Preparation method of high-performance thermotropic liquid crystal polyarylester

Abstract

The invention discloses a preparation method of high-performance thermotropic liquid crystal polyarylester, and relates to a preparation method of thermotropic liquid crystal polyarylester with low dielectric constant and high impact strength, which comprises the following steps of: 1, reacting 2, 5-dihydroxy terephthalic acid with p-hydroxybenzoic acid, 2-hydroxy 6-naphthoic acid, p-hydroxybenzoic acid, p-hydroxybenzoic acid and p-hydroxybenzoic acid; adding acetic anhydride, 4-aminopyridine and an antioxidant into a polymerization kettle, and carrying out melt polycondensation to prepare a prepolymer of the thermotropic liquid crystal polyarylester; 2, performing solid-phase polycondensation reaction on the prepolymer in a rotary kiln under the protection of nitrogen to obtain high-molecular-weight polymer powder; 3, mixing the high-molecular-weight polymer powder with polytetrafluoroethylene resin, cooling and drawing to prepare primary polyarylester; and 4, carrying out heat treatment on the primary polyarylester. The dielectric constant of the thermotropic liquid crystal polyarylester is less than 3.0, the dielectric loss is less than 0.003, the impact strength can reach 35-50kJ / m < 2 >, and the thermotropic liquid crystal polyarylester has high dimensional safety and excellent mechanical properties and processability.

Description

technical field

[0001] The invention relates to a preparation method of high-performance thermotropic liquid crystal polyarylate Background technique

[0002] With the advent of the 5G era, optoelectronics and mobile communications have put forward higher requirements for high-frequency and high-speed transmission. In signal transmission, the transmission rate of the signal is related to the dielectric constant of the substrate (ε r )related. When the dielectric constant of the substrate is in a stable state at high frequencies, it will be conducive to the rapid transmission of signals and reduce delay; at the same time, the smaller the dielectric loss of the substrate, the faster the signal transmission speed inside the substrate. Therefore, the dielectric constant and dielectric loss are the most important parameters to measure the dielectric properties of the substrate. Secondly, other properties of the substrate, such as moisture resistance, heat resistance, and chemic...