Grafting SiO2 nanoparticles on polyvinyl alcohol fibers to enhance the interfacial bonding strength with cement
Grafting SiO2 nanoparticles on polyvinyl alcohol fibers to enhance the interfacial bonding strength with cement
复制标题
聚乙烯醇纤维接枝SiO2纳米粒子增强与水泥的界面结合强度
DOI：
10.1016/j.compositesb.2019.01.034
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发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
张广宇
中科院分区：
文献类型：
--
作者：
张广宇
由于缺乏必要的物理和化学亲和力，有机纤维与无机水泥之间的界面结合强度较弱是有机纤维增强水泥面临的主要挑战。为了提高聚乙烯醇纤维与水泥的界面粘结强度，以γ-(2，3-环氧丙氧基)丙基三甲氧基硅烷(KH560)为偶联剂，在高强高模聚乙烯醇纤维上接枝了纳米二氧化硅。接枝的PVA纤维具有纳米级的粗糙表面，与水泥具有较高的化学反应活性。实验结果表明，最佳接枝率为8.5 wt%，反应时间为2 h，反应温度为110 °C，催化剂质量分数为10 wt%。用SiO_2接枝的PVA纤维作为增强剂，其在水泥中的拉伸强度和拔出粘结强度分别比纯PVA纤维提高了21%和43%。有限元分析和模拟进一步证明了PVA纤维与水泥界面行为的增强。综上所述，在PVA纤维表面接枝SiO_2纳米粒子可以提高小变形条件下与水泥的界面粘结强度，增强水泥的增强效果和抗裂性能。这一效应主要归因于纳米二氧化硅与水泥之间的协同摩擦力和化学结合力。
The weak interface bonding strength between organic fibers and inorganic cement is the main challenge for organic fiber-enhanced cement due to the lack of necessary physical and chemical affinity. In order to improve the interface bonding strength between polyvinyl alcohol (PVA) fibers and cement, SiO2nanoparticles (SiO2NPs) were grafted to high strength and high modulus PVA fibers using γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) as coupling agent. The grafted-PVA fibers were endowed with a Nano-rough surface and high chemical reactivity with cement. The orthogonal experimental results show that the optimal grafting rate between SiO2NPs and PVA fibers was 8.5 wt% with reaction time of 2 h, reaction temperature of 110 °C, and catalyst weight percentage of 10 wt%. With SiO2-grafted PVA fibers as the enhancement, their tensile strength and pullout bonding strength in cement increased up to 21% and 43% compared with pure PVA fibers, respectively. The enhancement of interfacial behavior between PVA fiber and cement was further evidenced by the finite element analysis and simulation. In conclusion, grafting SiO2NPs on PVA fibers can improve the interfacial bonding strength toward cement under small deformation, which implied the enhanced reinforcement and crack resistance for cement. This effect was primarily attributed to the synergistic friction and chemical bonding forces between SiO2NPs and cement.
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影响因子：
3.8
作者：
Andrielli Morais de Oliveira;F. Silva;E. Fairbairn;R. D. T. Filho
通讯作者：
Andrielli Morais de Oliveira;F. Silva;E. Fairbairn;R. D. T. Filho
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DOI：
10.1016/j.compositesb.2017.07.058
发表时间：
2017
期刊：
Composites Part B: Engineering
影响因子：
--
作者：
L. Wang;S.H. Zhou;Y. Shi;S.W. Tang;E. Chen
通讯作者：
E. Chen
DOI：
10.1080/00405000.2017.1329132
发表时间：
2018-01
期刊：
The Journal of The Textile Institute
影响因子：
--
作者：
H. R. Pakravan;M. Jamshidi;M. Latifi
通讯作者：
H. R. Pakravan;M. Jamshidi;M. Latifi
DOI：
10.1061/(asce)0733-9445(1988)114:8(1804
发表时间：
1988-08-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
MANDER, JB;PRIESTLEY, MJN;PARK, R
通讯作者：
PARK, R
影响因子：
5.2
作者：
Wang, Chengshuang;Xu, Feng;Wei, Jun
通讯作者：
Wei, Jun