1. Rigid PVC yog ib qho ntawm cov khoom siv yas siv dav tshaj plaws.
2. Lub melting kub ntawm PVC thaum lub sij hawm ua yog ib tug txheej txheem tseem ceeb heev parameter. Yog tias qhov ntsuas no tsis raug, nws yuav ua rau muaj teeb meem ntawm cov khoom decomposition. Cov yam ntxwv ntws ntawm PVC yog qhov tsis zoo, thiab nws cov txheej txheem yog nqaim heev. Tshwj xeeb, cov ntaub ntawv PVC nrog qhov hnyav molecular hnyav dua yog qhov nyuaj rau kev ua haujlwm (cov ntaub ntawv no feem ntau yuav tsum tau ntxiv cov roj nplua nyeem los txhim kho cov yam ntxwv ntws), yog li cov ntaub ntawv PVC uas muaj qhov hnyav molecular feem ntau yog siv. Lub shrinkage ntawm PVC yog tsawg heev, feem ntau yog 0.2 ~ 0.6%.
3. PVC tuaj yeem muab faib ua PVC tawv thiab mos PVC. Ntawm lawv, nyuaj PVC nyiaj txog li 2/3 ntawm kev ua lag luam thiab muag PVC nyiaj rau 1/3. Mos PVC feem ntau yog siv rau hauv pem teb, qab nthab thiab tawv nto. Txawm li cas los xij, vim tias PVC mos muaj cov khoom siv softener (uas kuj yog qhov sib txawv ntawm cov mos PVC thiab tawv PVC), nws yooj yim los ua nkig thiab nyuaj rau khaws cia, yog li nws txoj kev siv yog txwv. Hard PVC tsis muaj softener, yog li nws hloov tau yooj yim, tsim tau yooj yim, tsis tawg, tsis muaj kuab lom thiab tsis muaj kuab paug, thiab muaj lub sijhawm cia ntev, yog li nws muaj kev txhim kho zoo thiab daim ntawv thov. Mos PVC feem ntau yog siv los ua lub tshuab nqus tsev yas zaj duab xis rau saum npoo ntim ntawm ntau lub vaj huam sib luag, yog li nws tseem hu ua cov yeeb yaj kiab zoo nkauj thiab cov nplaum nplaum, thiab siv rau hauv cov khoom siv hauv tsev, ntim khoom, tshuaj thiab ntau lwm yam lag luam. Ntawm lawv, kev lag luam khoom siv hauv tsev suav nrog qhov loj tshaj plaws, 60%, ua raws li kev lag luam ntim khoom, nrog rau ntau qhov kev siv me me.
4. PVC yog tiag tiag vinyl polymer, thiab nws cov khoom yog cov khoom siv amorphous. Hauv kev siv tiag tiag, cov ntaub ntawv PVC feem ntau ntxiv nrog cov stabilizers, lubricants, auxiliary processing agents, pigments, impact agents and other additives. Nws muaj tsis muaj flammability, siab zog, huab cua tsis kam thiab zoo heev geometric stability. PVC muaj zog tiv thaiv oxidants, txo cov neeg ua haujlwm thiab muaj zog acids. Txawm li cas los xij, nws tuaj yeem raug corroded los ntawm cov concentrated oxidizing acids, xws li concentrated sulfuric acid thiab concentrated nitric acid, thiab tsis haum rau kev sib cuag nrog cov ntxhiab hydrocarbons thiab chlorinated hydrocarbons.
