The properties of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends
The effects of cure characteristics, physical and mechanical properties and morphological properties on styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends were investigated. SBR/CRr blends with blend ratios 95/5, 85/15, 75/25, 65/35 and 50/50 were prepared using two roll mill a...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/42885/1/P.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/42885/2/Full%20Text.pdf |
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| Summary: | The effects of cure characteristics, physical and mechanical properties and
morphological properties on styrene butadiene rubber/recycled chloroprene rubber
(SBR/CRr) blends were investigated. SBR/CRr blends with blend ratios 95/5, 85/15,
75/25, 65/35 and 50/50 were prepared using two roll mill at room temperature and
followed by compression moulding. The results on comparison of styrene butadiene
rubber/virgin chloroprene rubber (SBR/CRv) blends with SBR/CRr blends showed that
at similar blend ratios, particularly up to 15 phr, SBR/CRr blends exhibited
improvement in tensile strength while the M100, hardness and crosslink density of
SBR/CRr blends exhibited increment value in all blend ratios. The smallest size of CRr
particles S1 (346-486 μm) in SBR/CRr blends showed a better cure characteristics and
mechanical properties compared with all other blend ratios in S2 (664-891 μm) and S3
(0.3-0.7 mm). Futhermore, the processing become more efficient and the contact surface
area increased which provided more efficient interfacial bonds. The compatibilization of
SBR/CRr blends with 5 phr of trans-polyoctylene rubber (TOR) improved the adhesion between CRr and the SBR matrix, thus, improving the compatibility of SBR/CRr
blends. Cure characteristics of compatibilised SBR/CRr blend have shorter scorch time,
t2 and cure time, t90 than uncompatibilised SBR/CRr blends. Compatibilised SBR/CRr
blends showed lower minimum torque (ML) compared to uncompatibilised SBR/CRr
blends at all blend ratios. However, maximum torque (MH) of compatibilised SBR/CRr
blends exhibit the opposite trend compared with the uncompatibilised SBR/CRr blends.
The tensile strength, M100, hardness and crosslink density of compatibilised SBR/CRr
blends also improved compared with uncompatibilised SBR/CRr blends. The cure time,
t90 of SBR/CRr/CB blends and SBR/CRr/CaCO3 blends decreased with increasing CRr
content in both blends. However, scorch time, t2, increased with increasing CRr content
in both blends. SBR/CRr/CB blends showed higher minimum torque (ML) compared to
SBR/CRr/CaCO3 blends at all blend ratios. However, maximum torque (MH) of
SBR/CRr/CB blends exhibit the opposite trend compared with the SBR/CRr/CaCO3
blends. SBR/CRr/CB blends exhibited a better result in all mechanical and physical
properties compared with SBR/CRr/CaCO3 blends at all blend ratios. |
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