A liquid crystal polymer/pet in-situ composite polyester material that can be extruded into a film and its preparation method
A liquid crystal polymer, in-situ composite technology, applied in the field of composite materials, can solve the problems of low dielectric constant, high molding processing temperature, low qualification rate, etc., and achieve the effects of small anisotropy, low processing temperature, and easy control.
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Embodiment 1
[0040] Synthesis of Prepolymer 1:
[0041] First, react p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, hydroquinone and acetic anhydride at a constant temperature of 120-130°C for 1 hour, then rise to 185-195°C within 2 hours, and then react at a constant temperature for 0.5- After 1 hour, the acetylation reaction was completed; then the acetate obtained by the acetylation reaction was melt-condensed with terephthalene dicarboxylic acid, and the polymerization temperature was raised to a predetermined temperature within 3 hours, so that the polymerization reaction continued; The reactant becomes a prepolymer with a certain molecular weight; when the torque of the agitator rises to a predetermined level, nitrogen gas is introduced immediately to terminate the polymerization reaction; the nitrogen pressure is increased to 2kg / cm 2 , release the liquid crystal polymer prepolymer, and measure the melting point and melt viscosity of the obtained liquid crystal polymer prepolyme...
Embodiment 2
[0045]First, react p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, hydroquinone and acetic anhydride at a constant temperature of 120-130°C for 1 hour, then rise to 185-195°C within 2 hours, and then react at a constant temperature for 0.5- After 1 hour, the acetylation reaction was completed; then the acetate obtained by the acetylation reaction was melt-condensed with terephthalene dicarboxylic acid, and the polymerization temperature was raised to a predetermined temperature within 3 hours, so that the polymerization reaction continued; The reactant becomes a prepolymer with a certain molecular weight; when the torque of the agitator rises to a predetermined level, nitrogen gas is introduced immediately to terminate the polymerization reaction; the nitrogen pressure is increased to 2kg / cm 2 , release the liquid crystal polymer prepolymer, and measure the melting point and melt viscosity of the obtained liquid crystal polymer prepolymer. The monomer ratio for preparing th...
Embodiment 3
[0047] Synthesis of Prepolymer 2:
[0048] Prepolymer 2 was prepared in the same manner as Prepolymer 1. The monomer ratio for preparing the above-mentioned liquid crystal polymer prepolymer 2 is as follows: 36 mole % of p-hydroxybenzoic acid, 34 mole % of 6-hydroxy-2-naphthoic acid, 15 mole % of hydroquinone, and 15 mole % of terephthalic acid %. The prepared liquid crystal polymer prepolymer 2 had a melting point of 325° C. and a melt viscosity of 6 Pa·s.
[0049] The obtained prepolymer 2 was heated from 25°C to 105°C in 1 hour, and then kept for 10 minutes; then it was heated from 105°C to 240°C in 1 hour, and kept for 10 minutes. Then, the temperature was raised from 240° C. to 260° C. over 3 hours, and kept at a temperature of 20 hours to carry out solid-state polymerization, and further cooled to obtain LCP4.
[0050] The melting point of LCP4 is 328°C and the melt viscosity is 29Pa·s.
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Abstract
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