硅烷改性氧化石墨烯-聚羧酸复合物的合成及性能

王琴; 李时雨; 潘硕; 郭紫薇

doi:10.1016/S1872-5805(18)60330-0

硅烷改性氧化石墨烯-聚羧酸复合物的合成及性能

doi: 10.1016/S1872-5805(18)60330-0

北京建筑大学土木与交通工程学院, 建筑结构与环境修复功能材料北京市重点实验室, 北京 100044

基金项目: 国家自然科学基金（00881915021）；北京市自然科学基金（8182014）.

详细信息

通讯作者:
王琴,副教授.E-mail:wangqin@bucea.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-25
- 录用日期: 2018-04-28
- 修回日期: 2018-04-03
- 刊出日期: 2018-04-28

Synthesis and properties of a silane and copolymer-modified graphene oxide for use as a water-reducing agent in cement pastes

Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, University of Civil Engineering and Architecture, Beijing 100044, China

Funds: National Natural Science Foundation of China (00881915021); Beijing Natural Science Foundation(8182014).

摘要

摘要: 氧化石墨烯能显著增强增韧水泥基复合材料，但会对水泥浆体的流动性能带来负面影响。通过硅烷偶联剂乙烯基三甲氧基硅烷对氧化石墨烯（GO）进行改性，制备出带有乙烯基的硅烷改性氧化石墨烯（S-GO），将S-GO与羧酸单体进行共聚合反应，得到硅烷改性氧化石墨烯-聚羧酸复合物（P-S-GO）。利用FTIR与XRD等手段对GO、S-GO与P-S-GO的微观结构、元素组成及分散性进行表征；同时，将P-S-GO掺入水泥净浆中，测试其流动度与流变性能。结果表明：硅烷偶联剂能通过缩合反应成功接枝到氧化石墨烯上，形成富含活性双键的氧化石墨烯，并通过与羧酸单体和大单体的共聚合反应，合成P-S-GO复合物。与GO相比，P-S-GO在水泥浆体系中有着更良好的分散能力；将P-S-GO掺入水泥浆中可以有效改善GO对于水泥浆体工作性的负面影响，改善流动度与流变性能。
- 氧化石墨烯 /
- 硅烷偶联剂改性 /
- 流动度 /
- 流变性能
Abstract: The addition of graphene oxide (GO) to cement paste significantly increases its toughness, however its fluidity is adversely affected. GO was first reacted with vinyltrimethoxysilane to produce a silane-modified graphene oxide (S-GO), which was then copolymerized with acrylic acid and a water reducing agent, isobutaenol polyoxyethylene ether (molecular mass 2400), to obtain a silane and copolymer-modified GO (P-S-GO) which acted as a water-reducing agent of the cement paste. A copolymer without GO was prepared under the same conditions for comparison. The structure, elemental composition and dispersibility of GO, S-GO and P-S-GO in a simulated cement environment (saturated lime water) were investigated by FTIR, XRD and a sedimentation test. The fluidity and rheology of the cement pastes with added GO, copolymer or P-S-GO were investigated. Results showed that vinyltrimethoxysilane reacted with the -OH group on the GO sheets to form an ether bond and the copolymer was grafted onto a vinyl group of S-GO by an addition reaction to produce the P-S-GO. The P-S-GO has a better dispersibility in saturated lime water with a negligible amount of aggregation compared to GO and a significant agglomeration occurs for GO. The addition of the P-S-GO to the cement pastes improves the fluidity and rheological properties compared with GO, offsetting the negative impact of GO and increasing the toughness of the resulting cements.
- Graphene oxide /
- Silane coupling agent modified /
- Fluidity /
- Rheological property

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参考文献(23)

Alaa M. Rashad. A comprehensive overview about the effect of nano-SiO₂ on some properties of traditional cementitious materials and alkali-activated fly ash[J]. Construction and Building Materials, 2014, 52:437-464.

Yang R H, Wen X L, ShuH Y, et al. Performance Influence of composite nano-materials on concrete and cement mortar[J]. Journal of Chongqing Jianzhu University, 2007, 29(5):144-148.

Arkles B. Tailoring surfaces with silanes[J]. Chemtech, 1977, 7(12):766-778.

Wang Q, Wang J, Lu C X, et al. Influence of graphene oxide additions on the microstructure and mechanical strength of cement[J]. New Carbon Materials, 2015, 30(4):349-356.

