Rani, Joseph; Dr.Joseph,Francis D(Cochin University of Science and Technology, December , 1987)
[+]
[-]
Abstract:
There are a large number of commercial examples and property advantages of immiscible elastomer blends.73 Blends of natural rubber (NR) and polybutadiene (BR) have shown various
advantages including heat stability, improved elasticity and abrasion resistance. Ethylene-propylene-diene-rubber (EPDM) blended with styrene-butadiene rubber (SBR) has shown improvements in ozone and chemical resistance with better compression set properties. Blends of EPDM and nitrile rubber (NBR) have been cited as a compromise for obtaining moderate oil and ozone resistance with improved low temperature properties. Neoprene (CR)/BR blends offer improved low temperature properties and abrasion resistance with better processing characteristics etc. However, in many of the commercial two-phase elastomer blends, segregation of the crosslinking agents, carbon black or antioxidants preferentially into one phase
can result in failure to attain optimum properties. Soluble and insoluble compounding ingredients are found to be preferentially concentrated in one phase. The balance of optimum curing of both phases therefore presents a difficult problem. It has been the aim of this study to improve the
performance of commercially important elastomer blends such as natural rubber (NR)/styrene-butadiene rubber (SBR) and natural rubber/polybutadiene rubber (BR) by industrially viable procedures
Description:
Department Of Polymer Science And Rubber technology
Thomas,E V; Dr.Joseph,Francis D(Cochin University of Science And Technology, April , 1985)
[+]
[-]
Abstract:
Although the physical and technological properties
of modified rubbers were compared with those of conventional
rubbers in the earlier studies reviewed above, the extent of
energy saving possible by their use has not been quantified.
In the present work it is proposed to determine the energy
saving possible by using the following forms of natural rubber:
1. Oil extended natural rubber, 2. peptised natural rubber,
3. latex stage compounds. The process of production and
quality control of the above types of processed rubbers are
proposed to be standardised. It is also planned to work out
a methodology for utilising field coagula for production of
constant viscosity rubbers. The variation in processing
properties of rubber from popular Indian clones will be examined and those with energy advantages in the processing
stage will be identified. In conclusion a recommendation for
adoption of a commercially advantageous processing procedure
among Indian rubber plantation industry is also given.
Description:
Polymer science & rubber technology, Cochin University of Science And Technology