Qhov tsim nyog ntawm kev hloov kho deg ntawm fumed silica
Aug 19, 2024
Tso lus
Vim lub polysiloxy nyob rau hauv lub fumed silicon dioxide thiab active silicon hydroxyl pab pawg neeg nyob rau sab nrauv, nws yog tshwj xeeb tshaj yog adsorbed los ntawm dej, ua rau nws hydrophilic thiab nyuaj rau ntub thiab disperse nyob rau hauv lub organic theem. Tsis tas li ntawd, vim muaj cov pab pawg hydroxyl nyob rau ntawm nws qhov chaw, lub zog saum npoo yog loj dua, thiab qhov sib xyaw ua ke yuav ua rau condense, yog li daim ntawv thov kev ua haujlwm ntawm cov khoom raug cuam tshuam. Piv txwv li, nyob rau hauv cov roj hmab vulcanization system tsis tuaj yeem ua tau zoo sib xws thiab dispersed nrog polymer, nws yog ib qho yooj yim los ua condensation nag lossis daus nyob rau hauv cov khoom txheej, thiab nws yog ib qhov tsim nyog los ntxiv silane coupling agents nyob rau tib lub sij hawm thaum nws yog siv nyob rau hauv ib tug. cov log tsheb loj. Hloov kho fumed silica yog ib yam tshiab ntawm cov khoom zoo inorganic nrog cov qauv tshwj xeeb, uas muaj yuav luag tag nrho cov superior zog ntawm zoo tib yam fumed silica, thiab vim hais tias ntawm nws hydrophobicity thiab tshwj xeeb nto qauv, daim ntawv thov teb tau nthuav dav heev. Yog li ntawd, nws yog ib qho tsim nyog yuav tau hloov kho qhov chaw ntawm fumed silica los txhim kho nws cov txiaj ntsig ntawm daim ntawv thov, nce tus nqi ntxiv ntawm cov khoom thiab nthuav dav daim ntawv thov teb ntawm cov khoom.
Cias muab tso, qhov chaw ntawm unmodified fumed silica muaj ib tug loj tus naj npawb ntawm hydroxyl pawg thiab polar pawg, thiaj li hais tias cov thawj hais yog ib qho yooj yim mus sib tsoo nrog ib leeg thiab sib sau ua ke los ua ib tug thib ob aggregates, uas muaj feem xyuam rau lub uniform dispersion ntawm fumed silica nyob rau hauv cov organic. polymers, thiab tsis tuaj yeem ua tau raws li qhov tshwj xeeb xav tau ntawm qee qhov kev lag luam. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau ua raws li kev hloov kho tshuaj kho mob rau ntawm qhov chaw ntawm fumed silica, kom lub ntsej muag ntawm fumed silica hloov los ntawm hydrophilic mus rau hydrophobic, thiaj li los txhim kho cov infiltration, dispersion thiab interface bonding zog ntawm nano-fumed silica hais. thiab cov organic molecules, thiab txhim kho kev ua tau zoo ntawm cov ntaub ntawv sib xyaw.
