Sasidharan, K K; Dr. Thomas, Kurian; Dr. Rosamma, Alex(Cochin University of Science And Technology, February , 2014)
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Abstract:
Sensitisation of natural rubber latex by addition of a small quantity of
an anionic surfactant prior to the addition of a coacervant results in quick
coagulation. The natural rubber prepared by the novel coagulation method
shows improved raw rubber characteristics, better cure characteristics in
gum and carbon black filled compounds and improved mechanical
properties as compared to the conventionally coagulated natural rubber.
Compounds based on dried masterbatches prepared by the incorporation of
fluffy carbon black in different forms of soap sensitised natural rubber
latices such as fresh latex, preserved field latex, centrifuged latex and a
blend of preserved field latex and skim latex show improved cure
characteristics and vucanizate properties as compared to an equivalent
conventional dry rubber-fluffy carbon black based compound.
The latex masterbatch based vulcanizates show higher level of
crosslinking and better dispersion of filler. Vulcanizates based on fresh
natural rubber latex- dual filler masterbatches containing a blend of carbon
black and silica prepared by the modified coagulation process shows very
good mechanical and dynamic properties that could be correlated to a low
rolling resistance. The carbon black/silica/nanoclay tri-filler - fresh natural
rubber latex masterbatch based vulcanizates show improved mechanical
properties as the proportion of nanoclay increased up to 5 phr.
The fresh natural rubber latex based carbon black-silica masterbatch/
polybutadiene blend vulcanizates show superior mechanical and dynamic
properties as compared to the equivalent compound vulcanizates prepared
from the dry natural rubber-filler (conventional dry mix)/polybutadiene blends
Description:
Department of Polymer Science and Rubber Technology
Cochin University of Science and Technology
Rani, Joseph(OPA (Overseas Publishers Association), July 15, 1994)
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Abstract:
The mechanical properties of filled natural rubber latex vulcanizates were found to be improved by the
addition of polyethylene glycols of different molecular weight and glycerol. There is a slight reduction
in the optimum cure times of the compounds containing PEG/Glycerol. The morphology study shows
that the filler distribution is more uniform in the compounds containing PEG/Glycerol.