A method of manufacturing a semiconductor device, includes forming a sacrificial film made of a polymer having a urea bond on a substrate by supplying an amine and an isocyanate to a surface of the substrate, wherein the sacrificial film is provided in a specific region of the substrate; performing a predetermined process on the substrate on which the sacrificial film is formed; and removing the sacrificial film by heating the substrate to depolymerize the polymer, wherein a carbon bonded to a nitrogen atom contained in an isocyanate group of the isocyanate is a secondary or tertiary non-aromatic carbon.

A method for preparing a novel waterborne polyurethane foam layer for synthetic leather is disclosed. The method includes first preparing a charged cellulose nanofiber by using a wood pulp as a raw material; meanwhile, subjecting a polyisocyanate, a macromolecular diol, a hydrophilic chain extender and a small molecular chain extender to a polyaddition reaction and an acid-base neutralization reaction in sequence, to obtain a cationic or anionic waterborne polyurethane; adding the charged cellulose nanofiber and a certain amount of a crosslinking agent to the oppositely charged ionic waterborne polyurethane emulsion, stirring the resulting mixture, forming a bimolecular layer at the gas/liquid interface by a self-assembly of the cellulose nanofiber and waterborne polyurethane nanoparticles through electrostatic interactions to obtain a stable Pickering foam; using the stable Pickering foam as a template, drying and solidifying to obtain the waterborne polyurethane foam layer for synthetic leather.

Embodiments relate to a crosslinked citrate-based elastomer catheter that is biodegradable and kink resistant. Embodiments of the crosslinked citrate-based elastomer material swells when surrounded by fluid (body fluid) so as to anchor the catheter to tissue but not anchor it so much that movement or removal will cause tissue damage. The catheter can be used as a component to a peripheral nerve block device, for example. Embodiments of the catheter can include embedding biodegradable sensors, moieties, shape memory material, etc. to monitor and modulate functions of the catheter and/or peripheral nerve block.

An embodiment includes a polymer composition comprising a thermoplastic polymer that: (a) is bonded to iodine, (b) includes a vinyl group, and (c) includes urethane linkages. Other embodiments are described herein.

The present invention relates novel furan based amine cross-linkers with improved thermomechanical and water barrier properties. The novelty of this invention is the use of aromatic, and hydrophobic aliphatic aldehydes to bridge two furfuryl amines, which yields a diamine or tetra amines with a significantly enhanced hydrophobic character. These diamine cross-linkers exhibit enhanced water barrier properties and thermomechanical properties when cured with both commercial and synthetic epoxies.

The present disclosure provides compositions which may be used as tissue engineering materials, and more particularly xylitol-doped citrate polymer compositions which may be useful as bone grafts.

The polymerizable composition of the present invention includes at least one isocyanate compound (A) having a cyclic structure, selected from compounds represented by the following Formulae (1), (2), and (3), and aliphatic isocyanate compound (B) having 4 to 11 carbon atoms, and a thiol compound (C).

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A hydroxy functional alkyl polyurea is disclosed having the formula presented in claim 1, wherein R comprises an isocyanurate moiety, biuret moiety, allophonate moiety, glycoluril moiety, benzoguanamine moiety, polyetheramine moiety, and/or polymeric moiety different from a polyetheramine and having an Mn of 500 or greater; wherein each R.sub.1is independently a hydrogen, alkyl having at least 1 carbon, or a hydroxy functional alkyl having 2 or more carbons and at least one R.sub.1 is a hydroxy functional alkyl having 2 or more carbons; and n is 2-6. Further disclosed is a coating comprising: a film-forming resin; and a hydroxy functional alkyl polyurea crosslinker having the formula presented in claim 4, wherein R.sub.1 is a substituted or unsubstituted C.sub.1 to C.sub.36 alkyl group, an aromatic group, an isocyanurate moiety, biuret moiety, allophonate moiety, glycoluril moiety, benzoguanamine moiety, polyetheramine moiety, and/or polymeric moiety different from a polyetheramine having an Mn of 500 or greater, wherein each R.sub.1 is independently a hydrogen, an alkyl having at least 1 carbon, or a hydroxy functional alkyl having 2 or more carbons and at least one R1 is a hydroxy functional alkyl having 2 or more carbons; and n is 2-6, and when R.sub.2 is a substituted or unsubstituted C.sub.1 to C.sub.36 alkyl group the film-forming resin comprises COOH functionality that reacts with the polyurea to form an ester linkage. Other hydroxy functional alkyl polyurea compounds, polymers made with the same, and compositions comprising the same are also disclosed as are substrates coated at least in part with or formed with any of the compositions described herein.

A method for preparing a novel waterborne polyurethane foam layer for synthetic leather is disclosed. The method includes first preparing a charged cellulose nanofiber by using a wood pulp as a raw material; meanwhile, subjecting a polyisocyanate, a macromolecular diol, a hydrophilic chain extender and a small molecular chain extender to a polyaddition reaction and an acid-base neutralization reaction in sequence, to obtain a cationic or anionic waterborne polyurethane; adding the charged cellulose nanofiber and a certain amount of a crosslinking agent to the oppositely charged ionic waterborne polyurethane emulsion, stirring the resulting mixture, forming a bimolecular layer at the gas/liquid interface by a self-assembly of the cellulose nanofiber and waterborne polyurethane nanoparticles through electrostatic interactions to obtain a stable Pickering foam; using the stable Pickering foam as a template, drying and solidifying to obtain the waterborne polyurethane foam layer for synthetic leather.

Degradable polymers, including polyurethane and polyurethane-urea compositions, that can be used in aqueous, non-aqueous and dry hot environments as degradable polymers in oil, gas and other applications.