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Surface Initiated Reverse ATRP to Prepare Organic/Inorganic Hybrid Composite Catalyzed by NiCl2/PPh3 System(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2007年01期
Page:
46-50
Research Field:
Publishing date:

Info

Title:
Surface Initiated Reverse ATRP to Prepare Organic/Inorganic Hybrid Composite Catalyzed by NiCl2/PPh3 System
Author(s):
Yu Mei1; Yu E2
1.Specialized Middle School Department,Lanzhou City College,Lanzhou 730070,China;2.School of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China
Keywords:
nano-s ilica;  n icke l based cata lyst ( N iC l2 /PPh3 );  reverseATRP;  o rganic / inorgan ic hybrid com po site
PACS:
TQ316.322
DOI:
-
Abstract:
In th is w ork, reve rse a tom transfe r radical po lym eriza tion o fm ethy lm e thacry late w as investiga ted by using the perox ide g roups treated nano-silica as the in itiato r and N iC l2 /PPh3 as the n ickel based cata ly st. The introduction of perox ide groups on to the silica surface w as ach ieved by the reaction of hydrogen perox ide w ith chloro sily l g roups, w hich w ere introduced by the treatm ent of silica w ith th ionyl ch lo ride. The results indicate tha t through contro l the relationsh ip o f N i2+ and N i+ , the po lym er ization w as close ly controlled and partly has the cha racter istic of / liv ing0 / contro lled radica l polym er ization. H ydro lysis o f silica co res by hydro fluoric ac id treatment enabled characteriza tion o f cleaved po lym er us ing GPC. TheGPC ana lys is ind ica ted tha t theM nGPC of PMMA ( g ra fted) inc reases linea rly w ith the increase o f conversion and them o lecularw e ight d istributions are re la tive ly na rrow. The k inetics o f the po lym er ization show ed one order, suggesting that the active spec ies kept constant during the polym e rization. AFM results ind-i cate thatw e l-l de fined po lyme r cha ins w ere g rown from the nanopartic le surfaces to y ield indiv idua l partic les com posed of a s ilica core and aw e l-l de fined oute r po lym e r lay er

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Last Update: 2013-04-29