摘要
本文研究了含吗啉基的丙烯酸酯类,甲基丙烯酸-2-吗啉基乙酯(MPEMA)和甲基丙烯酸-2-N-吗啉基异丙酯(MPIPMA)与过硫酸盐构成的引发体系引发丙烯酰胺的聚合。它们不仅参与氧化还原引发反应,还参与丙烯酰胺的聚合物链中,以此引发体系可以获得粘均分子量在10~7以上的聚丙烯酰胺。这些单体的水溶液在过硫酸盐作用下,很易在室温下聚合,对其轻度交联聚合物的吸水能力,及对热的行为进行了研究。
Polymerization of acrylamide initiated by the combination of 2-N-morpholinoethyl me-thacrylate (MPEMA) or 2-N-morpholinoisopropyl methacrylate (MPIPMA) with potassium persulfate were studied kinetically. The rate equations for AAM polymerization were given asRp=Kp[K2S2O8]0.5[MPEMA]0.5[AAM],Rp=Kp[K2S2O8]0.5[MPIPMA]0.5[AAM] and the overall activation energies for the above polymerizations were obtained to be 11.1 Kcal/ mol and 13.6 KCal/mol respectively. The UV analysis for the AAM polymer initiated by the above initiation systems showed that the polymerizable amines, MPEMA and MPIPMA not only join the redox initiation but also incorporate to the acrylamide polymer chains. A super high molecular weight, 107 of PAAM were obtained by using these initiation systems. Tbe water-absorptivity of hydrogels prepared from MPEMA and methylenebisacrylamide as cross-linking agent was undertaken. It was also observed that the transparency of concentrated PM-PEMA aqueous solution was sensitively depended on the temperature. Under room temperature the solution was transparent, when the temperature raised to 60℃, the solution became opaque and completely lost its transparence when temperature raised to upper 80℃.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1991年第4期415-423,共9页
Acta Polymerica Sinica
关键词
胺基
功能性
单体
聚合
MPEMA
2-N-Morpholinoethyl methacrylate, 2-N-Morpholinoisopropyl methacry-late, Redox Initiation System, Hydrogel, Temperature-response
