Synthesis of Polyurethane Modified Polycarboxylate and Its Interaction with Cement Paste
XIANG Shuncheng1, ZHENG Tingxiang1, GAO Yingli1,*, SHI Wei2, JIANG Zhen3, HE Yanqi3, ZENG Wei3
1 School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410082, China 2 Hunan Provincial Science and Technology Affairs Center, Changsha 410082, China 3 China West Construction Group Co., Ltd. Hunan Branch, Changsha 410082, China
Abstract: The optimum preparation process was obtained by orthogonal experimental design. Comb-like polycarboxylates (M-PCE and O-PCE) with the same degree of polymerization of main chain and different side chain length and functional groups were synthesized by free radical polymerization. They were compared with two commercial polycarboxylates (C-PCE-1 and C-PCE-2). The adsorption behavior, fluidity, Zeta potential and surface tension of different polycarboxylates and Portland cement were analyzed, the interaction between polyurethane modified polycarboxylate (M-PCE) and cement paste was investigated. The results show that due to the incomplete hydrolysis of the siloxane group, the role of M-PCE in cement-based materials can promote cement hydration, and the other three polycarboxylates (O-PCE, C-PCE-1 and C-PCE-2) can delay the hydration due to the shielding effect of their chain alkyl. At the same time, it is found that M-PCE with siloxane group has a high Zeta potential absolute value, which can make cement concrete have excellent surface tension and fluidity, that is, the access of polyurethane side chain has a significant positive impact on the performance of polycarboxylic acid in cement paste.
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