Dr Rani Joseph
http://dyuthi.cusat.ac.in:8080/xmlui/handle/purl/491
2024-02-07T21:25:45ZCompatibility Studies on Sulphur Cured EPDM/CIIR Blends
http://dyuthi.cusat.ac.in:8080/xmlui/handle/purl/2001
Compatibility Studies on Sulphur Cured EPDM/CIIR Blends
Therattil, Sunil Jose; Kuzhuppully, Anoop Anand; Rani, Joseph
The principal objective of this study was to explore the compatibility of a blend of
two synthetic elastomers viz., ethylene-propylene-diene rubber (EPDM) and
chlorobutyl rubber (CIIR). Various commercial grades of EPDM were blended
with a specific grade of CIIR at different proportions. The mechanical properties such
as tensile strength, tear strength, ageing resistance, etc. were studied. On the basis of
the observed physical properties, two particular grades of EPDM were found to be compatible
with CIIR. Differential scanning calorimetry and scanning electron microscopy
confirmed the results. Chlorosulphonated polyethylene was added as a compatibilizing
agent to overcome the phase separation of the other two incompatible grades of EPDM
in blending with CIIR. The results revealed that the addition of compatibilizer greatly
improves the compatibility and thereby the properties of the blends.
2008-01-01T00:00:00ZPreparation of Low-Protein Natural Rubber Latex: Effect of Polyethylene Glycol
http://dyuthi.cusat.ac.in:8080/xmlui/handle/purl/2000
Preparation of Low-Protein Natural Rubber Latex: Effect of Polyethylene Glycol
Rani, Joseph; Abhilash, G; Sabharwal, S; Dubey, Abhinav; Paul, Jose; John, Honey
Low-protein content natural rubber latex
was produced by using a nonionic surfactant-polyethylene
glycol (PEG). Extractable protein content of natural rubber
latex was found to decrease with PEG treatment and
reduction increased with increase in the molecular weight
of PEG. The low-protein latex samples were characterized
by tensile testing, Fourier transform infrared and thermogravimetric
analysis. The results have shown 35% reduction in the extractable protein content, without any compromise
on the mechanical properties of the latex; however,
thermal stability of low-protein latex was found to be
reduced marginally with PEG treatment.
2009-01-01T00:00:00ZRubber Seed Oil: A Multipurpose Additive in NR and SBR Compounds
http://dyuthi.cusat.ac.in:8080/xmlui/handle/purl/871
Rubber Seed Oil: A Multipurpose Additive in NR and SBR Compounds
Rani, Joseph
ABSTRACT: Rubber seed oil was used as a multipurpose ingredient in natural rubber
(NR) and styrene butadiene rubber (SBR) compounds. The study shows that the oil,
when substituted for conventional plasticiser, imparts excellent mechanical properties
to NR and SBR vulcanizates. Further, it also improves aging resistance, reduces cure
time, increases abrasion resistance and flex resistance, and reduces blooming.
1998-08-20T00:00:00ZXanthate Accelerators for Low Temperature Curing of Natural Rubber
http://dyuthi.cusat.ac.in:8080/xmlui/handle/purl/870
Xanthate Accelerators for Low Temperature Curing of Natural Rubber
Rani, Joseph
ABSTRACT: Zinc salts of ethyl, isopropyl, and butyl xanthates were prepared in the
laboratory. They were purified by reprecipitation and were characterized by IR, NMR,
and thermogravimetric analysis techniques. The melting points were also determined.
The rubber compounds with different xanthate accelerators were cured at temperatures
from 30 to 150°C. The sheets were molded and properties such as tensile strength,
tear strength, crosslink density, elongation at break, and modulus at 300% elongation
were evaluated. The properties showed that all three xanthate accelerators are effective
for room temperature curing.
2000-03-20T00:00:00Z