Cov khoom tseem ceeb ntawm lub hnab ntim khoom noj

Synthetic resins tuaj yeem muab faib ua cov thermoplastic resins thiab cov thermosetting resins nyob ntawm cov kev hloov uas tshwm sim thaum rhuab.

Thermoplastic cob

Nws muaj cov yam ntxwv ntawm softening los ntawm tshav kub, txias thiab hardening, thiab nws tsis muaj tshuaj tiv thaiv. Qhov kev ua tau zoo no tuaj yeem tswj xyuas txawm tias muaj pes tsawg zaus cov cua sov thiab cua txias dua. Cov qauv molecular ntawm cov thermoplastic resin yog linear. Nws suav nrog tag nrho cov polymeric resin thiab ib nrab fused resin. Cov thermoplastic resin muaj xws li polyethylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, roj hmab, thiab lwm yam. Cov thermoplastic resin muaj qhov zoo ntawm kev ua haujlwm yooj yim thiab muaj zog txhua yam. Qhov tsis zoo yog qhov tsis zoo thaum tshav kub kub thiab rigidity.

Thermosetting cob

Tom qab cov resin yog rhuab, nws dhau los ntawm kev hloov tshuaj, maj mam hardened, thiab tsis softened los ntawm tshav kub, thiab tsis tuaj yeem yaj. Lub thermosetting resin muaj cov qauv molecular uas yog ib hom ntau, thiab suav nrog feem ntau ntawm cov khoom siv condensation. Lub thermosetting resin muaj qhov zoo ntawm kev kub siab ua haujlwm thiab deformation nyob rau hauv siab. Qhov tsis zoo yog tias cov khoom siv kho tshuab tsis zoo. Thermosetting resins muaj xws li phenolic, epoxy, amino, unsaturated polyester, thiab silicone ether resins.