Structural control and properties of low‐dielectric‐constant poly(hydrogen silsesquioxane) precursors and their thin films

Liu, Wei-Chih; Yu, Yang‐Yen; Chen, Wen‐Chang

doi:10.1002/app.13446

Cited by 20 publications

(8 citation statements)

References 25 publications

(45 reference statements)

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“…Polysilsesquioxanes with a formula of (RSiO 3/2 ) n are increasingly being considered as an alternative to siloxane in applications where high strength, thermal stability, or chemical resistance is a premium [10,11]. Polysilsesquioxanes used as coatings [12][13][14][15] are commonly synthesized through preparing prepolymers based on acid-catalyzed hydrolysis and condensation of organotrialkoxysilanes or organotrichlorosilanes. The hydrolysis of alkoxysilanes leads to the formation of silanol.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

2009

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Polyvinylsilsesquioxanes (PVS) coatings were synthesized by the hydrolytic polycondensation of vinyltrimethoxysilane using hydrochloric acid as a catalyst. Their structure was characterized by Fourier transform IR (FTIR) and the viscosity [in centipoise(cP)] of polyvinylsilsesquioxanes was measured at 298 K. The electrochemical behavior of I-IV coated steel electrodes, of polymer concentration as follows: [I(20%), II(40%) of viscosity 50 cP and III(20%), IV(40%) of viscosity 15 cP], was investigated in 3% NaCl solution using various electrochemical techniques, i.e., opencircuit potential (OCP), potentiodynamic polarization, electrochemical impedance measurements (EIS), and surface examination via scanning electron microscope (SEM) technique. The influence of immersion time on the electroctrochemical behavior of polysilsesquioxane-coated electrodes was also studied. The results of polarization measurements showed that corrosion current density (i corr ) decreases in the order IV [ III [ II [ I. Also, the film resistance is the highest for PVS-coated electrode I as evaluated from EIS measurements. OCP, EIS, and polarization results are in good agreement with each other. The obtained results were confirmed by surface examination using scanning electron microscope.

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Section: Introductionmentioning

confidence: 99%

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

2009

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“…The modified material has the dual advantages of inorganic nanomaterials and organic polymer materials. POSS can improve the thermal stability [4,6,9,10,11,12], mechanical properties [4,6,12,13,14], hydrophobicity [15,16,17], flame retardancy [18,19,20], and dielectric properties [21,22,23] of the polymer at the molecular level; this modification method has been widely studied by researchers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymethylsilsesquioxane Content to the Thermal Stability of Meta-Aramid Fiber Insulation Paper

et al. 2018

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Polymethylsilsesquioxane (PMSQ) nanoparticles with mass percentages of 0, 2.5, 5.0, 7.2, 9.4 wt %, respectively, were constructed by molecular dynamics methods in this paper. Composite molecular models were established using PMSQ and MPIA (poly-metaphenylene isophthalamide) fiber. The influence of different PMSQ contents on the thermal stability of meta-aramid insulation paper was analyzed from the parameters of mechanical property, interaction energy, and mean square displacement. The results showed that the trend of mechanical properties decreased with the increase of PMSQ content. When the PMSQ content was 2.5 wt %, the mechanical properties of the composited model were the best, which was about 24% higher than that of the unmodified model. From an intermolecular bonding and nonbonding point of view, the energy parameters of composite model with the 2.5 wt % content was better than those of the composite model with other contents. Therefore, it is considered that MPIA can interact better with the 2.5 wt % content PMSQ composite model. When the PMSQ content is 2.5 wt %, the overall chain movement in the composite model is slower than that of the unmodified model, which can effectively inhibit the diffusion movement of the MPIA chain. In general, the thermal stability of composite molecular models MPIA and PMSQ (2.5 wt %) was better improved.

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“…Surface and interfacial properties lie at the heart of many potential POSS applications, but information on the surface properties of POSSs is limited . Furthermore, POSSs have a low dielectric constant because of their porosity . Incorporation of a POSS into a polymer can reduce the dielectric constant of a nanocomposite …”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization, and properties of poly(aryl ether sulfone) systems with double-decker silsesquioxane in the main chains by reactive blending

Zhang

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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A series of copoly(aryl ether sulfone)s containing double-decker-shaped silsesquioxane (DDSQ) in the main chain was prepared. Toward this end, a novel diphenol polyhedral oligomeric silsesquioxane macromer was synthesized by hydrosilylation between 3,13-dihydro octaphenyl double-decker silsesquioxane (denoted dihydro DDSQ) and eugenol. The poly(aryl ether sulfone)s were synthesized from diphenol DDSQ, bisphenol A (BPA), and 4-fluorophenyl sulfone using a onestep high-temperature solution method. By adjusting the ratio of diphenol DDSQ to BPA, copolymers with variable DDSQ content in the main chains were obtained. With increased DDSQ content in the main chain, the glass transition temperature decreased based on differential scanning calorimetry, and anti-degradation was enhanced based on thermogravimetric analysis. Moreover, the dielectric constant j of pure polymer (3.19 at 1 MHz) initially increased to 4.04 (DDSQ molar ratio 5 10%), and then decreased to 2.68 at 1 MHz (DDSQ molar ratio 5 100%). Crystallization behavior, solubility, and surface hydrophobicity were also investigated. V C 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 780-788

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Structural control and properties of low‐dielectric‐constant poly(hydrogen silsesquioxane) precursors and their thin films

Cited by 20 publications

References 25 publications

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

Influence of Polymethylsilsesquioxane Content to the Thermal Stability of Meta-Aramid Fiber Insulation Paper

Preparation, characterization, and properties of poly(aryl ether sulfone) systems with double-decker silsesquioxane in the main chains by reactive blending

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