摘要:
An alkoxy-functional organopolysiloxane resin and polymer is disclosed that comprises the reaction product of a reaction of (i) an alkenyl-functional siloxane resin comprising R3SiO1/2 units and SiO4/2 units; (ii) an alkoxysilane-functional organosiloxane compound having at least one silicon-bonded hydrogen atom at a molecular terminal; (iii) an endcapper according to the formula to the formula R23Si—(R22SiO)s—SiR22H or R23Si—(R22SiO)t—(HR2SiO)—SiR23, or combinations thereof; and (iv) a polyorganosiloxane having an average, per molecule, of at least 2 aliphatically unsaturated organic groups in the presence of a (v) hydrosilylation catalyst. In this alkoxy-functional organopolysiloxane resin and polymer, each R2 is independently a hydrocarbon radical and the subscripts s and t independently have values ranging from 0 to 10.
摘要:
A method for producing a polysilane includes a disproportionation reaction of a methylchlorodisilane mixture to form chlorine-containing oligosilane, a substitution reaction of the chlorine atoms contained in the oligosilane by the reaction with a primary amine and a cross-linking reaction of the oligosilanes using a chain former to form polysilanes. The obtained polysilanes are infusible and are very suitable for being spun to form green fibers and processed to form silicon carbide fibers and fiber composites. The method is characterized in that it can be carried out cost-effectively and quickly and with very high yields.
摘要:
Provided are an organopolysiloxane that exhibits good dispersion stability within not only organic oil agents but also cosmetic materials that contain a powder, and is able to produce a cosmetic material that exhibits excellent skin affinity, an organopolysiloxane that does not impart a sticky feeling, and exhibits excellent skin affinity and skin adhesion, and a cosmetic material including such an organopolysiloxane. The organopolysiloxane is represented by formula (1) below:
in which R 1 represents a hydrocarbon group such as an alkyl group, R 2 represents a group represented by formula (3) or formula (4) below:
in which either R 4 represents a specific hydrocarbon group and R 5 represents a hydrogen atom or a specific hydrocarbon group, or alternatively, at least one of R 4 and R 5 represents a hydroxyalkyl group, and A represents a group containing an organosilyl group or organosiloxane residue.
摘要翻译:提供一种有机聚硅氧烷,不仅在有机油剂中表现出良好的分散稳定性,而且在含有粉末的化妆品材料中表现出良好的分散稳定性,并且能够生产出显示出优异的皮肤亲和性的化妆品材料,不赋予粘稠感的有机聚硅氧烷, 优异的皮肤亲和性和皮肤粘合性,以及包含这种有机聚硅氧烷的化妆品。 有机聚硅氧烷由下式(1)表示:其中R 1表示烃基如烷基,R 2表示由下式(3)或式(4)表示的基团:其中R 4表示 R 5表示氢原子或特定烃基,或者,R 4和R 5中的至少一个表示羟烷基,A表示含有有机甲硅烷基或有机硅氧烷残基的基团。
摘要:
The invention provides a membrane suitable for dewatering acidic mixtures, comprising a bridged organosilica directly applied on a macroporous support in the absence of an intermediate mesoporous or finer layer. The bridged organic silica comprises divalent C 1 -C 9 organic groups A 2 and/or trivalent C 1 -C 9 organic groups A 3 directly bound to the silicon atoms of the organosilica. In particular, the membrane comprises bis-silylmethane or bis-silylethane groups. The membranes effectively separate water from acidic mixtures at high temperatures and without decrease in performance for at least several months.
摘要:
Provided is a curable resin composition capable of forming a cured product that excels in heat resistance, transparency, and flexibility and particularly excels in barrier properties against a corrosive gas (e.g., sulfur oxide). The curable resin composition includes a compound (U) containing an aliphatic carbon-carbon unsaturated bond and a compound (H) containing a hydrosilyl group and includes at least one of a ladder-type silsesquioxane [A1] and a ladder-type silsesquioxane [A2], where the ladder-type silsesquioxane [A1] contains an aliphatic carbon-carbon unsaturated bond and has a number-average molecular weight of 500-1500 and a molecular weight dispersity (Mw/Mn) of 1.00-1.40 as determined by gel permeation chromatography and calibrated with a polystyrene standard, and the ladder-type silsesquioxane [A2] contains a hydrosilyl group and has a number-average molecular weight of 500-1500 and a molecular weight dispersity (Mw/Mn) of 1.00-1.40 as determined by gel permeation chromatography and calibrated with a polystyrene standard.
摘要:
Disclosed are thermally conductive composites that include a polymer matrix functionalized with a carbon-containing species covalently coupled with the polymer matrix. Also disclosed are methods that generally include functionalizing a carbon-containing species and incorporating the functionalized carbon-containing species into the polymer, such that the carbon-containing species are covalently bonded to the polymer matrix via a coupling agent.