Abstract
Blending of polymers has gained much interest due to the fact that, it can be used to produce new polymeric materials with specific properties suitable for some special applications. The blends from acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR) and polyvinyl chloride (PVC) has been designed for products working in contact with oils. The characteristics of the designed blends either binary blends (NBR/PVC or PVC/CR) or ternary blends (NBR/ PVC/CR) were investigated by rheological properties, mechanical analysis and swelling in oil and toluene. It was found that the incorporation of PVC in the blend compositions leads to the decrease in degree of swelling, the penetration rate and the average diffusion coefficient. On the other hand the ultimate tensile strength (UTS), the hardness and strain energy were increased. This was attributed to the plastic nature of PVC, beside its additional behavior as filler. The crosslinking density in the blend vulcanizates under investigations was determined by Flory-Rehner and Mooney-Rivlin [Stress/Strain] equations. The higher values of crosslinking density determined by Mooney-Rivlin can be attributed to the additional physical crosslinks (e.g. entanglements etc), beside the chemical crosslinks determined by swelling in toluene. This study showed that NBR/PVC blends are characterized with high performance oil resistant, which can be recommended to automotive industry.
Highlights
It is possible to get new materials with improved properties by blending elastomers and plastics
This study showed that NBR/polyvinyl chloride (PVC) blends are characterized with high performance oil resistant, which can be recommended to automotive industry
The present work is aiming to elaborate high performance oil resistant rubber products based on NBR, PVC and CR blends to be utilized in automobiles industry
Summary
It is possible to get new materials with improved properties by blending elastomers and plastics. One of the most common blends in modern science is polyvinyl chloride (PVC) with acrylonitrile butadiene rubber (NBR) [1,2]. NBR/PVC blends can be conventionally milled, extruded, or compression molded using traditional processing equipments for natural and synthetic rubbers [4]. Wimolmala et al [6] blended (PVC) with NBR over a range of compositions (5wt% to 40wt% of rubber). Omran et al studied different rubber blends based NBR and PVC and found that NBR/PVC blends had excellent engine and hydraulic oils resistance [11]. The present work is aiming to elaborate high performance oil resistant rubber products based on NBR, PVC and CR blends to be utilized in automobiles industry. The blend vulcanizates are evaluated by rheological, physical and mechanical characteristics
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