The principal objective of this study was to explore the compatibility of a blend of
two synthetic elastomers viz., ethylene-propylene-diene rubber (EPDM) and
chlorobutyl rubber (CIIR). Various commercial grades of EPDM were blended
with a specific grade of CIIR at different proportions. The mechanical properties such
as tensile strength, tear strength, ageing resistance, etc. were studied. On the basis of
the observed physical properties, two particular grades of EPDM were found to be compatible
with CIIR. Differential scanning calorimetry and scanning electron microscopy
confirmed the results. Chlorosulphonated polyethylene was added as a compatibilizing
agent to overcome the phase separation of the other two incompatible grades of EPDM
in blending with CIIR. The results revealed that the addition of compatibilizer greatly
improves the compatibility and thereby the properties of the blends.
Rani, Joseph(Hutig & Wepf Verlag,Basel, October 5, 1987)
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Abstract:
Compounding of styrene-butadiene copolymer/polybutadiene , natural rubber/
ethylene-propylene-diene terpolymer and natural rubber/butadiene-acrylonitrile copolymer
blends was done in three different ways and their curing behaviour and the
tensile properties of the es are compared.
Natural rubber, styrene-butadiene rubber, and polybutadiene
rubber were used to replace part of the butadieneacrylonitrile
rubber in a 70/30 butadiene-acrylonitrile rubber/
poly(vinyl chloride) blend. Such replacement up to 15%
of the total weight of the blend improved the mechanical
properties, while decreasing the cost of the blend. Styrenebutadiene
rubber could replace butadiene-acrylonitrile
rubber up to 30% of the total weight of the blend without
deterioration in the mechanical properties.
Rani, Joseph(Gordon and Breach Science Publishers, Inc., May 20, 1985)
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Abstract:
Polychloroprene (neoprene) has been blended with polyvinylchloride (PVC) in different
proportions using a new stabiliser system (magnesium oxide and zinc oxide with
stearic acid) for PVC. The physical properties of the blends show that they can
advantageously replace neoprene in many applications.
Rani, Joseph(Gordon and Breach Science Publishers, Inc., November 28, 1986)
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Abstract:
Polymer-solvent interaction parameters for the blends of natural rubber (NR) with
styrene-butadiene rubber (SBR) and polybutadiene rubber ( BR) are calculated using
the Flory-Rehner equation by equating the network density of the vulcanizates in
two solvents.
Rani, Joseph(Hitthig & Wepf Verlag, Basel, October 13, 1986)
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Abstract:
A carbon black filled 50/50 natural rubber (NR)/styrene-butadiene rubber (SBR)
blend is vulcanized using several conventional curing systems designed by varying the
amounts of sulphur and accelerator. The cure characteristics and the properties of the
vulcanizates are compared. The quantity and quality of crosslinks in each case are
evaluated by chemical probes to correlate them with the properties.
Studies conducted on butadiene-acrylonitrile copolymer (NBR)/poly(vinyl chloride) (PVC)
blends at different temperatures indicate that an optimum temperature exists for the formation
of a particular blend. The mechanical properties of the blends confirm this observation.
PVC stabilizer based on, magnesium oxide , zinc oxide, and stearic acid was found to be very
useful in NBR/PVC blends.
Rani, Joseph(Gordon and Breach Science Publishers, Inc., November 13, 1986)
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Abstract:
A carbon black filled 50/50 Natural Rubber (NR)/Polybutadiene Rubber (BR) blend
is vulcanized using several conventional systems designed by varying the amounts of
sulphur and accelerator . The cure characteristics and the vulcanizate properties are
compared. The quality and quantity of crosslinks in each case are deciphered by
chemical probes to correlate them with the vulcanizate properties.