The present disclosure relates to an ultraviolet absorber, a preparation method therefor, and an ultraviolet screening product containing same and, more specifically, to: an ultraviolet absorber, which comprises polymeric carbon nitrides having a heterocyclic structure comprising C and N; a preparation method therefor; and an ultraviolet screening product containing same.

A coating composition includes: (a) a carboxylic acid functional polyol polymer; (b) a melamine-formaldehyde crosslinker reactive with the carboxylic acid functional polyol polymer; (c) an acid catalyst; and (d) a non-aqueous liquid medium. The carboxylic acid functional polyol polymer has an acid value within a range of from 30 to 120 mg KOH/g and a hydroxyl value within a range of from 60 to 150 mg KOH/g. The melamine-formaldehyde crosslinker includes imino and methylol groups that together make up 35 mole % or less of the total functionality of the melamine-formaldehyde crosslinker, and butyl groups and isobutyl groups that together make up 5 mole % or greater of the total functionality of the melamine-formaldehyde crosslinker. The coating composition cures at a temperature of 100° C. or less.

Compositions and methods related to conducting polymeric compositions that can be used for the storage of electrical energy are generally provided. In some embodiments, the composition comprises redox active polymers comprising an electrophilic nitrogen containing heterocycle and an electron rich aromatic compound. In some embodiments, the composition comprises a triazine-based polymer. The electroactive polymers may be formed, in some cases, by polymerizing an electrophilic nitrogen containing heterocycle-based unit with an electron rich aromatic compound in the presence of heat and an acid-based catalyst. The resulting electroactive polymers may be suitable as polymer films for use as electrodes in energy storage devices. The polymer films disposed as electrodes can improve the energy density of such devices.

An electrochemical oxygen reduction catalyst comprising platinum-containing nanoparticles and at least one member selected from the group consisting of a melamine compound, a thiocyanuric acid compound, and a polymer containing the melamine compound or the thiocyanuric acid compound as a monomer is an electrochemical oxygen reduction catalyst having a high oxygen reduction activity (small overvoltage).

The present invention exploits reactive organophosphorus compounds containing unsaturated vinyl groups, which can be used in a flexible and highly controlled manner to prepare various macromolecular derivatives either via radical reactions or via Michael addition with suitable nucleophiles. Based on the fact that secondary amine groups on the one hand and vinyl groups on the other hand can work as mutual linking sites, an arsenal of novel and useful addition products can be built up. By selecting the number of secondary amine sites and vinyl sites of the participating reaction partners, very different addition products can be formed. In particular, one can form either linear chain type macromolecules (i.e. linear oligomers or polymers) or highly crosslinked network polymers.

A polymer composition comprising a covalent triazine framework having the following structure:

##STR00001##

wherein: each asterisk (*) in A units denotes a point of covalent bonding with an asterisk in B units, and each asterisk (*) in B units denotes a point of covalent bonding with an asterisk in A units; r is an integer of 1-3; R is a fluorinated hydrocarbon containing at least two aromatic rings and at least one ether linkage between aromatic rings; the composition includes a multiplicity of A units and multiplicity of B units; and a portion of the connection points are terminated by endcapping nitrile groups. Also described are methods for producing the polymer and a microporous carbon material produced by pyrolysis of the porous polymer membrane. Also described are methods for using the polymer and microporous carbon material for gas or liquid separation, filtration, or purification.

A well treatment composition for use in a hydrocarbon-bearing reservoir comprising a reversible aminal gel composition. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; and a polar aprotic organic solvent. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon-bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.

This invention is related to a resin matrix composition intended for production of a polymer composite material (PCM) or prepregs for PCM, to variants of methods for producing resin matrix compositions, to a method for curing the resin matrix composition, to a polymer composite material and method for its fabrication. The resin matrix composition includes: (1) polymerizable mixture containing one or more bis-phthalonitrile monomers with the general formula:

##STR00001## where X, Y, Z are each independently selected from the group consisting of H, F, Cl, Br and CH.sub.3, taken in the amount of 20-94 wt % of the polymerizable mixture weight; one or more reactive plasticizers-antipyrenes with the general formula:

##STR00002## where

##STR00003##

group can be in the meta- or para-position relative the oxygen atom bonded to the benzene ring, and R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or plasticizers-antipyrenes with the general formula:

##STR00004## where R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, taken in the amount of 5-80 wt % of the total polymerizable mixture weight; one or more active diluents with the general formula:

##STR00005## where R can be in meta- or para-position relative to the oxygen bonded to the benzene ring, and stands for H, CN, NH.sub.2 or N(C.sub.3H.sub.3).sub.2, in the amount from 1 to 50% of the total polymerizable mixture weight. The resin matrix composition also includes (2) curing agent in the amount from 1 to 20% of the total polymerizable mixture weight selected from aromatic diamines or bisphenols that have boiling points of at least 180° C. under vacuum of 0.1 mm Hg. The total content of the polymerizable mixture and the curing agent is from 60 to 100 wt % of the total resin matrix weight. The invention allows to increase the thermal stability of the resin matrix and obtain composite material which after curing possesses increased thermal stability at temperatures up to 450° C., have melting points or glass transition temperatures of no more than 50° C., provide melt viscosities below 800 mPa.Math.s at temperatures from 100 to 180° C. and below 300 mPa.Math.s at temperatures from 120 to 180° C.

A functional resin material is manufactured by the following reagents including a polyol, a polyamine, a first cross-linking agent, a second cross-linking agent, and a nanocellulose. Each of the first cross-linking agent and the second cross-linking agent includes an isocyanate block. The nanocellulose includes a repeating unit represented by formula (1),

##STR00001##

A bulk moulding compound comprising one or more cyanate ester, a catalyst, a filler and reinforcement fibres is provide, whereby the one or more cyanate ester is independently selected from a difunctional cyanate ester compound and/or a polyfunctional cyanate ester and mixtures of these cyanate esters. Furthermore, the catalyst is independently selected from the group consisting of 4,4′ methylene-bis(2,6-diethylaniline) (M-DEA), 4,4′-methylene-bis(3-chloro-2,6-diethyl¬aniline) (M-CDEA), aluminum(III)acetylacetonate, and mixtures thereof.