Peyvandi, Amirpasha. Surface-modified graphite nanomaterials for improved reinforcement efficiency in cementitious paste[J]. Carbon, 2013, 63(2):175-186.

Lv S H, Deng L J, Yang W Q, et al. Fabrication of polycarboxylate/graphene oxide nanosheet composites by copolymerization for reinforcing and toughening cement composites[J]. Cement & Concrete Composites, 2016, 66:1-9.

Yan JL, Chen G J, Cao J, et al. Functionalized graphene oxide with ethylenediamine and 1,6-hexanediamine[J]. New Carbon Materials, 2012, 52(5):624-624.

杨永岗, 陈成猛, 温月芳, 等. 氧化石墨烯及其与聚合物的复合[J]. 新型炭材料, 2008, 23(3):193-200. (YANG Yong-gang, CHE Cheng-meng, WEN Yue-fang, et al. Oxidized graphene and graphene based polymer composites[J]. New Carbon Materials, 2008, 23(3):193-200.)

时镜镜, 马文石, 林晓丹. KH-570功能化石墨烯的制备与表征[J]. 无机化学学报, 2012, 28(1):131-136. (SHI Jing-jing, MA Wen-shi, LINXiao-dan. Synthesis and characterization of functionalized graphene with KH-570[J]. Chinese Journal of Inorganic Chemistry, 2012, 28(1):131-136.)

Kim H M, Lee H S. Water and oxygen permeation through transparent ethylene vinyl alcohol/(graphene oxide) membranes[J]. Carbon Letters, 2014, 15(1):50-56.

Yang Z, Chen X H, Liu Y Q, et al. Study of carbon nanotubes methylolated and grafted with maleic anhydride[J]. Acta Chimica Sinica, 2006, 64(3):203-207.

Choi S, Hwang D K, Lee H S. Thermal properties in strong hydrogen bonding systems composed of poly(vinyl alcohol), polyethyleneimine, and graphene oxide[J]. Carbon Letters, 2014, 15(4):282-289.

Li Y, Guo H, Zhang Y, et al. Synthesis of copolymers with cyclodextrin as pendants and its end group effect as superplasticizer[J]. Carbohydrate Polymers, 2014, 102(1):278-287.

Zhao L, Guo X, Ge C, et al. Investigation of the effectiveness of PC@GO on the reinforcement for cement composites[J]. Construction & Building Materials, 2016, 113:470-478.

Kong X M, Shi Z, Lu Z. Synthesis of novel polymer nano-particles and their interaction with cement[J]. Construction & Building Materials, 2014, 68(4):434-443.

Wang Qin, Cui Xin-you, Wang Jian, et al. Effect of fly ash on rheological properties of graphene oxide cement paste[J]. Construction & Building Materials, 2017, 138:35-44.

Wang Q, Wang J, Lv C X, et al. Rheological behavior of fresh cement pastes with a graphene oxide additive[J]. New Carbon Materials, 2016, 31(6):574-584.

Shang Y, Zhang D, Yang C, et al. Effect of graphene oxide on the rheological properties of cement pastes[J]. Construction & Building Materials, 2015, 96:20-28.

Zhang Y R, Kong X M, Hou SS, et al. Study on the rheological properties of fresh cement asphalt paste[J]. Construction & Building Materials, 2012, 27(1):534-544.

Zhang YR, Kong X M, Lu ZC, et al. Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism[J]. Cement & Concrete Research, 2016, 87:64-76.

张力冉, 王栋民, 潘佳, 等. 新拌水泥浆体絮凝结构与流变行为及有效体积分数的关系[J]. 硅酸盐学报,2014,42(9):1209-1218. (ZHANG Li-ran, WANG Dong-min, PAN Jia, et al. Relationship between flocculent structures and rheological behavior/effective volume fraction of fresh cement paste[J]. Journal of the Chinese Ceramic Society, 2014, 42(9):1209-1218.)

Khayat K H,Yahia A, Sayed M. Effect of supplementary cementitious materials on rheological properties, bleeding,and strength of structural grout[J]. Aci Materials Journal, 2008, 105(6):585-593.

Zhang X, Zhang L. Application of rheological theory in cement-based materials[J]. Fly Ash Comprehensive Utilization, 2013, (4):9-13.

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