Titanate coupling cov neeg ua haujlwm tsim kev sib txuas lus zoo ntawm cov khoom siv hauv cov khoom siv thiab cov organic matrices. Lawv txoj kev siv ncaj qha txiav txim siab cov khoom siv kho tshuab, kev ua haujlwm ruaj khov, thiab ua haujlwm ntev ntawm cov khoom sib xyaw. Mastering scientific daim ntawv thov cov txheej txheem tuaj yeem ua kom muaj txiaj ntsig zoo ntawm cov khoom ntxiv thaum txo cov nqi.
Thawj qhov tseem ceeb yog qhov kev xaiv meej ntawm cov txheej txheem tsim nyog. Titanate esters muaj ntau haiv neeg, cais los ntawm cov pab pawg ua haujlwm rau hauv monoalkoxy, chelate, thiab kev sib koom ua ke, txhua tus muaj cov txheej txheem sib txawv thiab cov xwm txheej siv tau. Piv txwv li, hom monoalkoxy yog qhov tsim nyog rau qis -polarity polymer systems, thaum hom chelate, vim lawv cov dej tsis zoo, yog qhov tsim nyog rau qhov chaw ntub dej lossis dej -raws li kev ua haujlwm. Kev xaiv cov txheej txheem yuav tsum xav txog qhov polarity ntawm matrix resin, cov yam ntxwv ntawm qhov chaw muab tub lim (xws li cov ntsiab lus hydroxyl), thiab cov txheej txheem ua haujlwm (kub, av noo) kom tsis txhob muaj "ib-loj- haum-tag nrho" txoj hauv kev uas tuaj yeem ua rau kev sib koom ua ke tsis ua haujlwm.
Kev tswj kev noj tshuaj yog qhov tseem ceeb rau kev ntsuas kev ua tau zoo thiab kev lag luam. Kev sib ntxiv ntau dhau tuaj yeem ua rau "dhau-coupling," ua rau nws tus kheej-polymerization ntawm cov additive los yog cuam tshuam cov muab tub lim dispersion; Tsis txaus ntxiv ua rau tsis tiav kev hloov kho interface, ua rau nws nyuaj rau tsim cov txheej txheem ruaj khov. Qhov feem ntau pom zoo ntxiv tus nqi yog 0.5%-3% ntawm qhov muab tub lim, tab sis qhov kev txheeb xyuas tshwj xeeb yuav tsum muaj kev sim me me: cov qauv ntawm cov gradient tuaj yeem npaj los kuaj lub zog tensile, cuam tshuam qhov hnyav, thiab lwm yam ntsuas, nrog rau qhov qis tshaj qhov sib npaug ntawm qhov ua tau zoo inflection point yog qhov kev daws teeb meem zoo tshaj.
Cov txheej txheem Pretreatment cuam tshuam rau kev ua tau zoo. Rau kev kho kom qhuav, nws raug nquahu kom dilute tus neeg sawv cev sib txuas hauv cov kuab tshuaj uas tsis muaj dej (xws li ethanol lossis toluene) thiab tshuaj tsuag rau ntawm qhov chaw muab tub lim, ua kom cov txheej txheej zoo sib xws los ntawm kev sib xyaw ua ke los ntawm siab -kev sib xyaw ceev (ceev ntau dua lossis sib npaug li 1000 r / min), tom qab ziab kom tshem tawm cov kuab tshuaj. Rau kev kho ntub dej, tus neeg sawv cev sib txuas yuav tsum tau muab ntxiv rau hauv cov khoom siv slurry, tswj cov pH tus nqi thiab nplawm tus nqi kom tsis txhob muaj cov dej hauv zos ntau heev uas tuaj yeem ua rau hydrolysis. Kev saib xyuas tshwj xeeb yuav tsum tau them rau qhov tseeb tias titanate esters rhiab heev rau ya raws; ib puag ncig qis - av noo (qhov txheeb ze av noo tsawg dua lossis sib npaug li 40%) yuav tsum tau khaws cia thoob plaws hauv cov txheej txheem pretreatment los tiv thaiv ester pawg hydrolysis thiab deactivation.
Cov txheej txheem ua tiav kuj yuav tsum muaj kev tswj hwm nruj. Rau cov txheej txheem melting, cov neeg ua haujlwm sib txuas yuav tsum tau muab ntxiv thaum lub sij hawm pib sib xyaw ntawm cov muab tub lim thiab cob, siv lub zog shear los txhawb lawv cov kev taw qhia kev sib raug zoo ntawm lub interface. Yog tias siv cov tshuaj sib tov, tus neeg sawv cev sib txuas yuav tsum tau muab tso rau hauv cov resin ua ntej, tom qab ntawd ntxiv cov muab tub lim, kom tsis txhob pov tseg vim yog muab tub lim adsorption ntawm undispersed additives. Tsis tas li ntawd, qhov kev ua haujlwm kub yuav tsum siab tshaj qhov sib txuas ntawm tus neeg sawv cev qhov kub thiab txias (feem ntau yog 80-}150 degree), tab sis qis dua nws qhov kub decomposition (uas tuaj yeem txiav txim siab ua ntej los ntawm kev ntsuas thermal) kom ntseeg tau tias muaj cov tshuaj tiv thaiv tag nrho thiab tiv thaiv kev degradation.
Hauv cov ntsiab lus, kev siv tau zoo ntawm titanate coupling cov neeg ua haujlwm yuav tsum tau ua tib zoo xav txog "kev xaiv, ntau npaum li cas, pretreatment, thiab sijhawm," ua kom lawv cov kev cai sib cuam tshuam los ntawm kev ua haujlwm zoo los muab kev txhawb nqa txhim khu kev qha rau kev txhim kho cov khoom sib xyaw ua haujlwm.
