9 results about "Pyrocatechols" patented technology

This invention belongs to the field of polymer materials technology and discloses a carbon fiber reinforced polylactic acid composite material and its preparation method. The composite material includes the following raw materials in parts by weight: polylactic acid, PBAT-g-GMA, modified carbon fiber, modified layered double hydroxide, talc, lubricant, and antioxidant. The modified carbon fiber is formed by coating a polydopamine layer on the surface of carbon fiber through the self-polymerization of dopamine, and then grafting catechol, amino-grafted phytic acid, and cage-like polysilsesquioxane onto the surface of the polydopamine layer. The modified layered double hydroxide is formed by intercalating chitosan through electrostatic interaction, and then modifying polyphosphazene with boric acid by grafting ortho-hydroxyl groups on the chitosan chain. This invention uses polylactic acid as the matrix material and adds PBAT-g-GMA blend to improve the brittleness of polylactic acid and enhance the impact strength of the composite material. By combining modified carbon fiber and modified layered double hydroxide, the tensile strength, flexural strength, and rigidity of the composite material are improved, while also endowing the material with excellent heat resistance and flame retardant properties.

The invention belongs to the technical field of preparation of anti-scar products, and particularly relates to an anti-scar compound, preparation of the anti-scar compound, and a microneedle and a microneedle patch containing the anti-scar compound. The anti-scar compound is prepared from the following raw materials: a compound containing catechol and a compound containing an active oxygen sensitive protecting group; the compound containing catechol is selected from one or more of chlorogenic acid, epigallocatechin gallate and quercetin, and the compound containing catechol is selected from one or more of chlorogenic acid, epigallocatechin gallate and quercetin; the compound containing the active oxygen sensitive protecting group is selected from one or more of 3-aminophenylboronic acid, 4-aminophenylboronic acid, 3-formyl phenylboronic acid and 4-formyl phenylboronic acid. The anti-scar compound has a dynamic borate bond and has good responsiveness to a microenvironment of active oxygen at scars, and the anti-scar compound capable of adjusting a focus microenvironment based on a scar endogenous pathogenic mechanism is introduced into a microneedle formula, so that the microneedle has an obvious anti-scar effect; and the administration period can be obviously shortened and the administration frequency can be reduced by virtue of the micro injection.

The application provides an environment-friendly, degradable, antibacterial and tough polylactic acid-based elastic fiber and a preparation method thereof, and relates to the technical field of fiber materials, and comprises the following components in percentage by mass: 55-80wt% of polylactic acid, 13.7-17.5wt% of polyhydroxyalkanoate, 0.5-5wt% of a metal antibacterial agent, 5-20wt% of a thermoplastic polyurethane elastomer, and 0.8-2.5wt% of a star-shaped hyperbranched compatibilizer; the molecular structure of the star-shaped hyperbranched compatibilizer comprises a polylactic acid oligomer segment, a polyethylene glycol segment and a pyrocatechol group; the polylactic acid provides the degradability and basic strength of the matrix; the polyhydroxyalkanoate enhances the toughness, degradability and processability; the metal antibacterial agent endows the fiber with high-efficiency and broad-spectrum antibacterial function; the thermoplastic polyurethane elastomer contributes excellent elasticity and flexibility; and the star-shaped hyperbranched compatibilizer improves the compatibility of the fiber system; and the components synergize under the above-mentioned ratio to lay a multifunctional foundation of the fiber, including the antibacterial function, good elasticity and environment-friendly degradability.

The invention discloses a supramolecular polyurethane elastomer as well as a preparation method and application thereof, and the elastomer is prepared from the following raw materials in parts by weight: 100 parts of polyhydric alcohol, 30-50 parts of diisocyanate, 8-15 parts of a chain extender, 1-5 parts of 3, 3 '-diphenyl-1, 3-pentanediol monoisobutyrate, 1-5 parts of an antioxidant and 1-5 parts of a catalyst. The chain extender is a furan-maleimide derivative containing a Diels-Alder bond, the molecular structure of the furan-maleimide derivative contains two hydroxyl end groups, and the chain extender is a furan-maleimide derivative containing a Diels-Alder bond, the molecular structure of the furan-maleimide derivative contains two hydroxyl end groups, and the molecular structure of the 3, 4-dihydroxybenzaldehyde ethylenediamine is a furan-maleimide derivative containing a Diels-Alder bond. The molecular structure of the 1, 4-dihydroxy benzaldehyde ethylenediamine contains catechol groups and amino groups, the subject-object compound is formed by compounding alpha-cyclodextrin and adamantane methanol according to the molar ratio of 1: 1, and the mechanochromic unit is a diol derivative containing azobenzene side groups.

