Improved dielectric and mechanical properties of silica/epoxy resin nanocomposites prepared with a novel organic–inorganic hybrid mesoporous silica: POSS–MPS

Wang, Lei; Lv, Panpan; Cui, Yonghong; Miao, Jie

doi:10.1016/j.matlet.2014.05.010

Cited by 38 publications

(23 citation statements)

References 17 publications

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“…The OA-POSS weight to be added was computed as if 3-5% by weight of the (FeCO 3 + OA-POSS) blend should be added to incorporate in a 50 μm thick FeCO 3 film since POSS moieties appears to be most efficient in these ranges. 30,35,36 Moreover, lower loadings similar to the ones used in CI administration in the order of the ppm were also tested.…”

Section: Discussionmentioning

confidence: 99%

Siderite micro-modification for enhanced corrosion protection

et al. 2017

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Production of oil and gas results in the creation of carbon dioxide (CO2) which when wet is extremely corrosive owing to the speciation of carbonic acid. Severe production losses and safety incidents occur when carbon steel (CS) is used as a pipeline material if corrosion is not properly managed. Currently corrosion inhibitor (CI) chemicals are used to ensure that the material degradation rates are properly controlled; this imposes operational constraints, costs of deployment and environmental issues. In specific conditions, a naturally growing corrosion product known as siderite or iron carbonate (FeCO3) precipitates onto the internal pipe wall providing protection from electrochemical degradation. Many parameters influence the thermodynamics of FeCO3 precipitation which is generally favoured at high values of temperatures, pressure and pH. In this paper, a new approach for corrosion management is presented; micro-modifying the corrosion product. This novel mitigation approach relies on enhancing the crystallisation of FeCO3 and improving its density, protectiveness and mechanical properties. The addition of a silicon-rich nanofiller is shown to augment the growth of FeCO3 at lower pH and temperature without affecting the bulk pH. The hybrid FeCO3 exhibits superior general and localised corrosion properties. The findings herein indicate that it is possible to locally alter the environment in the vicinity of the corroding steel in order to grow a dense and therefore protective FeCO3 film via the incorporation of hybrid organic-inorganic silsesquioxane moieties. The durability and mechanical integrity of the film is also significantly improved.

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Section: Discussionmentioning

confidence: 99%

Siderite micro-modification for enhanced corrosion protection

et al. 2017

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“…Silsesquioxanes are typical organic-inorganic materials and can be incorporated into almost any kind of thermoplastic or thermosetting polymer to improve their properties 4 . Epoxy/silsesquioxane hybrids present improvements in thermal stability 5 , dielectric properties 6 , corrosion resistance 7 , and mechanical properties 8 , as well as reduced flammability 9 , in comparison with neat epoxy resin. In this context, increases in glass transition temperature (T g ) with chemical modifications of epoxy matrixes by random 10 or organized 11 structures with polysilsesquioxanes are scarcely reported.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Nanocomposites Based on Epoxy/silsesquioxanes Matrices Reinforced with Multi-walled Carbon Nanotubes

2015

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“…This is partly because that the composites prepared with organic mesostructured silica exhibit higher void volume content than the composites prepared with inorganic corresponding silica. 14,15 Moreover, the methacryloyloxy groups grafting on the surface of mesostructured silica improve the interface interaction between inorganic silica scaffold and polymer matrix and confine the segmental motion of PMMA. This implies that the reduction of the dielectric constants is not only attributed to the void volume stored within the MPS/polymer composites but also the movement of polymer chain segments.…”

Section: Dielectric Properties Of Mps/pmma Compositesmentioning

confidence: 99%

Effects of framework structure and coupling modification on the properties of mesoporous silica/poly(methyl methacrylate) composites

Wang

et al. 2014

Journal of Reinforced Plastics and Composites

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Mesoporous silicas (MPSs) with two-dimensional (2D) hexagonal framework (SBA-15) and worm-hole framework (MSU-J) were synthesized with poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (P123) and a,o-polyoxypropylene diamine (D2000) as templates, respectively. Both SBA-15 and MSU-J were further modified with g-(methacryloyloxy) propyl trimethoxy silane (MAPTS) via post-grafting to prepare organic mesoporous silicas (denoted SBA-15-G and MSU-J-G, respectively) with -C ¼ C groups on the surface of mesopores. All mesoporous silicas were employed as filler to prepare improved poly(methyl methacrylate) (PMMA) composites with lower dielectric constant, higher thermal, and mechanical properties. It was found that all mesoporous silicas retained their mesostructure in MPS/PMMA composites to introduce a lot of voids into the composites. So, the dielectric constant of composites decreased with the loading of mesoporous silica and their organic derivatives increased. Also, all composites exhibited stabilized dielectric constant with lower value in comparison to pure PMMA over the whole frequency from 1 to 160 MHz. Specifically, with the addition of MPS to PMMA, the dielectric constants of the composite can be reduced from 2.91 of the pure PMMA to 2.73 and 2.64 by incorporating 4 wt% SBA-15 and 7 wt% MSU-J, respectively. All the composites exhibited improved mechanical properties, glass transmission temperature (T g ), and thermal stability in comparison to PMMA. All these differences in macro-properties are attributed to the different structure between MPS/PMMA composites and PMMA. MSU-J silica with the larger framework pore size provides the composite with the best improvement in dielectric, thermal, and mechanical properties.

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Improved dielectric and mechanical properties of silica/epoxy resin nanocomposites prepared with a novel organic–inorganic hybrid mesoporous silica: POSS–MPS

Cited by 38 publications

References 17 publications

Siderite micro-modification for enhanced corrosion protection

Siderite micro-modification for enhanced corrosion protection

Hybrid Nanocomposites Based on Epoxy/silsesquioxanes Matrices Reinforced with Multi-walled Carbon Nanotubes

Effects of framework structure and coupling modification on the properties of mesoporous silica/poly(methyl methacrylate) composites

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