Synthesis and characterization of well-defined comb-like branched polymers

Abstract

Well-defined comb-like branched polymers having one branch in each repeating unit have been successfully synthesized by the coupling reaction of living polystyrene (PS) and polyisoprene (PI) anions with 1, 1-diphenylethenyl (DPE) groups along PS backbone prepared via atom transfer radical polymerization (ATRP) of 4-vinylbenzyloxy benzophenone (Sc) followed by Wittig reaction. The resulting comb-like branched polymers were characterized by IR, 1 H-NMR, gel permeation chromatography (GPC) and static light scattering (SLS) in detail. The effect of living chains and DPE group molar ratio on grafting efficiency was discussed. The results show the coupling reaction of living chains and DPE groups was highly effective, and the coupling efficiency can be controlled via the feed molar ratios of living chains and DPE groups. Moreover, the effect of molecular weights of backbone (PSe) and PSLi or PILi on grafting efficiency was also discussed. The results show that when excess living polymers were used, the almost quantitative grafting efficiency could be achieved.

Solubility of SO2, CO2in DMSO+Mn2+mixture solvents and EOS model

“…The model used in the present study is an electrolyte EOS [1][2][3][4][5][6][7] and has already been described in a previous paper [1]. Here, we describe the differences of the model employed in the present study, with respect to ref.…”

Solubility of dilute SO2in DMSO+Mn2+mixture solvents and EOS model-(II)

“…In this model the molar of Helmholtz energy is developed as the sum of four contributions, considering interaction energy between ions and solvent and between cations and anions on the basis of EOS derived by Furst et al [1][2][3][4][5][6][7] …”

“…Hua and C. Wanren where (7) k nm is the binary parameter which can be calculated from critical constants [12]. In equation (6), another term is calculated from…”