%0 Journal Article
%T Synthesis of Polyethers Containing Triazole Units in the Backbone by Click Chemistry in a Tricomponent Reaction
%A Moslem Mansour Lakouraj
%A Vahid Hasantabar
%A Nazanin Bagheri
%J Journal of Polymers
%D 2013
%R 10.1155/2013/167106
%X A series of linear aromatic polyethers containing triazole units were synthesized via the direct click reaction of dibromide and bisethynyl compounds in the presence of sodium azide as one pot reaction. The structures of polymers were approved by using IR and 1H NMR techniques. The solubility experiments showed that polymers have good solubility in polar aprotic solvents such as DMSO, DMF, and NMP at higher temperatures. Thermal stability of the polymers was measured using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) which indicated that they possessed good thermal stability ( up to 558¡ãC) and high (191.7¨C260¡ãC) under N2 atmosphere. All the polymers were amorphous according to the DSC and X-ray diffraction. These polymers exhibited strong UV-vis absorption maxima near to 400£¿nm and up to 500£¿nm in DMSO solution. 1. Introduction Poly(arylene ether)s (PAEs) are known as an important class of the high-performance polymeric materials which consist of aromatic rings and ether linkages [1]. So far, one of the most common and effective methods for the formation of aromatic ether linkages in polyether synthesis was nucleophilic aromatic substitution (SNAr) reaction. Different poly(aryl ether)s including poly(ether sulfone)s, poly(ether ketone)s, and poly(ether imide)s have been prepared using the SNAr reaction and commercialized [2]. However, this method suffers from some serious limitations such as high temperature and harsh conditions. In addition, only appropriate monomers having electron-withdrawing groups at the ortho position to the leaving group could be polymerized. Recent innovations in synthetic methodology have improved polymer synthesis, enabling the custom design of a large variety of macromolecular architectures under incorporation of desired functional units [3, 4]. To find an outstanding polymerization reaction, polymer chemists and biotechnologists have increasingly turned towards advanced synthetic organic concepts. In this respect, the most interesting one is click chemistry well documented in the past decade. The applications of click reactions are wide in scope. The click reactions give excellent yields and generate inoffensive by-products that can be removed by convenient methods. The required process characteristics include simple reaction conditions, readily available reactants, solvent free reactions or using a solvent that is benign or easily removed, and simple product isolation [5]. To date, the most popular reaction that satisfied these features is the 1,3-dipolar cycloaddition, also known as Huisgen
%U http://www.hindawi.com/journals/jpol/2013/167106/