7 results about "Polymer nanocomposite" patented technology

The application discloses a dielectric breakdown field strength and temperature dependence simulation method and system, and the simulation method comprises the following steps: establishing a criterion for polymer damage caused by molecular chain slip under the action of heat based on a free volume theory; establishing a breakdown criterion for polymer damage caused by molecular chain slip under the joint action of an electric field and a thermal field; quantifying the serpentine movement of a molecular chain under the action of a strong force; establishing an approximate analytical expression of polymer breakdown strength; and fitting the experimental results of sample breakdown field strength change with temperature according to the analytical expression by using a Curve fitting tool of Matlab. The breakdown model established from the perspective of molecular chain displacement can well explain the change relationship between the polymer nanocomposite dielectric breakdown field strength and temperature, and provides theoretical guidance for the preparation of high-temperature dielectric materials.

The present application relates to the field of material analysis, in particular to a kind of quantitative analysis method of bridging chain mechanics contribution in polymer nanocomposite material.The quantitative analysis method provided by the present application realizes the quantitative analysis of bridging chain mechanics contribution by artificially constructing the model of bridging chain structure, in combination with the accurate tracking of known particle number and local stress decomposition technology, establishes the quantitative relationship between "bridging chain structure-mechanics contribution", provides analysis tool and theoretical basis for rational design of high-performance nanocomposite material.

The application discloses an azobenzene polymer nanocomposite and application thereof, wherein the azobenzene polymer nanocomposite is composed of two parts: an azobenzene small molecule matrix or an azobenzene polymer matrix and nano-silica particles with surface grafted azobenzene polymer. Azobenzene groups can reversibly undergo cis-trans isomerization under the irradiation of ultraviolet light and visible light; the composite material exhibits a solid state in the trans state, and due to the presence of nano-particles, the cohesive energy is improved, so that the composite material has strong adhesion and can bear a large load; the composite material exhibits a liquid state in the cis state, and the adhesion is greatly reduced, that is, photoisomerization can cause load reduction. The introduction of SiO2@PAzo solves the problems of insufficient bonding strength, low reversible efficiency and the like of conventional reversible adhesives.

This invention discloses a method for preparing a core-shell porous polymer / aromatic heterocyclic polymer nanocomposite solvent-resistant nanofiltration membrane. First, porous polymer nanoparticles are composited with an amino polymer to synthesize core-shell porous polymer nanoparticles. Then, these nanoparticles are chemically crosslinked with the prepared aromatic heterocyclic polymer nanomaterials and a crosslinking agent to form a nanocomposite dispersion. Finally, the nanocomposite dispersion is directly coated onto the surface of a nonwoven fabric and then heat-treated to form a membrane. This invention is simple, controllable, and easy to scale up. The prepared membrane maintains high permeability selectivity and solvent resistance stability during long-term service, showing good prospects for industrial production and application.

The invention relates to a graphene oxide-reinforced polyamide 6 / high-density polyethylene blend (PA6 / HDPE) nanocomposite and a preparation method thereof. With the invention, a graphene oxide-reinforced polyamide 6 / high-density polyethylene blend nanocomposite with maximized levels of homogeneity level is introduced. In the invention, the problem of agglomeration, which cannot be prevented in direct melt mixing used in the production of graphene oxide-reinforced polyamide 6 / high-density polyethylene blend (PA6 / HDPE) nanocomposite, was prevented by adding an additional solvent mixing step, thus eliminating the agglomeration problem and increasing the rate of graphene oxide in the nanocomposite material. In the invention, all the problems encountered in incorporating GO (graphene oxide) content into polymer nanocomposites containing polyamide 6 (PA6) and high-density polyethylene (HOPE) are eliminated and a nanocomposite is introduced in which the enhancing properties of GO are effectively transferred to the nanocomposite structure. In addition, the invention eliminates the limitations of the polyamide 6 / high-density polyethylene (PA6 / HDPE) blend nanocomposite, such as unstable phase morphologies and low interface strength.

A biosustainable wood-based microfluidic cassette having an impedimetric nitrate sensor for nitrate monitoring of water samples, wherein the nitrate sensor employs a nanocomposite having nitrate-binding metal ion complexes incorporated in and / or on polyaniline / carbon nanostructure. The nitrate sensor demonstrates good specificity to nitrate, reproducibility, a wide temperature range operability, and measurement equivalency to commercial nitrate sensors.