Synthesis by ATRP of Polystyrene-b-Poly(4-vinylpyridine) and Characterization by Inverse Gas Chromatography

M. Rajab, T. Hamieh, A. Airoudj, K. Mougin, Kamal Hariri, W. Rammal, Houssein Mortada, M. Akil, A. Kassas, J. Toufaily
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引用次数: 2

Abstract

A linear diblock copolymer [Polystyrene-b-Poly(4-vinyl-pyridine)] (PS-b-P4VP) was successfully prepared through Atom Transfer Radical Polymerization (ATRP). This synthesis is performed in two successive steps: using the (1-bromoethyl) benzene as initiatorand and Hexamethyl tris [2(dimethylamino)ethyl] amine as ligands in a protic solvent. The first step of the synthesis allows the realization of block polystyrene having a terminal function; however, Bromine (Br) permits the grafting of the second successive block P4VP. RMN -1H demonstrates that the P4VP block has been grafted onto the PS block. The molecular weight of PS-b-P4VP is determined by size exclusion chromatography, and its thermal stability is examined by TGA. The surface and the thermodynamic properties of this copolymer are studied by inverse gas chromatography (IGC). The new Hamieh Model shows that the synthesized copolymer PS-P4VP has an amphoteric behavior with rather very basic character that is six times stronger than acidic character (in Lewis terms), reflected the presence of acidic and basic groups in the structure of the PS-P4VP copolymer, more particularly the presence of benzenic, methyl and vinylpyridine groups.
聚苯乙烯-b-聚(4-乙烯基吡啶)的ATRP合成及反相色谱表征
采用原子转移自由基聚合(ATRP)法制备了线性二嵌段共聚物[聚苯乙烯-b-聚(4-乙烯基-吡啶)](PS-b-P4VP)。该合成分两个连续步骤进行:在质子溶剂中以(1-溴乙基)苯为引发剂和六甲基三[2(二甲氨基)乙基]胺为配体。合成的第一步允许实现具有末端功能的嵌段聚苯乙烯;然而,溴(Br)允许接枝第二个连续的嵌段P4VP。RMN -1H表明P4VP块已接枝到PS块上。PS-b-P4VP的分子量采用粒径排除色谱法测定,热稳定性采用热重分析仪测定。用反相气相色谱法(IGC)研究了该共聚物的表面和热力学性质。新的Hamieh模型表明,合成的共聚物PS-P4VP具有相当碱性的两性行为,其碱性比酸性强6倍(Lewis terms),反映了PS-P4VP共聚物结构中酸性和碱性基团的存在,特别是苯、甲基和乙烯基吡啶的存在。
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