Abstract: Embodiments relate to a polyamide-imide film that has a clean appearance and transparency and is excellent in antiblocking properties, a process for preparing the same, and a display front panel and a display device comprising the same. The polyamide-imide film comprises a polyamide-imide polymer formed by polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound; and a filler, wherein the dicarbonyl compound comprises a first dicarbonyl compound and a second dicarbonyl compound, the first dicarbonyl compound and the second dicarbonyl compound are structural isomers to each other, and the FH value of Equation 1 is 0.5 or less.

Abstract: The present invention relates to a composition of polymers comprising dynamic covalent diketoenamine bonds. This composition allows the formulation of polymeric materials with a wide range of architectures and properties, and further allows these materials to be recycled using thermal, chemical, or mechanical processes.

Abstract: Aspects of the present disclosure provide fluoropolymers and methods for forming and using such fluoropolymers. Fluoropolymers include polyfluorobenzoxazines and polyfluoroimides. Methods for forming polyphthalonitriles are also provided. The present disclosure is further directed to compositions containing one or more fluoropolymers and one or more metal oxides.

Abstract: The present invention provides a polyimide film, which comprises a polyimide having a structure represented by formula (I): in which A is a residue group of an aromatic diamine containing a sulfonyl group in its main chain moiety, R1 is a residue group of an aromatic dianhydride, R2 is a residue group of an aliphatic dianhydride, m and n are each independently a positive integer, a diamine monomer constituting the polyimide is only composed of the aromatic diamine containing the sulfonyl group in its main chain moiety, and the polyimide is surface-dried at 75° C. to 155° C. in the process of forming the polyimide film. The polyimide film of the present invention has transparency and UV absorption properties.

Abstract: In various embodiments, the present invention is directed to a PPF-based copolymer for 3D printing applications and methods for its making and use. These copolymers have a viscosity in a printable viscosity range and allow light transmittance at curing wavelengths. In various embodiments, a lower viscosity copolymers are obtained by substitution of a portion of maleic anhydride with succinic anhydride and then forming a poly(propylene fumarate-co-succinate) copolymer by the copolymerization of maleic anhydride and succinic anhydride with propylene oxide via Mg(BHT)2(THF)2 catalyzed ring opening copolymerization (ROCOP). Because of their lower viscosities, these copolymers require less, if any, diethyl fumarate (DEF) to prepare the 3D printing resin, while the mechanical properties can still be adjusted as with a PPF polymer prepared without the succinic anhydride.

Abstract: A packaging film and a preparation method thereof, and a filter chip packaging method are provided. The raw materials of the packaging film include: 20-24 parts by mass of silicon dioxide, 24-26 parts by mass of aliphatic polyurethane acrylate, 12-15 parts by mass of phenoxy resin, 5-13 parts by mass of flexible liquid epoxy resin, 10 parts by mass of bisphenol F epoxy resin, 17-19 parts by mass of curing agent, 2-5 parts by mass of photoinitiator, and 0.4-0.8 parts by mass of accelerant, where the curing agent is compounded by bisphenol F-based benzoxazine curing agent and dicyandiamide curing agent according to the mass ratio of 10:(7-9). The packaging film has excellent flexibility and adhesion, a low moisture absorption rate, and high heat resistance and is especially suitable for the packaging of filter chips.

Abstract: A method for setting conditions for use of a polymerization catalyst includes a step of acquiring a physical property value derived from remaining functional groups after maintaining a temperature of a composition including a polymerization-reactive compound and a predetermined amount of a polymerization catalyst, a step of calculating a remaining functional group ratio from the physical property value, a step of calculating a reaction rate constant based on a reaction rate equation from the remaining functional group ratio, a step of calculating an activation energy and a frequency factor from the reaction rate constant using an Arrhenius plot, a step of determining whether or not the activation energy satisfies a predetermined condition for the polymerization catalyst, an step of setting an approximation equation from the frequency factor, and a step of setting an addition range with respect to the polymerization-reactive compound.

Abstract: The present invention relates to novel degradable branched-block copolymers, comprising a star-shaped copolymer central core or a linear copolymer central core, functionalized with photoreactive groups chosen among aryl-azide, (meth)acrylate or thiol groups. The present invention also relates to the use of these degradable branched-block copolymers as photo-crosslinkers to provide degradable photo-crosslinked elastomers as biomaterials suitable for medical and tissue engineering applications. A method for preparing a degradable photo-crosslinked polymer, preferably a degradable photo-crosslinked elastomer, starting from the branched-block copolymer of the invention via a shaping process and an irradiation step is also provided.

Abstract: A composite material includes biodegradable and/or renewable materials such as purified milk protein recovered as a byproduct in cheese making processes. The result is a material suitable for three-dimensional (3D) printing and extrusion based polymer processing, with improved properties but that is still environmentally friendly. Purified milk protein may be used to produce composite thermoplastic materials or resins. Additional chemical modification may improve the blending of purified milk protein.

Abstract: The purpose of the present invention is to provide: a resin material that has a novel structure and can be suitably used in a printed wiring board: and a resin composition that contains this resin material and has a cured product thereof having a low dielectric loss tangent and excellent adhesion, heat resistance, and mechanical characteristics. The present invention provides: a polyamic acid resin that is a reaction product of an amino phenol compound (a), an aliphatic diamino compound (b), a tetrabasic acid dianhydride (c), and an aromatic diamino compound (d), said polyamic acid resin having an amino group at both ends thereof: a polyimide resin being an imidization compound of the polyamic acid resin: a resin composition containing the polyimide resin: and a cured product thereof.

