Abstract: The present application discloses a low-viscosity silane-terminated resin for a sealant and a preparation method thereof, and belongs to the technical field of sealants. The present application firstly uses an alcohol initiator, an alkali earth metal and epoxy alkane to synthesize a low-molecular-weight polymer, then adds a polymetallic cyanide catalyst and the epoxy alkane to synthesize a high-molecular-weight polymer, and finally adds carboxylate metal and isocyanate silane to react to obtain the silane-terminated resin. A short chain segment is successfully introduced into a molecule, and an original molecular crystal is destroyed, to achieve intramolecular plasticization, so that its molecular chain becomes flexible and is easy to move, thus the purpose of reducing viscosity is achieved.

Abstract: A method of completely dissolving lignocellulosic biomass. The method includes the steps of dissolving a sample of biomass in an aqueous solution of strong acid and an amine-thiol to yield a first solution. A method for measuring lignin concentration in biomass via absorbance of the first solution at a wavelength of about 283 nm by comparing the measured absorbance to a standard curve of absorbance values made from solutions of known lignin concentration.

Abstract: The present disclosure relates to an epoxy resin of which distribution of molecular weight having distribution range of molecular weight of 300 to 2,000,000 is adjusted such that an upper limit value is increased to a maximum of 2,000,000, a method of preparing the same, a composition comprising the same, and a use thereof. The epoxy resin having controlled distribution of molecular weight of the present disclosure may have improved thermal properties of an epoxy system by expanding the distribution of molecular weight, and may exhibit excellent processability.

Abstract: An epoxy resin composition includes the following components: [A] epoxy resin, [B] aromatic diamine, and [C] a compound having a boiling point of 130° C. or more, a molecular weight m of 50 to 250 no epoxy group in the molecule and substantially no ability to cure an epoxy resin. The composition also satisfies the following conditions: (1) the ratio H/E between moles E of epoxy groups in [A] and moles H of active hydrogen in [B] is 0.50 to 1.30; (2) at least a part of component [C] satisfies a ratio m/M in a range of 0.10 to 0.60 of the molecular weight m thereof to a theoretical molecular weight between crosslinking points, M, of a cured product of the epoxy resin composition; (3) the ratio C/E of moles E of epoxy groups of [A] to moles C of [C] satisfying condition (2) is 0.01 to 0.20.

Abstract: This document relates to sealant compositions containing a sliding-ring polymer (polyrotaxane) additive and a polymeric matrix material. The sealant materials exhibit enhanced mechanical properties as compared to the same sealant composition that does not contain the additive. This document also relates to 3D-printed sealant compositions containing a sliding-ring polymer (polyrotaxane) additive and a polymeric matrix material.

Abstract: A method for preparing a lignin adhesive and a product thereof are provided. The method includes: treating a wood fiber raw material with a mixed solution; after the treatment, adding an organic solvent to perform a solid-liquid separation while stirring, subjecting an obtained liquid to a rotary evaporation to remove the organic solvent, and washing and drying the product to obtain the lignin adhesive. The method can remove a large amount of lignin from wood fiber raw materials at a low temperature, and in the process of lignin removal, the lignin adhesive is formed by the cross-linking reaction with the solvent in the system, realizing the separation of lignin and the formation of lignin adhesive simultaneously. And the method is simple, has low cost and high yield, and can realize the large-scale preparation of lignin adhesive and the efficient removal of lignin.

Abstract: A composition, process, and device are disclosed. The composition includes a polymer formed by reacting an epoxy compound with an amine curing agent. The epoxy compound comprises a Diels-Alder dimer and an ester moiety. The process includes providing a polymer formed by reacting the epoxy compound with the amine curing agent. The device includes a material that includes the polymer.

Abstract: The present invention relates to an epoxy resin system having a phase separation structure, a preparation method therefor and an application thereof. After mixing an epoxy resin, an amine curing agent and an epoxy diluent, pre-polymerization is carried out to obtain a prepolymer 1; or, after mixing an epoxy resin and an amine curing agent, pre-polymerization is carried out to obtain a prepolymer 1; after mixing an epoxy resin, an anhydride curing agent and an accelerator, polymerization is carried out to obtain a prepolymer 2; and after the prepolymer 1 and the prepolymer 2 are mixed, curing is carried out to obtain an epoxy resin system having a phase separation structure. The present invention controls the formation of a thermosetting epoxy resin system having a phase separation structure by means of preparing different epoxy resin pre-polymerization systems and using an interface reaction between the different pre-polymerization systems.

Abstract: A polymeric composition may include a thermoplastic polymer including: at least one monomer selected from the group consisting of vinyl esters, C2-C12 olefins, and combinations thereof; and a dynamic crosslinking group; and a dynamic crosslinking system to dynamically crosslink the thermoplastic polymer.

Abstract: The present disclosure provides a polymerizable composition. The polymerizable composition includes a phthalonitrile resin, a curative, and a polyoxometalate of Formula I: Hn[XM12O40] (I). In Formula (I), M is W or Mo, n is 1 to 6, and X is a heteroatom selected from P, Si, S, Ge, As, Te, or Se. The present disclosure also provides an article. The article includes a polymerization product of the polymerizable composition. Additionally, a method is provided. The method includes mixing a polyoxometalate of Formula I with at least one of a curative or phthalonitrile resin and mixing at least a portion of the curative with at least a portion of the phthalonitrile, thereby forming a polymerizable composition. The method further comprises subjecting the polymerizable composition to a temperature of 180° C. to 250° C., to form an at least partially polymerized article and subjecting the at least partially polymerized article to a temperature of 300° C. to 350° C. to complete polymerization of the article.

