Cov ntaub ntawv dab tsi yog Cov Plastic Ntim Cov Thawv Ua Los Ntawm?

Cov khoom tseem ceeb ntawm cov thawv ntim yas yog cov khoom siv hluavtaws. Lub sij hawm resin yog Ameslikas lub npe tom qab lipids secreted los ntawm cov tsiaj thiab nroj tsuag, xws li rosin, shellac, thiab lwm yam. Tam sim no, resin yog hais txog polymers uas tsis tau tov nrog ntau yam additives. Resin account rau kwv yees li 40% mus rau 100% ntawm tag nrho cov hnyav ntawm cov yas. Cov khoom tseem ceeb ntawm cov thawv ntim yas yog txiav txim siab los ntawm qhov xwm txheej ntawm cov resin, tab sis cov khoom ntxiv kuj ua lub luag haujlwm tseem ceeb. Qee lub thawv ntim yas yog tsim los ntawm cov khoom siv hluavtaws uas tsis muaj lossis tsawg dua ntxiv, xws li plexiglass, polystyrene, thiab lwm yam.
Feem ntau muaj ob hom polymer cov qauv hauv cov thawv ntim yas:
Thawj yog cov qauv linear, thiab cov khoom siv polymer nrog cov qauv no hu ua linear polymer compounds.
Qhov thib ob yog lub cev qauv. Polymer compounds nrog cov qauv no yog hu ua lub cev hom polymer compounds. Qee cov polymers muaj branched chains, hu ua branched polymers, thiab muaj ib tug linear qauv. Txawm hais tias qee cov polymers muaj kev sib txuas ntawm cov molecules, muaj ob peb qhov sib txuas, uas yog hu ua lub network qauv thiab yog lub cev qauv.
Lub thawv ntim yas tuaj yeem muab faib ua ob pawg: thermoset thiab thermoplastic. Cov qub tsis tuaj yeem hloov kho thiab siv tau, thaum lub sijhawm tom kawg tuaj yeem tsim dua. Lub thawv ntim yas yog lub npe hu ua cov khoom siv hluavtaws. Nws cov duab zoo ib yam li ntoo thuv resin nyob rau hauv ntuj cob. Txawm li cas los xij, nws yog hu ua lub thawv ntim yas vim tias nws yog cov khoom siv hluavtaws los ntawm cov tshuaj siv tshuaj.