6 results about "Polyethylene naphthalate" patented technology

An optically anisotropic polymer thin film includes a crystallizable polymer and an additive configured to interact with the polymer (e.g., via π-π interactions) to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 50% of the molecular weight of the crystallizable polymer. Example crystallizable polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, polybutylene terephthalate, as well as derivatives thereof. Example additives, which may occupy up to approximately 10 wt. % of the polymer thin film, include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons, for example. The optically anisotropic polymer thin film may be characterized by a refractive index greater than approximately 1.7 and an in-plane birefringence greater than approximately 0.2.

The present application relates to the technical field of polyester material modification, and particularly relates to a high-transparency polyethylene naphthalate material, a preparation method and application, aiming at the problems of fast crystallization rate of the PEN material in the process of processing and molding, easy crystallization of thick products, light transmittance reduction caused by the crystallization, and insufficient material toughness, the present application introduces a diol monomer containing a side group and a flexible chain segment diol monomer into the PEN melt polycondensation process for copolymerization, wherein the diol containing a side group introduces a steric hindrance structure in the molecular chain to destroy the regular packing of the PEN molecular chain, thereby inhibiting the material crystallization behavior and improving the light transmittance of the thick product; the flexible diol introduces a flexible chain segment in the molecular chain to increase the free volume of the molecular chain and improve the molecular chain movement ability, thereby improving the material toughness. Through the above-mentioned synergistic copolymerization modification method, the crystallization tendency of the PEN material can be effectively reduced, the obtained PEN thick product has excellent light transmittance and toughness at the same time, and is suitable for the preparation of high-performance transparent polyester products.

The application discloses a kind of optical adhesive protective group film, comprising: core layer, it is arranged between first surface layer and second surface layer;Core layer includes first polyester;First surface layer and second surface layer include the mass ratio of (45~50) and functional master batch of (50~55) first polyester, and functional master batch includes polyethylene naphthalate, second polyester and modified barium sulfate.By mixing the dispersibility of functional master batch and first polyester is improved, and then the haze and light transmittance of base film are optimized;By polyethylene naphthalate preparation functional master batch, the heat resistance and stability of base film are optimized, and its transmittance is improved and haze is reduced.

The application discloses a perovskite ink suitable for meniscus coating, a preparation method and application thereof, the perovskite ink comprises a perovskite material, a polymer additive and a solvent; the polymer additive is selected from one or more of polymethyl methacrylate, polydimethylsiloxane, polyethylene naphthalate, polyethylene terephthalate, polyimide, polycarbonate, polyurethane, natural rubber or silicone polymer. The application adopts a polymer additive to regulate the shape of perovskite precursor micelles in a solution, and prepares perovskite precursor ink. The ink shows uniform film morphology and single crystal orientation after blade coating. The high-quality perovskite film prepared by using the perovskite ink improves the performance of a perovskite battery.

The present application provides a polyethylene naphthalate resin composition which can be used for optical members such as optical films. The polyethylene naphthalate resin composition for optical members of the present application contains (A) polyethylene naphthalate and (B) a phosphorus compound or a salt thereof represented by the following formula (I) or (II) (in the formula, R1 represents an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a benzyl group, R2 and R3 represent an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a benzyl group, a glycol group, or a hydrogen atom, and R1 and R2 can be bonded to form a ring).