A process for preparing polyether-siloxane block copolymers by hydrosilylation of alpha,omega-modified hydrosiloxanes with alpha,omega-modified di(meth)allyl polyethers in the presence of a hydrosilylation catalyst, wherein the reaction is performed in a solvent mixture comprising aromatic solvents, polyethers and alkoxylated alcohol, is described.

The present disclosure belongs to the technical field of flame-retardant polymers, and in particular, to a composite coating and a preparation method and use thereof. The present disclosure provides a composite coating, including n unit coatings arranged in layers, where n1. Each of the unit coatings includes a first coating and a second coating arranged in layers in sequence. The first coating and the second coating both include a water-soluble polymer compound. The water-soluble polymer compound includes an electropositive water-soluble polymer compound or an electronegative water-soluble polymer compound. The water-soluble polymer compounds in the first coating and the second coating have opposite electrical properties. The first coating and/or the second coating further include/includes M(OH)(OCH.sub.3), where the M includes one or more selected from the group consisting of Co, Ni, Fe, Mg, Al, and Zn. The composite coating provided by the present disclosure has excellent flame retardancy.

Embodiments are directed to a pourable foam comprising a first resin component comprising a polymeric methylene diphenyl diisocyanate, a second resin component comprising a polyol, and a barium sulfate powder component. The barium sulfate powder component is combined with the second resin component prior to combining the first and second resin components. The barium sulfate component may comprise between 1% and 50% of the pourable foam. The pourable foam may be used to repair or create aircraft components.

A method of forming an aromatic polyester polyol compound comprising an imide moiety, wherein the method comprises reacting: (i) a cyclic anhydride compound; (ii) a phthalic acid based compound; (iii) a primary amine compound; and (iv) an aliphatic diol compound.

A porous composite material (50) for sound absorption and a method (10) of producing the porous composite material (50) are provided. The method (10) includes preparing (12) a mixture of mechano-electrical conversion elements (56) and electro-thermal conversion elements (58) in an organic solvent. The mixture of the mechano-electrical conversion elements (56) and the electro-thermal conversion elements (58) in the organic solvent is mixed (14) with an aqueous solvent to precipitate a piezoelectric hybrid filler material (54). The piezoelectric hybrid filler material (54) is mixed (16) with a precursor. A foaming operation is performed (18) with the precursor to produce the porous composite material (50).