Abstract: The present disclosure relates to a method for the production of polyamides having the benefit of simpler process control, lower thermal degradation and greater compositional flexibility. More particularly, it relates to processes of converting salts of diamines and dicarboxylic acids to polyamides in the solid state without a melt phase, by fluidizing solid diacid in a fluidizing gas.

Abstract: A method for producing a poly(3-hydroxybutyrate) resin-containing composition for melt processing includes: heating a material containing a poly(3-hydroxybutyrate) resin to a temperature equal to or higher than a melting point peak temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin and equal to or lower than a melting point peak end temperature in the differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin, wherein the difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is 10° C. or more; and extruding the heated material to obtain a composition for melt processing that has a new crystallization peak at a temperature higher than the melting point peak temperature.

Abstract: The invention discloses a flame-retardant semi-aromatic polyamide derived from the following monomers: a diacid monomer A: where A1 is terephthalic acid or terephthalic acid and other diacid, terephthalic acid accounts for 50 to 100 mol % of A1, and A2 is [(6-oxido-6H-dibenzo-(c,e)(1,2)-oxaphosphorin-6-ketone)-methyl]-butanedioic acid, A1+A2=100 mol %, A1=90 to 99 mol %, A2=1 to 10 mol %; and diamine monomer B: one or more of diamine monomers containing 4 to 36 carbon atoms. In the present invention, by an in situ polymerization, a specific flame-retardant monomer [(6-oxido-6H-dibenzo-(c,e)(1,2)-oxaphosphorin-6-ketone)-methyl]-butanedioic acid is copolymerized in a semi-aromatic polyamide chain segment, excellent mechanical properties and low water absorption can be obtained.

Abstract: The present invention relates to self-supported elastomeric film made from a composition comprising polymer latex particles bearing ethylenically unsaturated groups pending from the polymeric backbone of the latex particles wherein the ethylenic unsaturation is separated from the polymeric backbone by at least 3 chemical bonds, to an article comprising the self-supported elastomeric film and to a method for making a self-supported elastomeric film from a composition comprising said polymer latex particles.

Abstract: Debondable adhesive compositions are provided. This disclosure also provides articles of footwear and components for articles of footwear including a debondable adhesive matrix. The debondable adhesive matrix can allow for the bonding and debonding of two substrates in the article of footwear or component thereof. This disclosure also provides methods of making the debondable adhesive compositions and methods of using said compositions for bonding and debonding the substrates, e.g. for bonding and debonding of an upper and an outsole in an article of footwear.

Abstract: Disclosed is a polyamic acid having Formula I In Formula I: Ra represents one or more different tetracarboxylic acid component residues; Rb represents one or more different aromatic diamine residues or aromatic diisocyanate residues; and 5-100 mol % of Rb has Formula II In Formula II: R1 through R6 are the same or different and are haloalkyl or haloalkoxy; R7 is the same or different at each occurrence and is deuterium, halogen, cyano, hydroxyl, alkyl, deuterated alkyl, heteroalkyl, alkoxy, heteroalkoxy, haloalkyl, haloalkoxy, silyl, siloxy, hydrocarbon aryl, substituted hydrocarbon aryl, heteroaryl, substituted heteroaryl, vinyl, or allyl; n is an integer from 0-10; x1 and x4 are the same or different and are an integer from 0-3; x2 and x3 are the same or different and are an integer from 0-2; and * indicates a point of attachment.

Abstract: A bisphenol composition including 95% or more by mass of a bisphenol, wherein a bisphenol represented by the following general formula (II) in the bisphenol composition constitutes 150 mass ppm or more, and the bisphenol composition has a methanol dissolution color (Hazen color number) of 2 or less, In formula (II), X denotes a single bond, —CR11R12—, —O—, —CO—, —S—, —SO—, or —SO2—, R11 and R12 independently denote a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and R11 and R12 may be bonded to each other to form a ring. A method for producing a polycarbonate resin using the bisphenol composition is also described.

Abstract: There are provided herein, inter alia, complexes, compositions and methods for the delivery of nucleic acid into a cell in vivo. The complexes, compositions and methods may facilitate complexation, protection, delivery and release of oligonucleotides and polyanionic cargos into target cells, tissues, and organs both in vitro and in vivo.

Abstract: An in-situ hydrophobically modified aramid nano aerogel fiber as well as a preparation method and uses thereof are provided. The preparation method includes: providing an aramid nano spinning solution; preparing a hydrophobically modified aramid nano aerogel fiber by using a spinning technology, wherein the coagulating bath adopted by the spinning technology includes a first organic solvent and a halogenated reagent including a monochloroalkane, a monochloroalkane, a dibromoalkane, a dichloroalkane and a trichloroalkane; and then drying to obtain the in-situ hydrophobically modified aramid nano aerogel fiber. The in-situ hydrophobically modified aramid nano aerogel fiber has a unique three-dimensional porous network structure, low heat conductivity, high porosity, high tensile strength and elongation at break, a certain spinnability and structure stability, and can be applied to the field of textiles. A fabric knitted with the hydrophobic fibers has a self-cleaning ability.

Abstract: A flexible polyamide including a unit formed from an aliphatic dicarboxylic acid (A1) having 18 or more carbon atoms and/or a unit formed from an aliphatic diamine (B1) having 18 or more carbon atoms, wherein the polyamide has a total content of 10 to 90% by mass of the unit formed from (A1) and the unit formed from (B1) and has a melting point of 240° C. or higher.