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May 08, 2015Open Access
Recycling is a crucial area of research in Green Polymer Chemistry and
developments in recycling are driven by environmental concerns, interests in
sustainability and desire to decrease dependence on petroleum based materials.
Sustainability refers to the development that meets the needs of present
without comprising the ability of future generations. Polyurethane foams (PU)
are widely used due to their light weight and superior heat insulation as well
as good mechanical properties. However, lar...
Apr 30, 2015Open Access
The task was to find out the most appropriate expandable graphite
intercalation compound GIC for intumescent seals. The application in fire seals
required GICs, which exerted high expansion at low burning rates. Therefore
graphite was treated with nitric, sulphuric, phosphoric acids and ferric
chloride. Phosphoric acid with its flame retardant properties was the
favourite, but graphite treated with it, did not exfoliate, therefore
expandable graphite was post treated with phosphoric acid. Elemen...
Oct 06, 2014Open Access
The use of polyamide coatings for electrical
applications is restricted mainly because of its inadequate flame retardant
behaviour. In order to improve its flame retardant behaviour, polyamide is
modified by incorporating phosphorus moiety in its backbone. The structure of
the phosphorus and poly amide was confirmed by infrared spectroscopy (FT-IR),
NMR, thermo gravimetric analysis (TGA), differential scanning calorimetry
(DSC), UL-94 vertical burning tests and char residue tests. From the resul...
Sep 23, 2014Open Access
The present work reports the oxidative synthesis of poly aniline using K2Cr2O7 as an oxidizing agent and H2SO4 as dopant. The
synthesized polymer was characterized by solubility test and UV- visible spectroscopic
technique. The synthesized polymer (poly aniline) was insoluble in ethanol,
acetone, benzene and water. The absorbance of UV-visible spectra shows two
reductive peaks at some wake length. The band ob ...
Sep 22, 2014Open Access
The PANI-PVA composite films adopting PVA as the base material and doped
with hydrochloride, DBSA, amino sulfonic acid aqueous solution were prepared
and their conductivity was compared. Among these PANI-PVA composite films, the
conductivity of HCl-PANI-PVA film is the highest. At the same time, the influences
of mass ratio between PANI and PVA, acid content, oxidant content, reaction
time and drying temperature of film on the conductivity of HCl-PANI-PVA film
we ...
Sep 19, 2014Open Access
In this paper morphological transformation of sisal fiber by graft
copolymerization with methyl acrylate and its binary mixture with acrylic acid
(AAc), vinyl acetate (VA) and n-butyl
acrylate (BuA), using FAS-KPS initiator, under influence of microwave radiations
has been reported. Optimum reaction conditions for maximum graft yield were
kept same as that in case of grafting of principal monomer. Maximum grafting
has been observed in case of sisal-g-poly(MA VA). The Graft copolymers thus...
Aug 20, 2014Open Access
Blend film of polyvinyl
alcohol (PVA) based gelatin was prepared by mixing aqueous solutions of both samples.
The mixed aqueous solutions of both samples in different ratios (P1, P2, P3, P4
and P5) were then cast onto silicon paper covered glass plate to form film.
These films were then irradiated under gamma radiation (60Co) with
different intensities (total dose) like 50, 100, 150, 250 and 500 krad to
investigate the irradiation effect on the mechanical proper ...
Aug 08, 2014Open Access
New regulations for hazardous air pollutants drove operations to
compliant coatings. Powder coatings were the most popular choice. A screening
of intumescent powder coatings was carried out comprising binders like
thermoplastics as plasticised polyvinylchloride and polypropylene as well as
non-cross linked thermosets as polyurethanes. Intumescence was achieved by
addition of the intumescent ingredient bicyclopentaerythritol phosphate, by the intumescent
...
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