Dissertation > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers

Study of Acrylamide-Based Block Copolymers Via RAFT Polymerization

Author JiangZuoZuo
Tutor FengJie; ShenJiangNan
School Zhejiang University of Technology
Course Materials Science
Keywords Reversible addition fragmentation chain transferpolymerization polymerization.(RAFT) Fixed carrier Block copolymer separation membrane
CLC O631.3
Type Master's thesis
Year 2012
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The study on CO2separation is one of the most important subjects inrecent years, and the facilitated transport membrane with fixed carrier ismost interesting kind of separation membranes for this purpose. Recentlymuch attention has been paid to reversible addition-fragmentation chaintransfer (RAFT) mediated living free radical polymerization in polymerchemistry. Based on the RAFT polymerization methods, we synthesisedsome new kinds of membrane materials. The immobilized carrier CO2promote transfer separation membrane were prepared.S-l-Dodecyl-S′-(,′-dimethyl--acetic acid) trithiocarbonate(MTTCD), S, S′-bis (2-hydroxyethyl-2′-dimethyla crylate) trihiocarbonate(BDATC),2-cyanoprop-2-yl-dithiobenzoate (CPDB) were prepared.Macromolecules chain transfer agents (PMAM-CTA) weresynthesized through the reversible addition fragmentation chain transferpolymeri zation (RAFT) by using MTTCD and BDATC as the chaintransfer agent, methacrylamide (MAM) as the first polymerizationmonomer. The derived block copolymer (PMAM-b-PNVP) was preparedby using the above obtained polymer as macromolecular RAFT agent andNVP as second polymerization monomer. N-vinyl-γ-sodiumaminobutyrate-sodium methacrylate copolymer (VSA-MSA) containing-NH2and-COOH as the CO2facilitated carrier, a kind of new fixed carrier membrane material for CO2separation, was synthesized by hydrolysis ofthe resulted PMAM-b-PNVP.Macromolecules chain transfer agents polymethyl methacrylate(PMMA-CTA) were synthesized through the reversible additionfragmentation chain transfer (RAFT) polymerizationby using MTTCD,BDATC, CPDB as the chain transfer agents, Methyl methacrylate (MMA)as the first monomer. The derived well-controlled block copolymerPMMA-b-PDMAEMA was successfully prepared by using the aboveobtained polymer as macromolecular RAFT agent and N,N-dimethylaminoethy methacrylate (DMAEMA) as second monomer.The chemical composition and structure of PMAM-CTA,PMAM-b-PNVP, VSA-MSA, PMMA-CTA and PMMA-b-PDMAEMAwere analyzed by FTIR,1HNMR, XRD and DSC, the molecular weight andpolydispersity index was analyzed by GPC.The VSA-MSA/PSF composite membranes were prepared and theirmicrostructures were analyzed by SEM. The CO2and N2permeationperformance were tested at different pressure. The results showed that theresulted composited membrane had a CO2permeation rate of1.2×10-4cm3(STP) cm-2s-1cmHg-1and a N32permeation rate of4.06×10-5cmSTPcm-2s-1cmHg-1permeation rate of and an ideal CO2/N2selectivity of40at afeed gas pressure of7.6cmHg and30℃.The PMMA-b-PDMAEMA/PSF composite membranes were preparedand their microstructures were analyzed by SEM. The CO2and N2permeation performance were tested at different pressure. The resultsshowed that the resulted composited membrane had a CO2permeation rateof3.68×10-5cm3(STP) cm-2s-1cmHg-1and a N2permeation rate of1.78×10-7cm3(STP) cm-2s-1cmHg-1permeation rate of and an ideal CO2/N2selectivity of200at a feed gas pressure of7.6cmHg and30℃.

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