Qhov sib txawv tseem ceeb ntawm cov dawb radical thiab ionic polymerization yog tias dawb radical polymerization tshwm sim los ntawm cov radicals uas muaj cov hluav taws xob tsis sib xws thaum ionic polymerization tshwm sim ntawm hom ionic uas tsis muaj hluav taws xob tsis sib xws.
Polymerization yog cov txheej txheem tshuaj ntawm kev tsim cov ntaub ntawv polymer. Ib qho polymer yog tsim los ntawm kev sib xyaw ua ke ntawm ntau cov monomer units los ntawm cov khoom siv tshuaj. Muaj peb yam tseem ceeb ntawm polymerization ntxiv, condensation, thiab radical polymerization.
Dab tsi yog Dawb Radical Polymerization?
Dawb radical polymerization yog txheej txheem ntawm kev tsim cov khoom siv polymer los ntawm kev sib ntxiv ntawm cov dawb radicals. Dawb radicals tuaj yeem tsim tau ntau txoj hauv kev. Feem ntau txoj kev feem ntau muaj xws li ib qho pib molecule ua ib qho radical. Ib txoj saw hlau polymer tsim los ntawm kev sib ntxiv ntawm cov radical uas tsim nrog cov non-radical monomers.
Daim duab 01: Tsim cov PVC polymer los ntawm Dawb Radical Polymerization
Muaj peb kauj ruam tseem ceeb koom nrog hauv cov txheej txheem radical polymerization:
- Kev pib
- Kev nthuav qhia
- Kev txiav txim
Cov kauj ruam pib tsim qhov taw tes rov ua haujlwm. Nws yog qhov chaw uas cov saw hlau polymer tsim. Cov kauj ruam thib ob yog cov kauj ruam nthuav tawm uas cov polymer siv nws lub sijhawm los loj hlob cov saw hlau polymer. Nyob rau hauv cov kauj ruam txiav, kev loj hlob ntawm cov saw hlau polymer nres. Qhov ntawd tuaj yeem tshwm sim ntau txoj hauv kev:
- Kev sib xyaw ntawm qhov kawg ntawm ob txoj hlua polymer loj hlob
- Kev sib xyaw ntawm qhov kawg ntawm cov saw hlau polymer nrog tus pib
- Radical disproportionation (tshem tawm ntawm hydrogen atom, tsim ib pab pawg tsis txaus ntseeg)
Ionic Polymerization yog dab tsi?
Ionic polymerization yog txheej txheem ntawm kev tsim cov khoom siv polymer siv hom tshuaj ionic raws li thawj zaug reactants. Qhov no yog subtype ntawm saw-loj hlob polymerization; muaj ob hom saw-loj hlob polymerization li ionic thiab radical polymerization. Ntxiv mus, ionic polymerization tuaj yeem muab faib ua ob pawg ua cationic thiab anionic polymerization.
Daim duab 02: Cov txheej txheem dav dav ntawm Ionic Polymerization
Anionic polymerization pib nrog anion. Ntau hom kev pib tuaj yeem siv rau hauv hom txheej txheem polymerization. Muaj peb yam tseem ceeb uas tshwm sim thaum lub sij hawm anionic polymerization txheej txheem: pib, propagation thiab txiav. Cov txheej txheem yog pib los ntawm nucleophilic ntxiv ntawm anion rau ob daim ntawv cog lus hauv monomer.
Cationic polymerization pib nrog cation. Lub cation hloov nws cov nqi hluav taws xob mus rau lub monomer kom qhib lub monomer rau polymerization. Cov reactive monomer ces dhau los ua ib qho cation, thiab tib kauj ruam yog rov ua dua kom txog thaum qhov kev txiav tawm, tsim cov khoom siv polymer.
Qhov txawv ntawm Dawb Radical thiab Ionic Polymerization yog dab tsi?
Dawb radical thiab ionic polymerization yog ob txoj kev sib txawv ntawm kev tsim cov khoom siv polymer. Ob qho no yog cov subtypes ntawm chain-growth polymerization. Qhov sib txawv tseem ceeb ntawm cov dawb radical thiab ionic polymerization yog tias dawb radical polymerization tshwm sim los ntawm cov radicals uas muaj cov hluav taws xob tsis sib xws thaum ionic polymerization tshwm sim ntawm hom ionic uas tsis muaj hluav taws xob tsis sib xws.
Ntxiv mus, nyob rau hauv dawb radical polymerization, lub radical ua rau lub monomer reactive radical thaum nyob rau hauv ionic polymerization, lub anion los yog cation khi nrog lub monomer, ua ib tug reactive them hom.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm cov dawb radical thiab ionic polymerization hauv daim ntawv tabular.
Summary – Free Radical vs Ionic Polymerization
Dawb radical thiab ionic polymerization yog ob txoj kev sib txawv ntawm kev tsim cov khoom siv polymer. Ob qho no yog cov subtypes ntawm chain-growth polymerization. Qhov sib txawv tseem ceeb ntawm cov dawb radical thiab ionic polymerization yog tias dawb radical polymerization tshwm sim los ntawm cov radicals uas muaj cov hluav taws xob tsis sib xws thaum ionic polymerization tshwm sim ntawm hom ionic uas tsis muaj hluav taws xob tsis sib xws.