Abstract: Disclosed herein is a liquid salt activator comprising a salt, a suspending aid, and water, wherein the salt is present in the liquid salt activator in an amount of from about 5 wt. % to about 95 wt. %, based on the total weight of the liquid salt activator. Also disclosed herein is an activated extended life slurry (ELS) composition comprising a hydraulic cement, a supplementary cementitious material, the liquid salt activator, and an aqueous fluid. The activated ELS composition can be used in a method of servicing a wellbore penetrating a subterranean formation.

Abstract: The present invention provides an epoxy resin composition capable of exhibiting high moisture resistance and reducing reduction in adhesion at high temperature and high humidity. Provided is an epoxy resin composition containing: a modified polyvinyl acetal resin containing a hydrogen-bonding group-containing constitutional unit; and an epoxy resin, the modified polyvinyl acetal resin having an equilibrium moisture absorption of 5 to 20% by weight as measured with an infrared moisture meter after standing at 40° C. and 90% RH for seven days.

Abstract: A shape-memory polymer that is melt-recyclable with high processability and little performance loss, in contrast to known Crosslinked semicrystalline shape-memory networks that are capable of storing large amounts of elastic energy with negligible plastic deformation but as thermosets are not easily melt-processed or recycled. In examples herein, catalyst-free isocyanate chemistry is used to prepare two linear poly(caprolactone)s with bisurea hydrogen bonding groups periodically positioned along the main chain. Compared to an entangled poly(caprolactone) homopolymer of similar molecular weight, the segmented poly(bisurea)s exhibit minimal stress relaxation when elastically strained at identical conditions. Furthermore, the materials' single relaxation times indicate chain reptation, and at sufficient temperatures, disentanglement occurs rapidly enough to perform melt-processing.

Abstract: Disclosed herein is a photo-polymerizable coating with broad-spectrum antimicrobial properties designed for personal protective equipment (PPE), such as face masks.

Abstract: Embodiments of the present disclosure generally relate to epoxy resin compositions and coating systems used to form epoxy resin compositions. In an embodiment, an epoxy resin composition is provided. The resin composition includes an epoxy resin; a curing agent; and an acetoacetoxy-functionalized polymer.

Abstract: An organic-inorganic hybrid material is disclosed comprising a metal compound and a lignin fraction, as well as processes for preparing the same and uses as an antimicrobial agent in agriculture, and in human and animal food industry.

Abstract: This document relates to shape memory compositions containing a sliding-ring polymer (polyrotaxane) additive and a thermally-curable epoxy resin. The shape memory compositions are able to deform and reform in response to external stimuli. This document also relates to 3D-printed shape memory compositions containing a sliding-ring polymer (polyrotaxane) additive and a thermally-curable epoxy resin.

Abstract: Provided is a sheet molding compound which can inhibit the formation of burrs during press molding, enables a matrix resin to exhibit excellent fluidity and excellent quick curing properties during press molding, and makes it possible to obtain a fiber-reinforced composite excellent in mold release properties, mechanical characteristics, and heat resistance. The sheet molding compound of the present invention contains an epoxy resin composition and reinforcing fiber, in which a gel time of the epoxy resin composition is 30 to 140 seconds at 140° C., a temperature at the start of curing reaction of the epoxy resin composition is 70° C. to 115° C., and when b1 represents a viscosity of the epoxy resin composition measured at 30° C. 7 days after the preparation of the composition, and b2 represents a viscosity of the epoxy resin composition measured at 30° C. 14 days after the preparation of the composition, b1 and b2 satisfy b2/b1?5.

Abstract: The disclosure relates to epoxy-based compositions comprising a decarboxylated rosin acid (DCR) component, suitable as an efficient plasticizer. It further improves hardness, elasticity, UV exposure viability properties of the paint and coating compositions. The DCR increases the bio-based renewable material content of a coating formulation and provide solutions for phthalate-free products. The DCR has a density of 0.9 to 1.0 g/cm3, a flash point of 135 to 175° C., an acid value of <50 mg KOH/g, measured according to ASTM D465, and a viscosity of 15 to 60 cSt at 40° C., measured according to ASTM D-445.

Abstract: A two-stage epoxy bonding oil includes a main agent A and a curing agent B in a weight ratio of 1:1 to 3:1. The curing agent B includes 70 to 90 parts of a linear bifunctional secondary amine curing agent, 10 to 30 parts of a high-melting-point latent curing agent and 1 to 5 parts of an anti-settling agent. A two-stage curing of epoxy bonding oil includes a first-stage curing at room temperature whereby the cured product is in a thermoplastic state and a second-stage curing at 100° C. to 180° C. whereby the cured product is in a thermosetting state. It solves the contradiction between sticking wheels and bonding performance of the bonding layer in field of road and bridge pavement, exploring a new direction for the waterproof bonding layer materials in road and bridge pavement such as steel bridge deck pavement, concrete bridge deck pavement and tunnel pavement.