摘要
采用反相悬浮聚合法合成了聚（丙烯酸-丙烯酰胺）（P（AA-AM））高吸水剂。采用N，N’-亚甲基双丙烯酰胺为交联剂，合成了交联剂摩尔分数分别为0．0247％，0．0536％，0．0779％的3种不同的P（AA-AM）。通过对P（AA-AM）的溶胀动力学测试，研究了交联剂摩尔分数和溶胀介质对溶胀性能的影响，以及初始溶胀速率，溶胀速率常数。溶胀指数，溶胀系数和溶胀介质在水凝胶体系内的扩散行为。结果表明，P（AA-AM）在去离子水中的溶胀度为150-752g／g，在质量分数为3．0％的NaCl水溶液中的溶胀度仅为31～43g／g，其溶胀凝胶中的平衡含水率为95．24％～99．86％；溶胀速率常数随交联剂浓度、介质盐浓度的增大而增大；随着溶胀介质盐浓度的增大，溶胀指数减小，而溶胀常数却增大；吸水过程符合非Fick扩散，水的传输机理受扩散控制和松弛控制两种作用的共同影响，但松弛控制起主导作用。
Superabsorbent resin P （AA- AM） was prepared by reverse polymerization in aqueous solution of acrylamide. Three different P（AA- AM） were synthesized using multifunctional crossliker- N, N＇ - methylenebisacrylamide with mole fraction of 0. 024 7 % ,0. 053 6 % ,0. 077 9 % respectively. In the dynamic swelling test, the influence of crosslimker mole fraction and salt in the swelling environment on the swelling properties, the initial swelling rate, swelling rate constant, swelling exponent, swelling coefficients and diffusional behaviour in the hydrogel systems were examined. The results show that swelling ratio of P（AA-AM） is 150--752 g/g in ion - free water, while swelling ratio is 31-43 g/g n NaC1 aqueous solution with the mass fraction of 3.0%. The equilibrium water content is in the range of 95.24 % -99.86 %, swelling rate constant increases with the increase of crosslink agent and the salt in the environment, with the increase of the salt in the environment, the swelling exponent decreases, but the swelling constant increases. The water intake of hydrogels follows a non Fickian type diffttsion, transport of all hydrogels is anomalous and its transport mechanism is dominated by a combination of diffusion - controlled and relaxation - controlled systems, but the relaxation controlled effect predominates.
出处
《石油化工高等学校学报》
EI
CAS
2006年第4期51-55,共5页
Journal of Petrochemical Universities
