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对聚氨酯(PU)的表面进行除油、除污等预处理,然后表面经甲苯-2,4-二异氰酸酯(TDI)活化,在表层形成未反应的自由异氰酸酯基团(NCO)。再通过2-溴乙醇与表面自由的异氰酸酯基团反应,在表层形成溴原子端基。该原子在催化剂氯化亚铜(CuCl)和配体2,2-联二吡啶(Bpy)的存在下,将丙烯酸甲酯通过原子转移自由基聚合(ATRP)接枝到PU表面。动力学研究揭示,丙烯酸甲酯的接枝率与反应时间成线性关系:表明表面链增长反应为可控活性聚合。使用衰减全反射傅立叶红外光谱(ATR-FTIR)和X-射线光电子能谱(XPS)表征分析每一步处理后的PU膜片。
The surface of polyurethane (PU) was degreased and decontaminated. The surface was then activated by toluene-2,4-diisocyanate (TDI) to form unreacted free isocyanate group (NCO) on the surface. Then by 2-bromoethanol with the surface of the free isocyanate group reaction, the formation of bromine atoms in the surface of the terminal group. The atom grafted onto the PU surface by atom transfer radical polymerization (ATRP) in the presence of the catalyst cuprous chloride (CuCl) and the ligand 2,2-bipyridyl (Bpy). Kinetic studies revealed that the grafting rate of methyl acrylate is linear with the reaction time: it indicates that the surface chain growth reaction is a controlled living polymerization. The PU membranes after each step of treatment were characterized using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) characterization.