Solution behavior of 4-arm poly(tert-butyl acrylate) star polymers

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• 作者：Barbara Mendrek ; Barbara Trzebicka ; Wojciech Wał ; ach ; Andrzej Dworak
• 关键词：Star polymers ; Poly(tert-butyl acrylate) ; Intrinsic viscosity ; Branching parameters ; ρ ; Ratio
• 刊名：European Polymer Journal
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：46
• 期：12
• 页码：2341-2351
• 全文大小：623 K

文摘

This paper reports the synthesis of 4-arm poly(tert-butyl acrylate) stars of different molar masses up to 10⁶ g/mol by the “core-first” method using ATRP. All obtained stars have a monomodal and narrow molar-mass distribution (<1.2).

The dilute-solution properties of these star polymers were investigated in good solvents (tetrahydrofuran and acetone). Gel permeation chromatography and dynamic and static light scattering were used to measure the hydrodynamic properties including intrinsic viscosity [η], radius of gyration R_g, hydrodynamic radius R_h, second virial coefficient A₂ and diffusion coefficient D₀. These data were used to establish relationships between these parameters and the molar mass of 4-arm poly(tert-butyl acrylate) stars. The branching parameters g and g′ and the shape factor ρ were calculated for all obtained star polymers.