分批投料对甲基丙烯酸丁酯/丙烯酰胺共聚物结构和性能的影响

Effects of Batch Feeding on Structure and Properties of Butyl Methacrylate/Acrylamide Copolymers

采用两步投料法,通过过氧化苯甲酰引发自由基本体聚合反应合成甲基丙烯酸丁酯(BMA)/丙烯酰胺(AM)共聚物,有效消除一步投料时AM单体的析出现象。采用红外光谱分析(FTIR)、差示扫描量热法(DSC)、热重分析法(TGA)、特性黏度和压缩性能测试等手段研究BMA分批投料对BMA/AM共聚物结构和性能的影响。结果表明:随着BMA分批投料比的增大,AM单体的转化率提高,BMA/AM共聚物的特性黏度逐渐增大;当BMA分批投料比为50/50时,合成的BMA/AM共聚物中AM链节量最多,BMA/AM共聚物的热稳定性能和压缩强度得到明显提高。

Butyl methacrylate(BMA)/acrylamide(AM)copolymers were synthesized via free radical bulk polymerization by using benzoyl peroxide as the initiator and two-step feeding,which could effectively eliminate separation of AM monomer appearing in one-step feeding.Effects of batch feeding on the structure and properties of BMA/AM copolymers were investigated by infrared adsorption spectrum(FTIR),differential scanning calorimetry(DSC),thermogravimeter analysis(TGA),characteristic viscosity analysis and compression performance test.Results indicate that the conversion rate of AM monomer improves and intrinsic viscosity of BMA/AM copolymers increases as batch feeding ratio increases.When the batch feeding ratio is 50/50,the quantity of AM chain links is the most in BMA/AM copolymers;thermal stability and compression strength of BMA/AM copolymers improve significantly.