-pyrrolidone 616-45-5

Poly vinyl pyrrolidone yog tau los ntawm monomer vinyl pyrrolidone (NVP) los ntawm bulk polymerization, kua polymerization thiab lwm txoj kev. Thaum lub sij hawm npaj cov txheej txheem ntawm bulk polymerization, lub viscosity ntawm cov tshuaj tiv thaiv yog siab, lub polymer tsis yooj yim rau diffuse, thiab lub tshav kub ntawm cov tshuaj tiv thaiv polymerization tsis yooj yim tshem tawm, ua rau lub zos overheating. Yog li ntawd, cov khoom tau txais muaj qhov hnyav molecular, siab residual monomer cov ntsiab lus, thiab ntau dua Yellow, tsis muaj nqis ntau npaum li cas. Kev lag luam feem ntau siv cov tshuaj polymerization los ua ke PVP. Muaj ob txoj hauv kev rau PVP ntau lawm thiab polymerization.

Thawj yog kev daws teeb meem polymerization ntawm NVP hauv cov kuab tshuaj organic, ua raws li chav stripping. Txoj kev thib ob yog aqueous tov polymerization ntawm NVP monomer thiab dej-soluble cationic, anionic lossis nonionic monomer. Tshav kub NVP monomer ncaj qha saum 140 degree, lossis ntxiv tus thawj coj rau NVP cov tshuaj rau cua sov, lossis ntxiv ib tus neeg pib rau NVP cov tshuaj (cov kuab tshuaj tuaj yeem yog dej, ethanol, benzene, thiab lwm yam) rau polymerize los ntawm cov tshuaj dawb radical, lossis siv nws ncaj qha PVP homopolymers tuaj yeem tau txais los ntawm irradiating NVP monomers lossis lawv cov kev daws teeb meem nrog lub teeb.

Cov txheej txheem polymerization sib txawv ua rau muaj cov qauv sib txawv thiab cov khoom sib txawv. Ntawm lawv, cov polymer muaj pes tsawg leeg thiab cov qauv tau los ntawm cov dawb radical tov polymerization yog cov sib xws. Qhov kev ua tau zoo kuj tseem ruaj khov. Nws yog txoj kev siv ntau tshaj plaws rau NVP homopolymerization. Los ntawm kev kho cov tshuaj tiv thaiv xws li monomer concentration, polymerization kub, thiab pib noj ntau npaum, PVP homopolymers nrog sib txawv molecular luj thiab sib txawv dej solubility yuav tau.

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