Abstract: The hydrophobic modified alkali soluble polymer emulsion (HASE) with different content of methylacrylic ester of ethoxylated (25 EO) C22 (BEM) were synthesized by emulsion polymerization method. Through controlling the mole ratio a of NaOH/MAA to adjust the neutralization degree of MAA in the macromolecular chain , the influence of pH on the transmittance and apparent viscosity of HASE system, and the function of pH in the process of phase transition were investigated. The rheological curves were simulated with three-parametric Herschel-Buckley model equation, and the effect of pH and BEM content on the rheological behavior at the secondary increase stage of pH was discussed. The results show that the pH value slightly decreases when the molar ratio of NaOH/MAA is 0.3 to 0.6, and the hydrophilic interaction and electrostatic repulsion are in balance with hydrophobic interaction at the lowest pH, meanwhile, the HASE molecule is turned into a solution from a fully swelled latex particle. The BEM content increases, the pH of the neutralization reaction and phase transition are higher; the apparent viscosity, yield stress, consistency coefficient and rheological index all have the sensitivity of pH (about 6.7), and the more BEM content, the higher the pH of the sensitive point.
1 Dossantos Z M, Wanderley N A O, Dantas T N C, et al. European Polymer Journal, 2007, 43, 3314. 2 Wang C, Tam K C, Jenkinsb R D, et al. Physical Chemistry Chemistry Physical, 2000, 2, 1967. 3 Chen J, Xu K, Chen M C. Polymer Materials Science & Engineering, 2013, 29(4), 37(in Chinese). 陈嘉, 许凯, 陈鸣才.高分子材料科学与工程, 2013, 29(4),37. 4 Chasseniieux C, Nicolai T, Benyahia L. Current Opinion in Colloid & Interface Science, 2011, 16, 18. 5 Moraes R P, Graillat C, Jeanson G, et al. Journal of Colloid and Interface Science, 2010, 352, 19. 6 Jassal M, Acharya B N, Bajaj P. Journal of Applied Polymer Science, 2003, 89, 1430. 7 Wang C, Jiang X B, Zhu X L, et al. Acta Chimica Sinica, 2010, 68(7), 689(in Chinese). 王晨, 姜绪宝, 朱晓丽, 等. 化学学报, 2010, 68(7), 689. 8 Zhu X L, Kong X Z, Liu Y X, et al. Acta Chimica Sinica, 2008, 66(22), 2525(in Chinese). 朱晓丽, 孔祥正, 刘永祥, 等.化学学报, 2008, 66(22), 2525. 9 Kong X Z, Wang C, Jiang X B, et al. Chinese Chemical Letters, 2010, 21, 616. 10 De Souza T V, De Souza P R S, Pereira M R, et al. Progress in Organic Coatings, 2017, 106, 1. 11 Dundua A, Landfester K, Taden A. Polymer, 2014, 55, 3543. 12 Snuparek J, Quadrat O, Horsky J. Progress in Organic Coatings, 2005, 54, 99. 13 Ng W K, Tam K C, Jenkins R D. Polymer, 2001, 42, 249. 14 Chen H, Wu X Y, Ye Z B, et al. Acta Physico-Chimica Sinica, 2012, 28(4), 903(in Chinese). 陈洪, 吴晓艳, 叶仲斌, 等.物理化学学报, 2012, 28(4), 903.
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2019, Vol. 33 
