PvP yog lub tshuab monomer Pyrrolidone (NVP) ua raw khoom, los ntawm ntau cov polymerization, kua polymerization thiab lwm yam. Nyob rau hauv cov txheej txheem ntawm ib co polymerization, vim cov loj viscosity ntawm cov tshuaj tiv thaiv lawv, polymer tsis yooj yim rau diffuse, polymerization Event tshav kub tsis yooj yim tshem lub zos overheating thiab lwm yam teeb meem, ces cov khoom muaj tsawg molecular phaus, residual monomer ntsiab lus yog siab, thiab ntau daj, tsis ntau npaum li qhov muaj nqis. PvP feem ntau yog tsim los ntawm cov tshuaj polymerization hauv kev lag luam.
PvP ntau lawm polymerization muaj ob txoj kev tseem ceeb, thawj ua cov Cyanoethyl pyrrolidone (NVP) nyob rau hauv cov organic solvents rau cov tshuaj polymerization, thiab tom qab lub zog stripping. Qhov thib ob txoj kev yog cov kua polymerization ntawm nvp monomer thiab dej-soluble cation, anion lossis nonionic monomer.
Lub NVP monomer yog rhaub ncaj nraim rau ntau tshaj 140 Shan, los yog cov lag luam yog cua sov hauv NVP, los yog hauv cov kua NVP (qhov hnyav tau dej, ethanol, benzene, thiab lwm yam) ntxiv rau cov lag luam los ntawm cov dawb radical daws polymerization, los yog cov ncaj lub teeb meem irradiation NVP monomer los yog nws cov tshuaj yuav muab tau cov PVP aggregates, polymerization txoj kev sib txawv, qauv polymer thiab cov kev ua tau zoo sib xws, uas cov dawb radical daws polymerization tau txais polymer muaj pes tsawg leeg, tus qauv yog homogeneous. Kev ua haujlwm kuj yog qhov ruaj khov, qhov feem ntau yog siv hom ntawm NVP polymerization, kho qhov monomer concentration, aggregation temperature, initiator dosage thiab lwm yam kev mob tshwm sim uas muaj peev xwm txawv molecular phaus thiab txawv dej-soluble pvp aggregates.
Cov txheej txheem ib qho: Tus NVP yog kho kom haum nrog ib pawg feem ntawm 50%, nrog rau ib qho me me ntawm hydrogen peroxide raws li ib tug catalyst, nyob rau hauv qhov kev txiav txim ntawm Azo-Butadiene nitrile, nyob rau hauv 50 Shan polymerization, li ntawd nvp yuav luag tag nrho rau hauv PvP . Ntxiv ammonia rau lub polymer kom decompose cov residual azo-butadiene nitrile, tus nqi ntawm monomer polymerization conversion tau ze li ntawm 100% thiab cov khoom tau yog 50%.
Ntev Ob: Ntxiv 0.4 G dispersant P (NVP-Co-vac) thiab $ naj npawb nruab nrab acetic ester $ nos ml $ 4 ml, 70 Shan qhov dej kub tom qab sib tov, ntxiv nvp thiab 0. G Initiator aibn , nitrogen huab cua tshwm sim 6 h, txias thiab pom, tsis tsim nyob rau hauv lub tshuab nqus tsev qhuav hauv lub tshuab nqus cua 24h, dawb pvp khoom hmoov.
Feem coob ntawm PvP polymers siv aibn li cov thawj kauj ruam, thiab tsis muaj ntaub ntawv ntawm qhov pib ntawm hluavtaws PvP los ntawm dej-soluble azo-like initiator, tab sis ib tug neeg ua haujlwm no. Vim tias NVP monomer thiab PvP cov dej nyob hauv dej, nws tau siv dej-soluble azo initiator kom induce polymerization los tsim cov kabmob PVP polymers, dhau mus, AIBN muaj ib pab pawg ntawm teeb meem pawg cyanide, thiab dej-soluble azo-like initiators feem ntau tsis muaj cyanide, PvP feem ntau siv ncaj qha kev sib cuag nrog tib neeg cov khoom, yog li dej-soluble azo initiator dua aibn ntau zoo.