Cov txheej txheem yas ntawm cov yas hauv cov yas tuaj yeem suav tias yog txheej txheem uas cov yas thiab cov yas uas tsis muaj cov tshuaj sib tov sib xyaw sib xyaw sib xyaw, tab sis cov yas yog txawv ntawm cov kuab tshuaj. Cov kuab tshuaj yuav ua kom tawg thaum lub sijhawm ua haujlwm, thaum cov yas yuav tsum tau nyob hauv cov polymer ntev thiab tsis ua tshuaj lom nrog cov tshuaj, ua kom muaj zog nrog cov tshuaj. Tom qab cov yas yas ntxiv, nws tuaj yeem ua rau cov yas' kev yoog raws, hloov pauv, tiv taus txias, thiab ua kom ntev. Txo cov yas' hardness, modulus, iav hloov pauv kub, yaj yaj, softening kub, lossis kub tsawg, yog li ntawd cov viscosity ntawm cov yas ua me dua thiab cov dej ntws nce, yog li txhim kho kev ua tiav.
Cov txheej txheem yas ntawm cov yas yas feem ntau txiav txim siab kom muaj ob hom hauv qab no:
1) Thaum cov yas thiab cov yas yaj ua ke, cov molecules me me ntawm cov yas yuav muab tso rau nruab nrab ntawm cov saw hlau molecular, ua rau lub zog tsis muaj zog ntawm cov saw polymer molecular saw thiab nce qhov nrug ntawm lawv, vim li ntawd, Nws nce kev txav mus los ntawm polymer molecular chains thiab txo qis kev cuam tshuam ntawm cov polymer molecular saw kom cov resin tuaj yeem hla iav hloov pauv ntawm qhov kub qis dua, yog li ua rau cov yas ntawm cov yas. Nws tuaj yeem pom tias lub zog nqus thiab cuam tshuam ntawm cov saw hlau molecular yog qhov ua rau tiv thaiv yas.
2) Cov polymer' cov qauv txheej txheem molecular tseem cuam tshuam rau kev nyiam ntawm cov saw polymer molecular, tshwj xeeb tshaj yog cov khoom ntawm pab pawg ntawm cov saw polymer molecular. Kev sib cuam tshuam ntawm cov saw hlau sib txuas nrog cov pab pawg ncov qaumteb muaj zog loj, thiab muaj cov pab pawg tsis-ncov qaumteb qabteb. Lub zog nruab nrab ntawm cov saw molecular yog me me. Txhawm rau ua cov polymer nrog cov pab pawg muaj zog ncov qaum kom yooj yim, cov yas tuaj yeem ntxiv tau. Cov pab pawg ncov qaumteb qabteb ntawm cov yas yuav cuam tshuam nrog pab pawg ncov qaumteb qabteb ntawm cov polymer, yog li ua kom tsis muaj zog nrog kev nyiam ntawm cov polymers, lub hom phiaj ntawm kev ua yas yog ua tiav.
Nws tuaj yeem pom los ntawm cov lus saum toj no uas yog tus yuam sij rau lub tshuab yas' cov yas ua kom muaj zog yog ua kom lub zog quab yuam ntawm cov polymers.