The invention belongs to the technical field of material synthesis catalysis, and particularly relates to a metallization defect type porous organic framework, a preparation method of the metallization defect type porous organic framework and application of the metallization defect type porous organic framework in carbon dioxide catalytic conversion. According to the invention, 1, 4-dihydroxy benzaldehyde is subjected to a Schiff alkali condensation polymerization reaction to form a structural unit containing a catechol site, and ferric iron is anchored on the catechol site. The metallization defect type porous organic framework obtained in the invention can catalyze the reaction of carbon dioxide and an epoxy compound under normal pressure and solvent-free conditions, the product is simple to separate and purify, the catalyst is easy to recover, and the metallization defect type porous organic framework has good stability and application prospects.

The invention relates to the technical field of high polymer materials, in particular to a preparation method of carbon dioxide-based polyol, which comprises the following steps: by taking 4-allylcatechol as an initiator, reacting epoxypropane and carbon dioxide gas under the action of a catalyst to obtain carbon dioxide-based polyol with a structure as shown in a formula I; in the formula I, x and m are the number of repetitive units of carbonic ester units; y and n are the number of repetitive units of ether units; 3 < = x + m < = 15, 2 < = y + n < = 30. The novel initiator 4-allylcatechol is introduced into the telomerization reaction of propylene oxide and carbon dioxide through a one-pot synthesis method, the double-bond functionalized carbon dioxide-based polyol can be efficiently prepared, the operation is simple and convenient, and the chain length and the structure of the double-bond functionalized carbon dioxide-based polyol are adjustable.

This invention relates to a method for preparing and applying a mussel-inspired water-resistant adhesive gel based on polyacrylic acid and catechol-modified epoxidized vegetable oil, belonging to the field of environmentally friendly polymer adhesive materials. This invention utilizes a dense hydrogen bond network and chain entanglement between catechol-modified epoxidized vegetable oil and polyacrylic acid, combining mussel-inspired adhesion with the hydrophobic properties of oleogels, achieving rapid gelation and high cohesive strength. The resulting adhesive exhibits a dry-state bond strength as high as 24.30 MPa and demonstrates excellent durability in humid environments, reaching a strength of 2.83 MPa after 6 months of water immersion. Furthermore, the adhesive can recover approximately 78% of its adhesive force through a re-curing process, and the underwater bond strength further enhances in subsequent cycles, maintaining effective underwater adhesion for over a year. It also exhibits good resistance to harsh environments such as extreme temperatures and solutions.

A herbal oral composition having the properties for supporting and enhancing musculoskeletal health and processes for manufacturing the same from ingredients are disclosed comprising: a herbal concentrate having a first predetermined percentage (%) by weight, a herbal powder mixture having a second predetermined percentage (%) by weight, a mushroom extract ingredient having a third predetermined percentage (%) by weight, a collagen extract ingredient having a fourth percentage (%) by weight, a solution containing 4-allylpyrocatechol having a fifth percentage (%) by weight, and a plant-derived nanovesicles ingredient having a sixth percentage (%) by weight.

The invention provides an environment-friendly degradable antibacterial tough polylactic acid-based elastic fiber and a preparation method thereof, and relates to the technical field of fiber materials, the environment-friendly degradable antibacterial tough polylactic acid-based elastic fiber comprises the following components by mass: 55-80 wt% of polylactic acid, 13.7-17.5 wt% of polyhydroxyalkanoate, 0.5-5 wt% of a metal antibacterial agent, 5-20 wt% of a thermoplastic polyurethane elastomer, and 0.8-2.5 wt% of a star hyperbranched compatibilizer; the molecular structure of the star-shaped hyperbranched compatilizer comprises a polylactic acid oligomeric chain segment, a polyethylene glycol chain segment and a catechol group; the PLA provides the degradability and basic strength of the matrix; pHA enhances toughness, degradability and processability; the metal antibacterial agent is endowed with an efficient and broad-spectrum antibacterial function; the thermoplastic polyurethane elastomer contributes to excellent elasticity and flexibility, and the star hyperbranched compatilizer improves the compatibility of the fiber system; all the components have a synergistic effect under the proportion, and a multifunctional foundation of an antibacterial function, good elasticity and environment-friendly degradability is laid for the fiber.