Preparation of pH-sensitive core-shell organic corrosion inhibitor and its release behavior in simulated concrete pore solutions
Preparation of pH-sensitive core-shell organic corrosion inhibitor and its release behavior in simulated concrete pore solutions
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pH敏感核壳有机缓蚀剂的制备及其在模拟混凝土孔隙溶液中的释放行为
DOI：
10.1016/j.matdes.2017.01.063
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发表时间：
2017-04-05
影响因子：
8.4
通讯作者：
Hu, Jie
中科院分区：
文献类型：
--
作者：
Zhu, Yangyang;Ma, Yuwei;Hu, Jie
本文成功制备了基于聚环氧乙烷-b-聚苯乙烯（PEO-b-PS）共聚物的核壳型有机缓蚀剂（COCI）。采用紫外分光光度法研究了COCI中保留的苯并三唑（BTA）在不同pH值的去离子水和模拟混凝土孔（SCP）溶液中的释放过程，并通过动态光散射测量和SEM结合EDS测定了COCI释放前后的尺寸和形貌。在pH值较低的去离子水中，BTA的释放量略高（9%），这与低pH环境下PEO部分氧基的质子化程度较高，COCI结构不致密有关。在SCP溶液中，BTA释放过程的pH敏感性更为明显，pH值为13的SCP溶液中BTA的释放量比pH值低于11的SCP溶液低5倍。最合理的原因是在pH值为13的SCP溶液中，Ca2+的存在和高碱性环境有利于COCI的团聚和COCI周围富na层的形成，阻碍了保留BTA的扩散速率和随后的释放过程。(C) 2017 Elsevier Ltd.版权所有。
In this paper, core-shell organic corrosion inhibitors (COCI) based on poly(ethylene oxide)-b-polystyrene (PEO-b-PS) copolymers were successfully prepared. The release process of benzotriazole (BTA) reserved in COCI was investigated by UV spectrophotometry in deionized water and simulated concrete pore (SCP) solutions with different pH values, and the size and morphology of COCI were determined by dynamic light scattering measurements and SEM combined with EDS before and after the release process. The release amount of BTA was slightly higher (9%) in deionized water with lower pH values, which was related to the higher protonation degree of oxygen groups in PEO moieties and less compact structure of COCI at lower pH environment. In SCP solutions, the pH sensitivity of BTA release process was more pronounced, evidenced by 5 times lower release amount of BTA in SCP solution with a pH value of 13, compared to SCP solutions with pH values lower than 11. The most plausible reason is that in SCP solution with a pH value of 13, the existence of Ca2+ and high alkaline environment are beneficial for the agglomeration of COCI and formation of Na-rich layer around COCI, hindering the diffusion rate and subsequently release process of the reserved BTA. (C) 2017 Elsevier Ltd. All rights reserved.