar EPDM rubber and polar carboxylic-acrylonitrile-butadiene rubber (XNBR). Using an efficient sulfur vulcanization system containing bis(diisopropyl) thiophosphoryl disulfide (DIPDIS), a coupling agent cum accelerator, EPDM-XNBR blend has been co-vulcanized. The blend vulcanizates thus produced exhibit substantially enhanced physical properties which are superior to those of either component. The compatibility of the rubber blends as judged by SEM micrographs can further be improved through a two-stage vulcanization process which promotes interphase crosslinking between the polymer phases. The interphase crosslinking was recognized from swelling experiments. The study of the blends containing carbon black reveals a profound increase in physical properties of the vulcanizates as compared to those of gum vulcanizates. The SEM micrographs of the blend vulcanizates both in one-stage and two-stage distinctly indicate the blend morphology, which accounts for the significant improvement in physical properties of EPDM-XNBR blends through in situ reactive compatibilization. A reaction scheme for the interphase crosslinking has been proposed for the co-curing of EPDM-XNBR blend.

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