منابع مشابه
para-ARAMID FIBRILS
The term 'aramid fibre' refers to a manufactured fibre in which the fibre-forming substance is a long-chain synthetic polyamide with at least 85% of the amide linkages attached directly to two aromatic rings (Preston, 1978; Yang, 1993). 'para-Aramid fibres' are those in which the amide Iinkages are in the para (l,4) positions on the aromatic rings. para-Aramid fibres of poly(para-phenyleneterep...
متن کاملFlexural strength of heat-polymerized polymethyl methacrylate denture resin reinforced with glass, aramid, or nylon fibers.
STATEMENT OF PROBLEM Despite the favorable properties of conventional PMMA used as a denture base material, its fracture resistance could be improved. PURPOSE This in vitro study was performed to determine whether the flexural strength of a commercially available, heat-polymerized acrylic denture base material could be improved through reinforcement with 3 types of fibers. MATERIAL AND METH...
متن کاملAramid nanofiber-reinforced transparent nanocomposites
Nanoscale polymeric fibers are expected to bring about exceptional mechanical and optical properties in composite materials related to the better integration of different properties between fibers and polymers. The discovery of the first aramid nanofiber dispersion from commercial para-aramid macrofibers similar to Kevlar developed by DuPont allowed the emergence of an innovative nanoscale buil...
متن کاملThe inhalation toxicology of p-aramid fibrils.
The pandemic of lung disease caused by asbestos has cast suspicion on any industrial fibrous material that can become airborne in respirable form in workplaces, such that the respirable fibres might be inhaled. Fibre toxicology arose as a sub-specialty of particle toxicology to address the specialised nature of fibre effects and has evolved substantially in the last 25 years. It has yielded val...
متن کاملLung proliferative and clearance responses to inhaled para-aramid RFP in exposed hamsters and rats: comparisons with chrysotile asbestos fibers.
This study compared pulmonary effects of para-aramid respirable-sized, fiber-shaped particles (RFP) (p-aramid fibrils) and chrysotile asbestos fiber exposures in rats. Additional p-aramid inhalation studies were conducted in hamsters to compare species responses. The hamster results are preliminary. The parameters studied were clearance/biopersistence of inhaled p-aramid RFP or size-separated a...
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ژورنال
عنوان ژورنال: Sen'i Gakkaishi
سال: 1984
ISSN: 0037-9875,1884-2259
DOI: 10.2115/fiber.40.4-5_p356