Characterization and properties of styrene butadiene rubber/recycled acrylonitrile-butadiene rubber (SBR/NBR) blends
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Date
2011
Authors
Zulkepli, Nik Noriman
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Abstract
The recycling or reuse of waste rubber from recycled acrylonitrile-butadiene
rubber glove (recycled NBR glove) by means of blending together with synthetic
rubber styrene butadiene rubber (SBR) can gives an opportunity as an alternative
product. Results in first series indicated that SBR/NBRr blends particularly having
NBRr content up to 15 phr, exhibited improvement in tensile strength, elongation at
break, Eb and fatigue value compared with SBR/NBRv blends. Meanwhile, in
second series SBRINBRr blends with the smallest size ofNBRr particles (Sl, 124-
334 f..tm) showed an improved overall cure characteristics and mechanical properties
compared with all other blend ratios contains of bigger sizes ofNBRr particles [0.85
- 15.0 mm (S2) and direct sheeted form (S3)]. At third series, addition of 5 phr of
trans-polyoctylene rubber (TOR) as compatibilizer improved the adhesion between
NBRr and the SBR matrix, thus improving the compatibility of SBRINBRr blends.
Most of cure characteristics and mechanical properties of compatibilised SBR/NBRr
blends were improved compared with uncompatibilised SBRINBRr blends.
Meanwhile in fourth series, the addition of 1 0 phr of epoxidized natural rubber
(ENR-50) also enhanced the compatibility of the SBRINBRr blends. Overall cure
characteristics and mechanical properties showed that SBRINBRr blends with the
presence of ENR-50 have lower t90, t2 and ML and improved the tensile strength,
hardness and thermal properties. At fifth series, the incorporation of Si69 has
improved the cure characteristics such as lower t90 and ML. Overall improvement on
mechanical properties such as tensile properties, fatigue and hardness of the blends
with Si69 were influenced by the degree of crosslinked density as the silica content
is increased. On sixth series the investigation on natural weathering test of all series
of SBR/NBRr blends showed weakening in overall properties particularly after 6
months exposure. However, most of the SBR/NBRr blends with modification
showed better tensile properties with variations of tensile retention.
Description
Keywords
Styrene butadiene rubber