Characterization And Properties Of Natural Rubber/Recycled Acrylonitrile-Butadiene Rubber Blends
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Date
2018-12-01
Authors
Ahmad @ Sofa, Hazwani Syaza
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
In this study, five series of formulations have been used to study the effects of
recycled acrylonitrile-butadiene rubber glove (NBRr) blending together with natural
rubber (NR). Cure characteristics, tensile test, hardness and resilience tests, crosslink
density test, fatigue test, thermal analysis, and Fourier transform infrared (FTIR)
analysis were carried out on these five series. Morphology of failure surface was
analyzed using Scanning electron microscopy (SEM). In the first series, natural
rubber/virgin acrylonitrile-butadiene rubber (NR/NBRv) blends showed better cure
characteristics and mechanical properties compared with NR/NBRr blends.
However, NR/NBRr blends showed a better result on some properties such as higher
modulus and hardness, and less solvent uptake. ENR-50 and EVA was added into the
NR/NBRr blends as compatibilizers in the second and third series. Result indicated
cure characteristics and mechanical properties of compatibilized NR/NBRr blends
were improved compared with uncompatibilized NR/NBRr blends. However,
addition of ENR-50 into NR/NBRr blends showed better cure characteristics and
mechanical properties in terms of scorch time, tensile strength, modulus, hardness,
and solvent uptake compared with NR/NBRr blends with EVA. It had been proven
by SEM micrograph of failure surface which shown addition of compatibilizer
enhanced the compatibility of NR/NBRr blends. Further study of ENR-50/NBRr
blends was carried out in the fourth series. Results show that cure characteristics and
mechanical properties improved for all blends compared with NR/NBRr blends.
Blending ENR-50 with NBRr gives better compatibility and strong interfacial
adhesion between ENR-50 and NBRr. On the fifth series the effects of different
crosslinking system which are sulphur (S), dicumyl peroxide (DCP), and mixed
system (S+DCP) on NR/NBRr blends were carried out. The sulphur system show the
best cure characteristics compared to peroxide and mixed systems, while the mixed
system show the best mechanical and physical properties compared to sulphur and
peroxide systems at all blend ratios.