Polyurethane

E mepụtara Polyurethane site na Bayer AG na Germany na 1937. N'ihi nchebe patent dị irè nke naịlọn n'oge ahụ, polyurethane ghọrọ ihe na-anọchi anya naịlọn ruo n'ókè ụfọdụ. A na-eji polyurethane eme ihe kemgbe afọ 1950, ọkachasị n'ụdị mgbasawanye (dị ka ụfụfụ polyurethane) maka akwa akwa na akwa akwa, ma ọ bụ maka imepụta eriri pụrụ iche dị ka lycra na spandex. Ntọala nke njikọ polyurethane bụ mmeghachi omume isocyanate. Njirimara a na-enye monomer ahụ nnukwu mmeghachi omume dị elu iji polymerize n'ime oge a na-anabata, ebe ọ na-ejigide inertia kinetic zuru oke maka mmeghachi omume dịka nucleophilic reagent ọgụ, iji kwe ka ojiji ya na-enweghị ọgwụgwọ pụrụ iche.
Ka ọ dị ugbu a, a na-ekewa polyurethane ndị a na-eji na ahụike ahụike na polyurethane na-adịghị emebi emebi. A na-emepụta polyurethane biodegradable site na aliphatic diisocyanate dị ka akụkụ siri ike na polyether polyol dị ka akụkụ dị nro, nke nwere ike imebi n'ime obere ụmụ irighiri ihe ndị nwere ike ịmịnye na metabolized site na ntule. A na-emepụta polyurethane na-adịghị emebi emebi site na toluene diisocyanate (TDI), diphenylmethyl diisocyanate (MDI) na diisocyanates aromatic ndị ọzọ, nke enwere ike iji dị ka ntinye ogologo oge na ahụ mmadụ.

Ya mere, enwere ike iji polyurethane ma na ntinye ahụike na-adịgide adịgide yana na usoro ndị na-achọ mmebi, dị ka stents na-emegharị anụ ahụ. Ọ bụ ezie na polyurethane nwere ikike dị ukwuu, ọ nwekwara ụfọdụ ọghọm: Achọpụtala ụfọdụ ngwaọrụ ndị na-adịghị emebi emebi n'oge, karịsịa catheter ndu, na-eweda oge iji mepụta carcinogens, dị ka ụfụfụ polyurethane nke a na-eji n'ịwa ahụ na-amụba ara, nke na-ebute ihe ize ndụ. carcinogenic amines, ọ bụ ezie na ihe ize ndụ a dị ntakịrị, ma ndị ọkà mmụta sayensị na ndị injinia na-aga n'ihu na-amụ otú e si ebelata ihe ize ndụ a.


Oge nzipu: 2023-08-28 10:34:14
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