采用"先核后臂"法，以丙烯酰胺（AM）、丙烯酰氧乙基三甲基氯化铵（DAC）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）、正硅酸乙酯为原料，季戊四醇（PETL）为支化剂，硝酸铈铵（CAN）作引发剂，通过自由基聚合反应和原位聚合反应制备了一种超支化两性聚丙烯酰胺（PADS）。利用红外光谱、核磁共振氢谱、支化度、热重分析及扫描电镜对PADS结构进行表征，并对其反应条件进行了优化。结果显示，所用单体（AM、DAC、AMPS）占总反应体系质量的20%，引发剂占总单体质量的0.05%，正硅酸乙酯占AM质量的5%，反应温度为50℃，反应时间为3.5 h，反应体系的pH为7。

Hyperbranched amphoteric polyacrylamide (PADS) is synthesized with free radical polymerization and in-situ polymerization through core-first method using acrylamide (AM),acryloxyethyl trimethylammonium chloride (DAC),2-acrylamido-2-methylpropyl sulfonic acid (AMPS) and tetraethoxysilane (TEOS) as raw materials,pentaerythritol (PETL) as branched agent,cerium ammonium nitrate (CAN) as initiator.The chemical structure of PADS is characterized by FT-IR,¹HNMR,DB,TG and SEM.The reaction conditions are also optimized.The optimum reaction conditions obtained are as follows:the monomers (AM,DAC,AMPS) account for 20% of the total reaction system mass,the initiator dosage amounts to 0.05% of the total monomer mass,TEOS dosage amounts to 5% of AM mass,reaction temperature is 50℃,reaction time is 3.5 h,and the pH of the reaction system is 7.

郭睿(1959-),男,硕士,教授,研究方向为精细化学品,1354641359@qq.com