Polyvinyl Alcohol (PVA) yog cov dej tseem ceeb -soluble hluavtaws polymer tsim los ntawm alcoholysis lossis hydrolysis ntawm polyvinyl acetate (PVAc). Nws feem ntau tshwm li xim dawb mus rau daj ntseg- daj khoom nyob rau hauv daim ntawv ntawm granules, hmoov, los yog flocculent hais.'
Lub zog physicochemical ntawm PVA feem ntau nyob ntawm ob qhov tseem ceeb: qib ntawm polymerization (uas txiav txim siab qhov hnyav molecular) thiab qib ntawm alcoholysis (feem pua ntawm acetate pawg hloov los ntawm hydroxyl pawg). Kev sib cuam tshuam ntawm ob qhov kev ntsuas no ua rau muaj ntau yam kev sib txawv ntawm cov khoom: PVA nthuav tawm ntau yam ntawm cov yam ntxwv, xws li solubility hauv dej txias kom xav tau dej kub rau kev sib cais, thiab los ntawm kev hloov pauv mus rau siab tensile zog. Tsis tas li ntawd, nws muaj cov yeeb yaj kiab zoo heev - tsim muaj peev xwm, nplaum lub zog, emulsifying stability, thiab tshwj xeeb biocompatibility; nws kuj tsis yog - lom, tsis muaj ntxhiab, thiab ib puag ncig tus phooj ywg.
Raws li cov yam ntxwv no, PVA tau tshwm sim los ua cov khoom siv tshuaj lom neeg ntau yam. Nws ua haujlwm tsis yog tsuas yog cov khoom siv hauv paus rau textile sizing agents, siab -kev ua tau zoo adhesives, cov ntaub ntawv kho cov neeg ua haujlwm, thiab ntim cov yeeb yaj kiab, tab sis kuj tseem siv rau hauv biomedical fields-xws li cov kws kho mob, kev hnav khaub ncaws kho mob, thiab cov ntaub so ntswg engineering scaffolds-vim nws zoo heev biocompatibility. Los ntawm kev lag luam ib txwm mus rau pem hauv ntej ntawm cov cuab yeej siv siab, PVA plays lub luag haujlwm tseem ceeb.