Fabrication and Characterization of an Organic‐Inorganic Gradient Surface made by Polymethylsilsesquioxane (PMSQ)

Liu, Haiyun; Xu, Jie; Li, Yanfang; Li, Baiyu; Ma, Jun; Zhang, Xiaoli

doi:10.1002/marc.200600372

Cited by 40 publications

(27 citation statements)

References 46 publications

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“…The latter means that an interface transfers loading from matrix to dispersion phase, carries over electrons and phonons, and transports thermal energy efficiently. An exceptional interface region from inorganic to organic can be as long as a few centimeters, 15 but it is oen difficult to measure an interface thickness in polymer nanocomposites.…”

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confidence: 99%

Covalently bonded interfaces for polymer/graphene composites

et al. 2013

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The interface is well known for taking a critical role in the determination of the functional and mechanical properties of polymer composites. Previous interface research has focused on utilising reduced graphene oxide that is limited by a low structural integrity, which means a high fraction is needed to produce electrically conductive composites. By using 4,4 0 -diaminophenylsulfone, we in this study chemically modified high-structural integrity graphene platelets (GnPs) of 2-4 nm in thickness, covalently bondedGnPs with an epoxy matrix, and investigated the morphology and functional and mechanical performance of these composites. This covalently bonded interface prevented GnPs stacking in the matrix. In comparison with unmodified composites showing no reduction in electrical volume resistivity, the interface-modified composite at 0.489 vol% GnPs demonstrates an eight-order reduction in the resistivity, a 47.7% further improvement in modulus and 84.6% in fracture energy release rate.Comparison of GnPs with clay and multi-walled carbon nanotubes shows that our GnPs are more advantageous in terms of performance and cost. This study provides a novel method for developing interface-tuned polymer/graphene composites.

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confidence: 99%

Covalently bonded interfaces for polymer/graphene composites

et al. 2013

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“…Comparable results were obtained with polysiloxanes in refs. Yang et al and Liu et al [12,15] Figure 6 shows also the siloxane structures with its crucial functional groups that influence the wettability. The contact angles of water and diiodomethane were used to calculate the surface free energy of the surfaces of the coated alumina plates.…”

Section: Contact Angle and Surface Structurementioning

confidence: 99%

“…[12] This effect is reported in the literature mostly to develop polysiloxane based membranes or thin films with gradient surface characteristics from hydrophobic to hydrophilic by varying the content of methyl-or phenyl-groups locally or by pyrolyzing the samples with a temperature gradient. [12][13][14][15][16] In this work, we describe a method to produce open cellular alumina foams with varying surface characteristics from hydrophobic to hydrophilic by coating with a filler-loaded pre-ceramic polymer system and pyrolyzing at different temperatures under inert gas atmosphere. Subsequently, the foams were tested in a multi-phase mixing process, since the combination of the modified surface characteristics of the foam structures and their excellent tortuosity might be useful as reactor installations in multiphase systems for dispersing immiscible liquid phases.…”

Section: Introductionmentioning

confidence: 99%

Tailored Surface Properties of Ceramic Foams for Liquid Multiphase Reactions

et al. 2017

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Open cellular ceramic foams are prepared using the replica method. In a second step, these foams are coated with a pre-ceramic or polymer-derived ceramic coating, respectively. Polymer-to-ceramic transformation is studied by SEM with respect to the microstructure, functional groups are characterized by Raman microscopy, density and porosity are determined by pycnometer measurements as well as the surface free energy by means of contact angle measurements. By pyrolysis at different temperatures between 403 and 1273 K, the surface wettability is adjusted in a wide range from hydrophilic to hydrophobic due to the release of organic groups from the pre-ceramic polymers in terms of polymer-toceramic transformation. Coated foams are tested in a new potential application: as reactor internals to increase the liquid-liquid interface area in a homogeneously catalyzed multiphase system. As model reaction, a reactive extraction of an organic dye was used and the influence of the surface energy of the foam on the phase dispersion/reaction rate is discussed. The coated foams are able to increase the reaction rate to an extent depending on the surface wettability.

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“…FGMs are of interest to the study of orchestrated responsive behaviors, aerospace materials, and photoelectric and nuclear energy conversion materials [3][4][5][6]. Despite that FGMs are well known in the field of ceramics, metals, and other inorganic materials [7], functional gradient polymeric materials (FGPMs) have been extensively used because of their excellent properties, such as optical properties and mechanical stress relaxation [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on self-organized gradient film obtained from poly(3-[tris(trimethylsilyloxy)silyl] propyl methacrylate-co-methyl methacrylate)/poly(methyl methacrylate-co-n-butyl acrylate) blend latexes

Zhang

et al. 2012

Colloid Polym Sci

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The effect of annealing on the self-organized morphology and component gradient distribution of films prepared from bimodal latexes blend containing 1:1 siliconcontaining acrylate copolymer/silicon-free acrylate copolymer blend was studied using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy with X-ray energy-dispersive (SEM-EDX) spectrometry, and atomic force microscopy (AFM). The distribution of silicon through the whole thickness of the film as a function of annealing was investigated using confocal Raman spectroscopy (CRS). AFM results show that poly(methyl methacrylate-co-n-butyl acrylate) latex fuses to form a continuous film at 25°C. The wettability of the acrylate components and the heterogeneous composition of poly(3-[tris(trimethylsilyloxy)silyl] propyl methacrylate-co-methyl methacrylate) result in a graded block film. ATR-FTIR and SEM-EDX measurements reveal silicon-containing components segregate at the film-air interface upon annealing. CRS further shows that the nonlinear model gradient distribution of silicon is obtained, where the content of silicon component is enhanced and it gradually varies in the bulk. When the annealing temperature increases to 120 and 180°C, blend latexes films demonstrate varying topography and phase images, indicating phase separation is induced by annealing. Furthermore, CRS implies that the destruction of the gradient structure is attributed to the phase separation of the two blend components.

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Fabrication and Characterization of an Organic‐Inorganic Gradient Surface made by Polymethylsilsesquioxane (PMSQ)

Cited by 40 publications

References 46 publications

Covalently bonded interfaces for polymer/graphene composites

Covalently bonded interfaces for polymer/graphene composites

Tailored Surface Properties of Ceramic Foams for Liquid Multiphase Reactions

Effect of annealing on self-organized gradient film obtained from poly(3-[tris(trimethylsilyloxy)silyl] propyl methacrylate-co-methyl methacrylate)/poly(methyl methacrylate-co-n-butyl acrylate) blend latexes

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