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The polyurethane urea elastomer (PUU), or poly (urethane urea) elastomer, is a flexible polymeric material that is composed of linkages made out of polyurethane and polyurea compounds. Due to its hyperelastic properties, it is capable of bouncing back high-speed ballistic projectiles as if the material had “hardened” upon impact.
Urea or carbamide is an organic compound with the chemical formula (NH 2) 2 CO. The molecule has two amine groups (–NH 2) joined by a carbonyl functional group (C=O). In a polyurea, alternating monomer units of isocyanates and amines react with each other to form urea linkages.
Polyurethane urea elastomers have been investigated by researchers from the U.S. Army Research Laboratory and the Massachusetts Institute of Technology for potential material for helmets, face shields, and ballistic vests for soldiers. [18]
Polyurethane foam (including foam rubber) is sometimes made using small amounts of blowing agents to give less dense foam, better cushioning/energy absorption or thermal insulation. In the early 1990s, because of their impact on ozone depletion , the Montreal Protocol restricted the use of many chlorine -containing blowing agents, such as ...
Polyurethane urea elastomer; Prepolymer; R. Reticulated foam; S. Sorbothane; Spandex; Z. Zylon This page was last edited on 30 March 2013, at 02:05 (UTC). Text is ...
Chemical route to polyurethane polymer used in production of spandex. Spandex is mainly composed of a polyurea derived from the reaction of a diol and a diisocyanate. Two classes of spandex are defined by the "macrodiols". One class of macrodiols is the oligomer produced from tetrahydrofuran (i.e. polytetrahydrofuran).
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This page was last edited on 10 November 2020, at 11:59 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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