Polyvinylpyrrolidone

Kev npaj:

Txheej txheem 1: Kho NVP rau hauv kev daws nrog ib feem ntawm 50 feem pua, siv me me ntawm hydrogen peroxide ua catalyst, thiab pib polymerization ntawm 50 degree nyob rau hauv qhov kev txiav txim ntawm azobisisobutyronitrile, yuav luag tag nrho NVP hloov dua siab tshiab rau hauv PVP. Tom qab ntawd ntxiv cov dej ammonia rau cov polymer kom decompose cov seem azobisobutyronitrile, cov monomer polymerization hloov pauv tus nqi yog ze li ntawm 100 feem pua, thiab cov ntsiab lus khoom yog 50 feem pua.

Txheej txheem 2: Ntxiv 0.4g dispersant P (NVP-co-VAc) thiab 80g dispersing medium ethyl acetate rau hauv 250 mL plaub-caj dab. Tom qab nplawm thiab dissolving nyob rau hauv ib tug 70 degree qhov kub thiab txias da dej, ntxiv 20g monomer NVP thiab 0.15g pib AIBN, React rau 6h nyob rau hauv ib tug nitrogen cua, txias thiab lim, tso cov teeb meem insoluble nyob rau hauv lub tshuab nqus tsev kom qhuav lub thawv thiab nqus tsev vacuum rau 24 teev. tau cov hmoov dawb PVP hmoov.

Feem ntau ntawm Polyvinylpyrrolidone polymerization siv AIBN ua tus pib. Tsis muaj cov ntaub ntawv hais txog kev siv cov dej-soluble azo cov thawj coj los pib cov synthesis ntawm PVP, tab sis qee cov neeg ua qhov no. Txij li thaum ob qho tib si NVP monomer thiab PVP yog soluble hauv dej, cov dej-soluble azo pib siv tau los pib polymerization los tsim linear PVP polymers. Ntxiv mus, AIBN muaj cyano pawg uas muaj kev phom sij rau tib neeg, thaum dej-soluble azo Feem ntau ntawm cov pib tsis muaj cyano pawg, thiab PVP feem ntau yog siv rau hauv cov khoom uas muaj kev sib cuag nrog tib neeg lub cev, yog li dej-soluble azo pib. muaj qhov zoo dua li AIBN.

Cim npe nrov: polyvinylpyrrolidone, Tuam Tshoj, lwm tus neeg, manufacturers, hoobkas, lag luam wholesale, yuav, dawb qauv