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Xue H.,Nankai University | Fan Y.,Nankai University | Wang C.,Nankai University | Jin X.,Tianjin Nankai Hecheng Science and Technology Co.
Lizi Jiaohuan Yu Xifu/Ion Exchange and Adsorption | Year: 2014

The methylisocyanate polystyrene resins (PS-NCO) were synthesized with aminomethyl polystyrene resins in the presence of triphosgene. The content of functional group in the PS-NCO resins was verified by reaction with excess dibutylamine, and then determined by acid-base titration. The influence of air moisture on content of isocyanato group was also focused on. The results showed that the functional group transformation of aminomethyl to isocyanatomethyl was a fast, simple reaction with higher conversion. The content of isocyanato group can be measured by acid-base titration after the one hour reaction of resins and dibutylamine. Under drying and sealing environment, the change of content of isocyanato group was so less to meet the requirement of storage and transportation of PS-NCO resins. Source


Chen L.,Tianjin Nankai Hecheng Science and Technology Co. | Chang R.,Tianjin Nankai Hecheng Science and Technology Co. | Li X.,Tianjin Nankai Hecheng Science and Technology Co. | Yu H.,Tianjin Nankai Hecheng Science and Technology Co. | And 4 more authors.
Lizi Jiaohuan Yu Xifu/Ion Exchange and Adsorption | Year: 2014

This paper studied the synthesis of hydrophobic polyacrylate enzyme carriers, aimed at improving its immobilization performance. The results showed that the pore structure was suitable for immobilizing penicillin acylase, D-amino acid oxidase, and DL-7-ACA acylase. And the enzyme activity of D-amino acid oxidase immobilized had a close relationship with the water content of the carriers (mainly depending on the pore structure); the major advantage of these carriers was that the immobilized efficiency was up to 50% during the enzyme immobilization. Source

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