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Abstract:
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The thesis deals with the development of short nylon fiber-reclaimed
rubber/elastomer composites. Three rubbers viz, natural
rubber, acrylonitrile butadiene rubber and styrene butadiene rubber
were selected and were partially replaced with reclaimed rubber.
The blend ratio was optimized with respect to cure characteristics
and mechanical properties. Reclaimed rubber replaced 40 parts of
NR and SBR and 20 parts of NBR without much affecting the
properties. These blends were then reinforced with short nylon
fibers. The mechanical properties of the composites were studied
in detail. In all the cases the tensile strength, tear strength and the
abrasion resistance increased with increase in fiber content. In the
case of NRlreclaimed rubber blends, the tensile strength-fiberloading
relationship was non-linear where as in the case of
NBRlreclaimed rubber blends and SBRlreclaimed rubber blends
the tensile strength-fiber loading relationship was linear. All the
composites showed anisotropy in mechanical properties. The effect
of bonding system on the composite properties was also studied
with respect to cure characteristics and mechanical properties. For
this, a 20 phr fiber loaded reclaimed rubber/elastomer composites
were selected and the effect of MDI/PEG resin system was studied.
The resin used was 5 phr and the resin ratios used were 0.67: I, 1:1,
1.5:1 and 2:1. The bonding system improved the tensile strength,
tear strength and abrasion resistance. The best results are with
SBRlreclaimed rubber-short nylon fiber composites. The
optimized resin ratio was 1:1 MDI/PEG for all the composites. |