Thermoplastic
Nws ua kom muag thiab txawm ntws thaum kub, thiab txias zuj zus. Txoj kev no yog rov qab los thiab rov tuaj yeem rov qab ua dua.
Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic, lwm cov polyolefins thiab copolymers, agglomerates, polyphenylene ethers, chlorinated polyethers, etc. Thermoplastic.
Nyob hauv lub thermoplastic, cov chains ntawm cov pob zeb diamagnines yog linear los yog branched, thiab tsis muaj cov tshuaj sib txuas ntawm cov chains ntawm molecular, uas softens tus khiav thaum rhuab. Cov txheej txheem ntawm cov cua txias yog qhov hloov ntawm lub cev.
Thermoset yas
Thaum twg thawj cua sov, cov dej ntws mus yoojyim, ua kom sov ib qho kub, thiab cov tshuaj tiv thaiv yog khov kho los ntawm kev sib tsoo thiab sib zog. Qhov kev hloov no yog irreversible, thiab tom qab ntawd, thaum rhuab dua, nws yuav tsis muag muag.
Nws yog los ntawm tus cwj pwm no hais tias txoj kev molding yog ua tiav los ntawm kev siv cov khoom pov npav rau lub sij hawm ntawm thawj cua sov, puv qhov kab noj hniav hauv siab, thiab sib koom ua khoom tsim muaj qhov pom thiab qhov loj. Cov khoom no hu ua thermoset yas.
Lub thermosetting yas cob yog linear los yog branched ua ntej kev kho, thiab cov ntaub ntawv siv cov tshuaj sib txuas ntawm cov zauv ntawm molecular tom qab solidification, uas ua ib lub qauv ntawm peb lub voj voog, uas tsis tuaj yeem tsuas yaj tau, tiam sis tseem tuaj yeem tsis muaj pov thawj hauv qhov hnyav.
Phenolic, aldehyde, melamine, epoxy, unsaturated polyester, silicone thiab lwm yam plastics yog tag nrho thermosetting plastics.
Feem ntau siv rau kev tiv thaiv thaum tshav kub kub, tiv thaiv ua haujlwm, kev tiv thaiv hluav taws xob, hluav taws xob ua haujlwm siab thiab lwm yam yas uas siv hauv cov huab cua hnyav, feem ntau yog cov thermosetting plastics. Cov khoom siv feem xyuam feem ntau yog wok pan kov thiab cov khoom siv hluav taws xob thiab khoom qis hluav taws xob tsawg.
