A composition comprising a silicon-based polymer, and a derivatized carbon nano-particle is provided. Further, a method for coating a substrate, coated substrates and articles comprising a substrate coated with the composition are provided.

A dihaloorganosilane is represented by the formula (I): Each X independently represents Cl, Br, or I. Each Ar.sup.1 independently represents a phenylene group optionally substituted by 1 to 4 alkyl groups selected from methyl or ethyl. Each R.sup.1 independently represents an alkylene group having from 2 to 18 carbon atoms. Each R.sup.2 independently represents methyl or ethyl. Each R.sup.3 independently represents an alkylene group having from 1 to 18 carbon atoms. Each R.sup.4 independently represents an alkylene group having from 2 to 18 carbon atoms, and n is an integer in a range of 0 to 5, inclusive. Ionic organosilanes preparable from the dihaloorganosilanes are represented by the formula (II): Membrane compositions and membranes containing the ionic organosilanes are also disclosed.

##STR00001##

A dihaloorganosilane is represented by the formula (I): Each X independently represents Cl, Br, or I. Each Ar.sup.1 independently represents a phenylene group optionally substituted by 1 to 4 alkyl groups selected from methyl or ethyl. Each R.sup.1 independently represents an alkylene group having from 2 to 18 carbon atoms. Each R.sup.2 independently represents methyl or ethyl. Each R.sup.3 independently represents an alkylene group having from 1 to 18 carbon atoms. Each R.sup.4 independently represents an alkylene group having from 2 to 18 carbon atoms, and n is an integer in a range of 0 to 5, inclusive. Ionic organosilanes preparable from the dihaloorganosilanes are represented by the formula (II): Membrane compositions and membranes containing the ionic organosilanes are also disclosed.

##STR00001##

A mixed composition including an organosilicon compound (A) in which at least one trialkylsilyl group-containing molecular chain and at least one hydrolyzable group are bonded to a silicon atom, a metal compound (B), an acid (C), and water (D), in which a molar ratio (C/D) of the acid (C) to the water (D) is 0.002 to 0.15.

A mixed composition including an organosilicon compound (A) in which at least one trialkylsilyl group-containing molecular chain and at least one hydrolyzable group are bonded to a silicon atom, a metal compound (B), an acid (C), and water (D), in which a molar ratio (C/D) of the acid (C) to the water (D) is 0.002 to 0.15.

The present invention aims to provide: a novel silicon-containing polymer that is alkali soluble or is soluble in an alkaline aqueous solution by using heat, etc.; a film-forming composition including the silicon-containing polymer; a method for forming a silicon-containing polymer coating using the film-forming composition; a method for forming a silica coating using the film-forming composition; and a production method for the silicon-containing polymer. The silicon-containing polymer including at least either a polysiloxane chain or oligosiloxane chain or a polysilane chain or oligosilane chain in the molecular chain thereof has a group that has e.g., a carboxy or carboxylic acid ester group and a sulfide group, introduced to the molecular chain as a result of an ene-thiol reaction.

The present invention aims to provide: a novel silicon-containing polymer that is alkali soluble or is soluble in an alkaline aqueous solution by using heat, etc.; a film-forming composition including the silicon-containing polymer; a method for forming a silicon-containing polymer coating using the film-forming composition; a method for forming a silica coating using the film-forming composition; and a production method for the silicon-containing polymer. The silicon-containing polymer including at least either a polysiloxane chain or oligosiloxane chain or a polysilane chain or oligosilane chain in the molecular chain thereof has a group that has e.g., a carboxy or carboxylic acid ester group and a sulfide group, introduced to the molecular chain as a result of an ene-thiol reaction.

Synthesis of silanes with more than three silicon atoms are disclosed (i.e., Si.sub.nH.sub.(2n+2) with n=4-100). More particularly, the disclosed synthesis methods tune and optimize the isomer ratio by selection of process parameters such as temperature, residence time, and the relative amount of starting compounds, as well as selection of proper catalyst. The disclosed synthesis methods allow facile preparation of silanes containing more than three silicon atoms and particularly, the silanes containing preferably one major isomer. The pure isomers and isomer enriched mixtures are prepared by catalytic transformation of silane (SiH.sub.4), disilane (Si.sub.2H.sub.6), trisilane (Si.sub.3H.sub.8), and mixtures thereof.

Synthesis of silanes with more than three silicon atoms are disclosed (i.e., Si.sub.nH.sub.(2n+2) with n=4-100). More particularly, the disclosed synthesis methods tune and optimize the isomer ratio by selection of process parameters such as temperature, residence time, and the relative amount of starting compounds, as well as selection of proper catalyst. The disclosed synthesis methods allow facile preparation of silanes containing more than three silicon atoms and particularly, the silanes containing preferably one major isomer. The pure isomers and isomer enriched mixtures are prepared by catalytic transformation of silane (SiH.sub.4), disilane (Si.sub.2H.sub.6), trisilane (Si.sub.3H.sub.8), and mixtures thereof.

A photo-curable liquid composition for additive manufacturing of silicon-containing carbide ceramic includes a polymethylvinylsilane (PMVS) resin that has photo-reactivity over a first photo-wavelength absorption range and a photo-initiator additive mixed with the PMVS resin. The photo-initiator additive has photo-reactivity over a second photo-wavelength absorption range that has an overlapping wavelength range with the first photo-wavelength absorption range. The PMVS and the photo-initiator additive are reactive to polymerize upon exposure to radiation having a wavelength in the overlapping wavelength range.