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

Synthesis of Polymers Bearing Functional End-Groups by RAFT Polymerization and Investigation of Their Properties

Author FuJunWei
Tutor ZhuXiuLin
School Suzhou University
Course Polymer Chemistry and Physics
Keywords Dithio benzoate Trithiocarbonate Fluorescence Styrene Reversible addition - fragmentation chain transfer polymerization
CLC O631.3
Type Master's thesis
Year 2008
Downloads 155
Quotes 0
Download Dissertation

This synthesis of 4-N, N-diphenyl amino - dithio benzoate (4-diphenylamino-dithiobenzoic acid benzyl ester, DDABE), S, S'-bis (1 - naphthylmethyl) - trithiocarbonate carbonate (S, S'-bis (1-naphthylmethyl) trithiocarbonate, BNTTC), S, S'-bis (9 - anthracenylmethyl) - trithiocarbonate (S, S'-bis (9-anthrylmethyl) trithiocarbonate, BATTC), and their success for ethylene monomer addition - fragmentation chain transfer polymerization, and then study the properties of the resulting polymer. The main content and the results are as follows: (1) System 1: Synthesis of a novel triphenyl amine RAFT agent :4-N, N-diphenyl amino - dithio benzoate (4-diphenylamino-dithiobenzoic acid benzyl ester, DDABE ). The DDABE successfully used in the polymerization of styrene and methyl acrylate. The results show that at 70 ℃ AIBN as the initiator under the conditions, DDABE the polymerization of styrene and methyl acrylate showed better control and display of the \With the conversion of the polymer molecular weight increases linearly, and the theoretical molecular weight in good agreement with the actual molecular weight, molecular weight distribution of the polymer obtained index is small (PDI lt; 1.5). St investigated at 70 ℃ the polymerization initiator AIBN St / DDABE / AIBN ratio of the polymerization control, the results shows that with increasing concentration of the monomer polymerization rate decreased, but no significant change in PDI. In addition, the polymer chain extension reaction and analysis of the 1H NMR spectrum confirmed that about 80% can be end groups of the polymer chain containing triphenyl amine group. Finally, it examines the resulting end of three functional groups of the polymer aniline UV absorption and fluorescence spectroscopy, optical performance. (2) System 2: synthesis of a new group-containing naphthalene RAFT agent: S, S'-bis (1 - naphthylmethyl) - trithiocarbonate (S, S'-bis (1-naphthylmethyl) trithiocarbonate, BNTTC). The BNTTC successfully used RAFT polymerization of styrene. The results show that the initiator and a thermal initiator initiation conditions, BNTTC polymerization of styrene showed better control. St investigated at 110 ℃ thermal induced polymerization of monomer / BNTTC control the ratio of the polymerization, the results show an increase in concentration of the reagent with RAFT polymerization rate decreased, but no significant change in PDI. And polymer chain extension reaction by 1H NMR spectra analysis confirmed that most of the end groups of the polymer contain naphthyl groups. The effects of the resulting terminal functional groups of the polymer is a naphthalene UV absorption and fluorescence spectroscopy, optical performance. Further, the resulting PS-step synthesis as RAFT agent molecules of fluorescent amphiphilic ABA type triblock copolymer PS-b-PNIPAM-b-PS, from the GPC, NMR and IR spectra prove PS -b-PNIPAM-b-PS has been successfully synthesized. Fluorescence test instructions copolymer PS-b-PNIPAM-b-PS PS greater than the corresponding fluorescence emission. Finally, the study of PS-b-PNIPAM-b-PS in DMF / water mixed solvent and the concentration of the copolymer to form micelles, the copolymer chain segments and UV radiation and other factors on the size and shape of micelles of . (3) System 3: Synthesis of a novel anthracycline-containing RAFT agent groups: S, S'-bis (9 - anthracenylmethyl) - trithiocarbonate (S, S'-bis (9-anthrylmethyl) trithiocarbonate, BATTC). The BATTC styrene and methyl methacrylate used in the polymerization. The results show that the initiator and a thermal initiator initiation conditions, BATTC polymerization of styrene showed better control and display of the \Of methyl methacrylate and BATTC no effect on the controllability of the polymerization of styrene good controllability, the resulting poly (methyl methacrylate) and the actual molecular weights are theoretical molecular weight difference between the larger, but the molecular weight distribution is narrow ( PDI lt; 1.5). Further, the obtained polystyrene chain extension reaction and analysis of the 1H NMR spectrum confirmed that the polymer end groups can contain naphthyl groups. Finally, also examines the resulting functional group-terminated polystyrene anthracene UV absorption and fluorescence properties of the UV excitation conditions reversible photochemical reaction.

Related Dissertations
More Dissertations