Blister ntim tshuab blister PVC iav hloov kub

Hauv qab iav hloov pauv kub (Tg, 80 degree), polyvinyl chloride nyob rau hauv lub khob iav; ntawm Tg → viscous flow kub (Tf, txog 160 degree), nws yog elastic heev thiab rubbery; ntawm Tf → thermal decomposition kub (Td) Rau lub viscous flow xeev, qhov siab dua qhov kub, qhov yooj yim ntws. Thaum qhov kub siab tshaj Td, PVC decomposes ib tug loj npaum li cas ntawm hydrogen chloride (HCl), thiab cov khoom poob nws cov tshuaj stability thiab lub cev muaj zog, yog li Td yog lub sab sauv txwv kub rau ua. Vim yog lub zog loj ntawm polyethylene, Tf yog siab heev, txawm tias ze rau qhov decomposition kub, yog li nws yog ib qho tsim nyog yuav tau ntxiv cov yas yas kom txo Tf. Ntawm qhov tod tes, nws tseem yuav tsum tau ntxiv cov stabilizers kom nce Td ntawm PVC ua ntej ua thiab molding.