Preparation and properties of polysilsesquioxanes. Function and characterization of coating agents and films

Abe, Yoshimoto; Kagayama, Keiko; Takamura, Norihiro; Gunji, Takahiro; Yoshihara, Toshio; Takahashi, N.

doi:10.1016/s0022-3093(99)00614-6

Cited by 48 publications

(19 citation statements)

References 14 publications

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“…Into a four-necked flask equipped with a stirrer, a nitrogen inlet, and outlet tubes, a mixture of vinyltrimethoxysilane (VTS 12.35 g, 0.085 mol) and methanol (7 mL) were placed [14] and then cooled in an ice bath for 10 min. An aqueous hydrochloric acid solution was added drop by drop in the molar ratios of r 1 (H 2 O/VTS) = 0.86 and 1.04 and r 2 (HCl/VTS) = 0.041 and 0.051 using a 1 M HCl solution.…”

Section: Preparation Of Polyvinylsilsesquioxanesmentioning

confidence: 99%

“…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%

“…Polysilsesquioxanes are a potential candidate for novel high performance coatings, because they show an appreciable stability to self-condensation, spinnability, and film formation [16]. Abe et al [14] found that the adhesion and hardness of polyvinylsilsesquioxane coating films, regardless of the substrates, increased with increasing heating time and moreover molecular weight of polyvinylsilsesquioxane.…”

Section: Introductionmentioning

confidence: 99%

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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: Preparation Of Polyvinylsilsesquioxanesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2009

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“…The maximum adhesion value in the test for an inorganic substrate may come from the chemical bonding by the condensation between hydroxyl groups of coating films and those of glassSUS substrates Si-O-M . 9 The physical anchor effect, which is important factor for adhesion, can be considered to be negligible because of smooth substrates.…”

Section: Propertiesmentioning

confidence: 99%

Preparation of a Transition Metal Containing Polymethylsilsesquioxane Hybrids and Silicon Oxycarbide Ceramics-The Fabrication of Coating and Self-Supported Films-

Fukushima¹,

Yasuda²,

Nakamura³

et al. 2005

J. Ceram. Soc. Japan

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ஶ=Ýˁӏ ĉĐčùđđóñëèë āĐû Ê ĐèëéĘĂûóďċíñThe simple polymerization of methyltriethoxysilane MTES has been achieved by the co-hydrolysis with chemically modified tantalum or niobium alkoxides, at room temperature, within 0.5 h and under a slight catalyst. The addition of the transition metal alkoxides into MTES is found to accelerate the formation of siloxane bonds, which was confirmed by 29 Si-nuclear magnetic resonance measurement. The siloxane condensation degree of the obtained sol was found to be approximately 80!. The self-supported crack-free hybrid films could be obtained by using this solution. Crack-free ceramic films of 90 mm diameter and 0.2 mm thickness were also obtained by the pyrolysis of the above-described hybrid films. The solutions could also be used as coating precursors, allowing smooth and homogeneous coating films without cracks or pores to be obtained by the dip coating of sol to the various substrates. The adhesion between the coating films and substrates showed large values even for organic substrates, which was evaluated by a cross cut tape test. Scratch hardness was also high.

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“…Thus, strength and elastic modulus increase with the increase of the ratio of the T 3 unit. 2,8 In contrast, the hybrid with a high ratio of T 1 and T 2 units can show the flexibility and the larger elongation at fracture. In our previous report, the ratio of T 3 unit was pure PMSQࢽTa-PMSQ hybrid.…”

Section: Introductionmentioning

confidence: 99%

Oil Wettability and Sliding Properties of Organic and Inorganic Hybrid Coating Films Prepared from Methyltriethoxysilane and Various Metal Alkoxides

Fukushima

Yasuda

Kita

et al. 2006

J. Ceram. Soc. Japan

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The oil wettability and sliding property of polymethylsilsesquioxane PMSQ based organic inorganic hybrid coating films prepared from methyltriethoxysilane and various metal alkoxide were investigated. The wettability of oil increased in the order of PMSQࢻTa-ࢻTi-ࢻAl-PMSQ, and was strongly affected by the surface roughness. The friction coefficient showed that Ti-PMSQ among hybrid coating films was the lowest value, which was found to be due to the presence and maintenance of the lubricating oil film during the sliding tests.

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Preparation and properties of polysilsesquioxanes. Function and characterization of coating agents and films

Cited by 48 publications

References 14 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

Preparation of a Transition Metal Containing Polymethylsilsesquioxane Hybrids and Silicon Oxycarbide Ceramics-The Fabrication of Coating and Self-Supported Films-

Oil Wettability and Sliding Properties of Organic and Inorganic Hybrid Coating Films Prepared from Methyltriethoxysilane and Various Metal Alkoxides

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