2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thermoset polymers tsis soften thaum rhuab vim cov molecules yog cross-linked ua ke thiab nyob twj ywm nruj. Cov tshuaj sib txuas ua ke tsim nyob rau hauv ib lub polymer, thiab cov duab ntawm cov khoom polymer, cuam tshuam rau nws cov khoom.
Vim li cas cov thermosetting yas tsis yaj thaum rhuab?
Cov yas tuaj yeem muab tso rau hauv ib qho ntawm ob pawg, nyob ntawm seb lawv teb li cas thaum cua sov. Thermosoftening plastics yaj thaum lawv rhuab. … Thermosoftening plastics tsis muaj covalent bonds ntawm cov nyob sib ze polymer molecules, yog li cov molecules yuav txav mus rau ib leeg thaum rhuab thiab cov yas yaj.
Vim li cas lub ntsuas sov tsis yaj?
Polymers nyob rau hauv cov khoom sib txuas sib txuas thaum lub sijhawm kho kom ua tau ib qho kev sib koom ua ke, irreversible bond. Qhov no txhais tau hais tias cov thermosets yuav tsis yaj txawm tias thaum raug kub heev. … Tsis tas li ntawd, qee cov ntaub ntawv xws li polyester tuaj yeem tshwm sim hauv cov thermoplastic thiab thermoset versions.
Yuav ua li cas thaum cov thermosetting yas yog cua sov?
Ib lub thermosetting resin, lossis thermosetting polymer, feem ntau yog cov khoom siv ua kua ntawm chav tsev kub uas ua rau tsis muaj zog thaum cua sov lossis tshuaj ntxiv. … Thermosets, thaum cua sov, ua teeb, tsau rau hauv ib daim ntawv tshwj xeeb. Thaum lub sij hawm overheating, cov thermosets zoo li degrade yam tsis tau nkag mus rau theem dej.
Tau qhov ntsuas kubyas tiv tshav kub?
Tag nrho tsev neeg ntawm cov khoom siv hluav taws xob tiv thaiv cua sov tuaj yeem ua haujlwm tau zoo ntawm kub tshaj 120 ° C thiab mus txog 300 ° C. Qhov kub kub no yog vim cov txheej txheem hauv uas lawv tsim.
Pom zoo:
Thaum anisole rhuab nrog nyob zoo cov khoom puas yog?
Thaum alkyl aryl ether yog rhuab nrog HI, lub halogen mus nrog alkyl pawg. Yog li ntawd, ntawm cua sov anisole (methyl phenyl ether) nrog HI, phenol thiab methyl iodidetau. Dab tsi yog cov khoom tsim thaum anisole kho nrog HI? Phenyl iodide thiab methyl iodide.
Thaum ferrous sulphate rhuab?
Ntawm cua sov, ferrous sulphate crystals poob dej thiab anhydrous ferrous sulphate (FeSO 4 ) yog tsim . Yog li lawv cov xim hloov ntawm lub teeb ntsuab mus rau dawb. Ntawm cov cua kub ntxiv, anhydrous ferrous sulphate decomposes tsim ferric oxide (Fe 2 O 3 ), sulfur dioxide (SO 2 ) thiab sulfur trioxide (SO 3).
Cov thermosetting yas puas tuaj yeem yaj tau?
Raws li cov khoom siv thermoplastics, cov thermosets (hloov hu ua thermosetting plastics lossis thermosetting polymers) yog cov ntaub ntawv uas nyob hauv lub xeev ruaj khov tom qab kho ib zaug. … Qhov no txhais tau hais tias thermosets yuav tsis yaj txawm tias thaum raug kub heev.
Yuav ua li cas thaum thermosetting polymers raug cua sov?
Cov txheej txheem sib txuas: Thaum cov thermoplastic polymers tau rhuab lawv hloov pauv. … Thermoset polymers tsis soften thaum rhuab vim hais tias cov molecules yog cross-linked ua ke thiab nyob twj ywm nruj. Cov tshuaj sib txuas ua ke tsim nyob rau hauv ib lub polymer, thiab cov duab ntawm cov khoom polymer, cuam tshuam rau nws cov khoom.
Puas cov uas tsis yog cov yaj yaj hauv qhov cub?
Quins yog qhov lom zem heev uas tuaj yeem ua ntau yam duab, qhov ntau thiab tsawg, thiab xim. Lawv kuj hu ua Sequins lossis Qab Zib Shapes thiab siv los kho cov khoom ci. Lawv tsis ua hauj lwm zoo heev rau ci nrog, raws li lawv yuav yaj thiab plam lawvcov duab lom zem.
