Grafting of maleic anhydride onto polypropylene: Synthesis and characterization
ABSTRACT Isotactic polypropylene was grafted with maleic anhydride using benzoyl peroxide as an initiator and toluene as a solvent. Effects of various parameters such as monomer and initiator concentration, reaction time, and reaction temperature on percentage grafting were studied. Effect of various solvents on extent of grafting was also studied. The maximum extent of grafting achieved was 5.3%. The graft copolymers were characterized by i.r., thermal, viscometric, and contact angle studies. Improved thermal stability and decreased intrinsic viscosity and critical surface tension were observed for graft copolymers. © 1994 John Wiley & Sons, Inc.
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ABSTRACT: This review aims to present recent advances in the synthesis and structure characterization as well as the properties of polymer layered silicate nanocomposites. The advent of polymer layered silicate nanocomposites has revolutionized research into polymer composite materials. Nanocomposites are organic-inorganic hybrid materials in which at least one dimension of the filler is less than 100 nm. A number of synthesis routes have been developed in the recent years to prepare these materials, which include intercalation of polymers or pre-polymers from solution, in-situ polymerization, melt intercalation etc. The nanocomposites where the filler platelets can be dispersed in the polymer at the nanometer scale owing to the specific filler surface modifications, exhibit significant improvement in the composite properties, which include enhanced mechanical strength, gas barrier, thermal stability, flame retardancy etc. Only a small amount of filler is generally required for the enhancement in the properties, which helps the composite materials retain transparency and low density.Materials. 01/2009;
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ABSTRACT: Subcutaneous mycoses include diverse clinical syndromes, characterized by invasion of the skin and subcutaneous tissue by saprobic fungi. Individuals living in rural areas constantly suffer lesions or trauma; however, only a few of them develop disease. In this contribution, we describe recent advances in the understanding of the virulence of these organisms, focusing on the most prevalent infections, sporotrichosis, chromoblastomycosis, and mycetoma. Although these infectious diseases are considered neglected tropical diseases, modern molecular techniques have been able to identify the etiologic agents and observe variations in the former monolithic concept of the species, which was based mostly on morphologic characteristics. The complete genetic characterization of the causative agents, along with that of their host, will help in the understanding of the factors on which the development of these infections depends.Clinics in dermatology 07/2012; 30(4):382-8. · 3.11 Impact Factor
Chapter: BIODEGRADABLE PLASTIC FROM BLOOD[Show abstract] [Hide abstract]
ABSTRACT: Most of today's synthetic polymers are produced from petrochemicals and these persistent polymer waste is evoking more concern regarding its environmental impact. Globally, 2.5 to 4 billion tons of waste was generated in 2006 and recycling is expensive, therefore an alternative solution is needed to solves this serious problems . In the search for sustainable materials from non-potential food sources, bloodmeal is one of the best candidates for bioplastic manufacture. It is one of the highest non-synthetic sources of nitrogen coming from meat.Meat is New Zealand's second-largest food export and is worth $5.14 billion. From the plastics industry's point of view, developing improved blended materials is a much more effective and cheaper compared to synthesizing new polymers. Blending reduces the number of different grades that need to be manufactured and stored, resulting in space and capital investment reduction.03/2013: pages 154; , ISBN: 978-0-475-12403-6