Radiation cross-linking yog ib qho ntawm cov txheej txheem kev sib txuas ntawm PVC thaum ntxov, thiab nws kuj yog txoj kev sib txuas uas siv dav tshaj plaws. Tebchaws Asmeskas, Nyiv thiab lwm lub tebchaws tau siv txoj hauv kev no los tsim hluav taws xob sib txuas PVC insulated xov hlau. Ordinary PVC cov ntaub ntawv tsis yog hla-txuas raws li qhov kev txiav txim ntawm hluav taws xob, thiab feem ntau dhau los ntawm dehydrochlorination thiab degradation cov tshuaj tiv thaiv, ua rau cov khoom sib txuas ua ke uas ua rau cov khoom tsis muaj xim. Xyoo 1959, Pinner thiab Miller thawj zaug pom tias cov monomers tsis muaj peev xwm ua kom muaj zog tuaj yeem ntxiv dag zog rau kev sib txuas ntawm cov tshuaj tiv thaiv PVC hauv hluav taws xob, yog li ua rau nws muaj peev xwm crosslink PVC hluav taws xob. Multifunctional unsaturated monomers ntxiv yog tsuas yog trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), triallyl isocyanurate (TAIC), triene Propyl cyanurate (TAC), Tetraethylene glycol Trimethacrylate (TEGDM), Tetraethylene glycemic acid (TEGDM), Tetraethylene glycemic acid. diacrylate (TPGDA), Dipropylene glycol diacrylate (DPGDA) thiab lwm yam.
Tau ntau xyoo, ntau cov kev tshawb fawb tau maj mam nthuav tawm cov ntsiab lus ntawm cov tshuaj tiv thaiv thiab cov qauv kev hloov pauv hauv cov hluav taws xob sib txuas ntawm PVC, thiab muaj peev xwm tswj tau cov qauv thiab kev ua tau zoo ntawm cov khoom siv hluav taws xob sib txuas ntawm PVC, ua rau hluav taws xob crosslinking tshuab ntawm PVC nce mature. .
PVC hluav taws xob crosslinking feem ntau siv 60Co-ray los yog high-zog electron (EB) rays raws li qhov chaw hluav taws xob, multifunctional unsaturated monomer ua tus neeg sawv cev crosslinking, cov tshuaj tiv thaiv crosslinking yog cov tshuaj tiv thaiv dawb radical, thiab C-Cl daim ntawv cog lus ntawm PVC nyob rau hauv qhov kev txiav txim. ntawm hluav taws xob Cleavage los tsim cov dawb radical active chaw, multifunctional unsaturated monomers nyiam tsim dawb radicals thiab nws tus kheej-polymerize nyob rau hauv hluav taws xob pib, thiab graft rau PVC ntev-chain dawb radicals nyob rau tib lub sij hawm, lub hauv paus cross-linking qauv yog PVC- (cross. -linking agent) -PVC.
VK SHARMA et al. siv hluav taws xob hluav taws xob (EB) hluav taws xob rau crosslink mos PVC, thiab kawm txog qhov cuam tshuam ntawm peb tus neeg sawv cev crosslinking-TMPTA, TEGDM thiab TEGDA ntawm tus nqi sib txuas thiab thermal stability ntawm mos PVC. TBLS) ua tus stabilizer ntawm qhov system. Cov txiaj ntsig tau pom tias 5 feem pua TMPTA muaj qhov cuam tshuam zoo tshaj plaws. Thaum cov gel pawg feem ntau yog 60 feem pua, nws lub zog tensile ncav cuag 23.5 MPa, uas yog hais txog 7 feem pua siab dua qhov uas tsis muaj kev sib txuas. Nyob rau tib lub sijhawm, qhov ntim ntawm qhov sib txuas ntawm cov mos mos PVC yog qhov tiv taus thiab decomposition kub kuj tuaj yeem txhim kho tau zoo.
Ratnam et al. tau txais tib txoj kev sib txuas hluav taws xob sib txuas, siv TMPTA los hla-txuas nyuaj PVC, thiab Si TBLS ua tus stabilizer ntawm lub kaw lus, thiab kawm txog kev sib raug zoo ntawm cov ntsiab lus gel thiab lub zog tensile thiab hardness ntawm tawv PVC thaum cov tshuaj tawg. 20-200 kGy. Nyob rau tib lub sijhawm, Tg ntawm cov tshuaj tiv thaiv hluav taws xob ntawm 100kGy tau ntsuas, thiab FTIR tsom xam tau lees paub tias cov txheej txheem ntawm cov kab hluav taws xob hluav taws xob tuaj yeem zam qhov tshwm sim ntawm cov tshuaj tiv thaiv degradation. Txoj kev tshawb nrhiav pom tias thaum cov tshuaj tiv thaiv hluav taws xob yog 100kGy, cov gel feem ntau tau mus txog 85 feem pua , thiab Tg ntawm cov ntoo khaub lig-txuas rigid PVC tau nce los ntawm 2.5 degree piv nrog cov qauv tsis sib txuas. Nyob rau tib lub sijhawm, kev tshawb fawb txog cov khoom ntawm hluav taws xob sib txuas nyuaj PVC qhia tau hais tias lub zog tensile thiab hardness ntawm nyuaj PVC qauv cross-linked nrog ib tug tsim nyog tus nqi ntawm cross-linking tus neeg saib xyuas (4 feem pua) yog ho txhim kho. Thaum cov gel loj feem mus txog 80 feem pua, lub zog tensile ncav cuag tus nqi siab tshaj plaws ntawm 55MPa, uas yog 30 feem pua siab dua qhov uas tsis muaj crosslinking. Lub sijhawm no, qhov nyuaj ntawm PVC tawv kuj tau nce li ntawm 13 feem pua , thiab pom tias muaj kev nce ntxiv nrog qhov nce ntawm cov gel loj feem.
Radiation crosslinking ntawm PVC yog cov tshuaj tiv thaiv nyuaj heev, feem ntau suav nrog PVC crosslinking, degradation, thiab HCl tshem tawm. Kev cuam tshuam ntawm ntau yam ntawm cov hluav taws xob crosslinking ntawm PVC yog ua tiav los ntawm kev cuam tshuam kev sib tw ntawm peb. Cov txheej txheem PVC hluav taws xob crosslinking cov tshuaj tiv thaiv yog cuam tshuam los ntawm ntau yam: cov tshuaj tiv thaiv hluav taws xob, hluav taws xob kub, qhov chaw ua haujlwm, tus neeg sawv cev crosslinking, plasticizer, muab tub lim thiab kev pabcuam. Piv nrog rau kev sib txuas ntawm tshuaj lom neeg, hluav taws xob sib txuas txoj kev muaj ntau yam zoo thiab yog siv dav hauv kev lag luam hlau thiab cable.
Radiation cross-linked PVC cov khoom muaj kev ua tau zoo, kev ua haujlwm siab, txuag hluav taws xob thiab tsis muaj kuab paug ib puag ncig. Nrog tib neeg kev mloog rau ib puag ncig teeb meem thiab kev nce qib ntawm hluav taws xob thev naus laus zis, PVC hluav taws xob hla kev sib txuas thev naus laus zis tau ua tiav kom nyiam ntau thiab ntau dua.