Abstract: A carbonate-containing epoxy resin and a manufacturing method for a carbonate-containing epoxy resin, an epoxy curable product and a method for degrading an epoxy curable product are provided. The carbonate-containing epoxy resin includes a structure represented by formula (I) or formula (II). Formula (I) and formula (II) are defined as in the specification.

Abstract: A diamine monomer compound with a structural formula of wherein n1 is an integer greater than 1, forms the basis of a dielectric material with reduced dielectric losses for improved signals transmission. A method for preparing the compound, a polyimide resin made from the compound, a flexible film, and an electronic device including the polyimide resin are also disclosed. The compound has a long but flexible even numbered carbon chain and a liquid crystal unit structure. The reduced regularity and rigidity of the molecular chain make the polyimide resin convenient for film-forming. Dimensional stability is improved, the coefficient of thermal expansion of the materials is reduced, and the materials have good mechanical and thermal properties, the electron loss factor and coefficient of thermal expansion of the materials being reduced.

Abstract: A diamine monomer compound with reduced dielectric losses for better integrity and stability in digital transmissions is represented by a structural formula of wherein n1 is an integer greater than 1. A method for preparing the diamine monomer compound and a polyimide resin developed therefrom are disclosed. The diamine monomer compound introduces a long even numbered carbon chain and a liquid crystal unit structure, the long even numbered carbon chain giving flexibility, which reduces the regularity and rigidity of the molecular chain and facilitates film-forming processing. Dimensional stability is improved, and the coefficient of thermal expansion of the materials is reduced, the materials have good mechanical and heat-tolerant thermal properties, the loss factor and the coefficient of thermal expansion of the materials being reduced. A flexible film of the resin and an electronic device are also disclosed.

Abstract: A portable laser engraving/cutting apparatus includes a casing, a working laser source, a lens unit, a first axis galvanometric unit and a second axis galvanometric unit. The working laser source, the lens unit, the first axis galvanometric unit and the second axis galvanometric unit all are installed within the casing to implement the portable laser engraving cutting apparatus with a small volume.

Abstract: The invention discloses a portable laser engraving/cutting apparatus including a casing, a working laser source, a lens unit, a first axis galvanometric unit and a second axis galvanometric unit. The working laser source, the lens unit, the first axis galvanometric unit and the second axis galvanometric unit all are installed within the casing to implement the portable laser engraving cutting apparatus with a small volume.