Cov kws ua cov txheej txheem, cov nplaum, cov khoom siv roj hmab, thiab cov ntaub ntawv elastic (rooj plaub), siv cov neeg siv roj ntau ntxiv rau cov khoom lag luam tshwj xeeb. Cov polyols suav nrog polytetramethylene __her glycols (pephlate {{1} {{1} {{1}-
Xaiv cov polyol zoo tshaj plaws rau cov mis tshwj xeeb tuaj yeem yog qhov sib txawv ntawm kev ua lub siab {{0} -}}}}}}}} ua hauj lwm muab. Tus yuam sij rau kev xaiv kom tsim nyog yog qhov kev nkag siab zoo ntawm cov yam ntxwv ntawm txhua tus kab ke ntawm kev lag luam ntawm cov lag luam ntawm pawg Ganrade. PTmeg yog thawj polyol siv nyob rau hauv high - kev ua haujlwm polyurethane elastomers. Ptmeg -} Raws cov polyurethanes yog paub txog cov yam ntxwv kub thiab txias, cov yam ntxwv zoo thiab zoo dua qub.
Kev ua tau zoo ntawmPolyols rau rooj plaubCov Ntawv Thov
-}} indive crystallization ntawm ptmeg si segments, muaj cov txiaj ntsig me me thiab cov accompretic cov khoom siv ntawm cov polyurethane elastomers. Cov xwm txheej no ua rau ptmeg cov khoom siv ntawm kev xaiv rau cov processment tshwj xeeb hauv cov log, txoj sia, lub log tsheb, thiab ntau lwm yam khoom lag luam.
Piv nrog polyester - Hom POLYURETHES, PPG {{polyeth- Polyether Polyols Kuj thiab cov khoom kub tsawg. Txawm li cas los xij, thaum piv nrog PTMEG thiab Polyester Polyols, PPG Polyols muaj cov khoom siv hluav taws xob qis dua thiab muaj ntau dua rau thermo {}} oxidative degradation.
Nyob rau hauv sib piv rau PPG Polyols, Polyester polyols muaj cov yam ntxwv zoo dua, xws li tensile thiab ntuag lub zog tsis kam. Polyester Polyols yog cov tshuaj tiv thaiv cov khoom lag luam ntawm dicarboxylic acids thiab diols, thiab polyester segments tuaj yeem yog crystalline lossis amorphod. Cov polyesters no yog tiv taus cov roj, roj, cov kuab tshuaj, thiab oxidation.
Lub Policaprolactone polyols kev nthuav qhia qis dua melt vascosities, qhov nqaim molecular hnyav uas faib tawm uas txhim kho lawv cov hydrolytic ruaj khov. Polycarbonate polyols yog tsiag ntawv los ntawm kev kub zoo dua thiab noo noo tsis kam thiab noo polyols.