Rani, Joseph(Wiley lnterScience, September 4, 2006)
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Abstract:
The latex industry has expanded over the
years to meet the world demands for gloves, condoms,
latex thread etc. Because of the strict specifications for
the products and the unstable nature of the latex, as
high as 15%, of the final latex products are rejected.
Since waste latex rubber (WLR) represents a source of
high quality rubber hydrocarbon, it is a potential candidate
for generating reclaimed rubber of superior quality.
Two types of WLR with different amounts of polysulfidic
bridges are used in these experiments, which are
reclaimed with variation of the concentration of the
reclaiming agents, the reclamation temperature and time,
Di phenyldisultide, 2-aminophenyldisulfide and 2,2'-dibenzamidodiphenyldisulfide
(DBADPDS) are used as reclaiming
agents, and the effect of diphenyldisulfides (DPDS)
with different substituents, on the reclamation efficiency of WLR is investigated. A kinetic study of the reclamation
reaction with the three reclaiming agents is done.
The reaction rates and activation energies are calculated
and compared with literature values. The comparative
study of the three different reclaiming agents shows that
(DBADPDS) is able to break the crosslinks at temperature
levels 20'C below the temperature levels normally
used with DPDS. Another advantage of this reclaiming
agent is the reduced smell during the reclamation process
and of the final reclaims, one of the most important
shortcomings of other disulfides used for this purpose.
Anantharaman, M R; Muhammad, Abdul Jamal E; Sakthi Kumar, D(Springer, December 22, 2008)
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Abstract:
Zinc aluminate nanoparticles with average particle size of 40 nm were synthesized using a sol–gel combustion
method. X-ray diffractometry result was analysed by Rietveld refinement method to establish the phase
purity of the material. Different stages of phase formation of the material during the synthesis were investigated
using differential scanning calorimetry and differential thermogravimetric analysis. Particle size was determined
with transmission electron microscopy and the optical bandgap of the nanoparticles was determined by absorption
spectroscopy in the ultraviolet-visible range. Dielectric permittivity and a.c. conductivity of the material were
measured for frequencies from 100 kHz to 8 MHz in the temperature range of 30–120◦C. The presence of Maxwell–
Wagner type interfacial polarization was found to exist in the material and hopping of electron by means of quantum
mechanical tunneling is attributed as the reason for the observed a.c. conductivity
Description:
Bull. Mater. Sci., Vol. 34, No. 2, April 2011, pp. 251–259
Sunil,K Narayanankutty(Taylor & Francis Inc., 2005)
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Abstract:
The rheological characteristics of short Nylon-6 fiber reinforced styrene butadiene
rubber (SBR) were studied using a capillary rheometer. The study was done with
respect to the effect of shear rate, fiber concentration, and temperature on shear
viscosity and die swell. All the melts showed pseudoplastic nature, which
decreased with increasing temperature. Shear viscosity increased in the presence
of fibers. Introduction of fiber reduces the temperature sensitivity of the rubber
matrix. A reduction in die swell was found in presence of fibers.