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研究了对于羟丙基纤维素 (HPC)基板进行表面修饰时 ,基板表面状态的调控对基板表面化学接枝的影响 .用双官能团化合物 2 ,4 甲苯二异氰酸酯 (TDI)作为接枝桥梁 ,其对位的异氰酸酯基先和基板上的羟基反应 ,保留的邻位异氰酸酯基进一步再与丙烯酸的羧基反应 ,让接枝在基板上的活性丙烯酸分子继续和丙烯酸溶液聚合 ,通过这种途径在基板表面修饰聚丙烯酸 .基板制备时 ,由于不同介质对HPC基板表面的不同诱导作用 ,导致表面组成各异 ,大大影响了接枝反应的效果 .红外光谱和二次离子飞行时间质谱均证明了可以用 2 ,4 甲苯 -二异氰酸酯 (TDI)分子做接枝桥梁在基板表面异相接枝上羧基并进一步接枝聚丙烯酸 ,从而达到修饰基板的目的 .
The effect of the substrate surface condition on the chemical grafting on the surface of HPC substrate was studied.The surface tension of the surface of the HPC substrate was investigated by using bifunctional compound 2 and toluene diisocyanate (TDI) The isophoric isocyanate group first reacts with the hydroxyl groups on the substrate, the remaining ortho-isocyanate group further reacts with the carboxyl groups of the acrylic acid to allow the reactive acrylic acid molecules grafted onto the substrate to continue to polymerize with the acrylic acid solution. In this way, Modified polyacrylic acid substrate preparation, due to different media on the HPC substrate surface induced by different, resulting in different surface composition, which greatly affected the grafting reaction results. Infrared spectroscopy and secondary ion flight time-of-flight mass spectrometry proved that you can use 2 , 4 toluene - diisocyanate (TDI) molecules do grafting bridge on the substrate surface heterogeneous grafted carboxyl and further grafted polyacrylic acid, so as to achieve the purpose of modifying the substrate.