Surface modification of superfine SiC powders by ternary modifiers-KH560/sodium humate/SDS and its mechanism

Zhang, Wenxiao; Feng, Yiyu; Niu, Yifan; Liu, Ting; Zhai, Xiaoyu; Liu, Jiaxiang

doi:10.1016/j.ceramint.2021.05.091

Cited by 17 publications

(4 citation statements)

References 60 publications

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“…When deionized water was added to the system, the primary and secondary amines of the PEI chain first reacted with the epoxy group of KH560 in deionized water. The SiOCH 3 group at the other end of KH560 molecule was hydrolyzed to SiOH, 32 which was then dehydrated and condensed with a large number of silicon hydroxyl groups on the surface of the newly added diatomite to form a new stable SiOSi bond under certain conditions (90°C, 8 h). Part of SiOH underwent self‐condensation to form a long chain crosslinked structure.…”

Section: Resultsmentioning

confidence: 99%

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Wang,

Lou,

et al. 2023

Polymer Composites

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In this study, the binding of amine‐based hyperbranched macromolecular polyethyleneimine (PEI) to diatomite (DE) was carried out by using the silane coupling agent KH560 (PEI‐KH560‐DE). Fourier infrared spectroscopy, scanning electron microscopy were used to characterize the structure of the modified DE. Then, the composites were prepared using PEI‐KH560‐DE as the filler in the epoxy resin matrix and then cured with dimethylimidazole. The cured composites were tested for impact resistance, flexural properties, and tensile properties, and then subjected to DSC. The experimental results showed that when different proportions of diatomite or modified diatomite were added to the epoxy resin matrix, the strength and toughness of the composites could be significantly enhanced. When the content of PEI‐KH560‐DE was 15 wt%, the impact strength of the composites reached the maximum value of 5.39 kJ/m2, which was 156.67% higher than that of the pure epoxy resin (2.10 kJ/m2). The tensile strength was also improved from 16.38 MPa of the pure epoxy resin to 26.55 MPa, corresponding to an increase of 62.09%. With the addition of modified diatomite, the Tdmax and char yield of the composites were significantly enhanced, indicating that the addition of diatomite can enhance the heat resistance and thermal stability of the composites. The curing kinetics study showed that the addition of PEI‐KH560‐DE can significantly reduce the apparent activation energy required for the curing reaction of epoxy resin probably due to the presence of amine group in PEI, which plays a role in promoting the curing behavior.Highlights Amine groups and flexible chain segments were introduced into diatomite. Mechanism of polyethyleneimine‐modified diatomite was investigated. Improved mechanical and thermal properties of PEI‐KH560‐DE/EP composites. Curing kinetics showed that amine groups reduce apparent activation energy.

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Section: Resultsmentioning

confidence: 99%

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Wang,

Lou,

et al. 2023

Polymer Composites

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show abstract

“…6(d)) whereby it is difficult to transfer the anionic form of the TC molecule (TC − ) to the negatively charged surface of the catalyst occurs due to the repulsive force between these two homocharged species. A higher zeta potential at pH 7 led to a more stable system; 36 that is, it could resist aggregation when dispersed. In consequence, the photodegradation occurred easily under pH 7.…”

Section: Resultsmentioning

confidence: 99%

Reuse of steel slag as a photocatalyst for tetracycline degradation: mechanism of oxygen vacancies

et al. 2023

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“…Secondly, the C 12 H 25 OSO 3 − groups of SDS will also be adsorbed on the surface of BT particles in the form of micelles, and the electrostatic repulsion between them can effectively avoid the clustering of BT particles. 17 , 33 The uniform distribution of BT particles in PVDF improves interfacial compatibility. The schematic diagrams are shown in Figures 1 G and 1H.…”

Section: Resultsmentioning

confidence: 99%

Giant flexoelectric response of uniformly dispersed BT-PVDF composite films induced by SDS-assisted treatment

Wei,

Yu,

Zuo

et al. 2023

iScience

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Surface modification of superfine SiC powders by ternary modifiers-KH560/sodium humate/SDS and its mechanism

Cited by 17 publications

References 60 publications

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Reuse of steel slag as a photocatalyst for tetracycline degradation: mechanism of oxygen vacancies

Giant flexoelectric response of uniformly dispersed BT-PVDF composite films induced by SDS-assisted treatment

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