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Liquid crystal high molecular material and its preparing method

A liquid crystal polymer, mole fraction technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of difficult control of the end point of polymerization reaction, narrow processing temperature range, high polymerization temperature, etc., and achieve wide processing temperature range and easy preparation , the effect of low melting point

Inactive Publication Date: 2004-04-28
SHANGHAI PRET COMPOSITES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, LCP also has disadvantages: high melting point, narrow processing temperature range; high polymerization temperature, difficult to control the end point (molecular weight) of the polymerization reaction

Method used

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  • Liquid crystal high molecular material and its preparing method
  • Liquid crystal high molecular material and its preparing method
  • Liquid crystal high molecular material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-19

[0017] LCP preparation

[0018] The polycondensation reaction is carried out in a stainless steel reactor. The reactor is heated by electric heating, and the temperature is accurately controlled by the control unit. After the agitator is decelerated by the gear reducer, it is controlled by the speed controller. During the reaction, the speed and torque can be read continuously from the speed controller. Torque indicates melt viscosity, that is, the size of molecular weight. The reaction kettle is connected with a toothed separator, a water condenser, and a collector. N 2 The gas is connected to the reactor through the needle valve, N 2 Air flow is controlled by a needle valve. The vacuum system is connected to the reactor through a needle valve, and the speed of vacuuming is controlled by the needle valve. In pass N 2 Under the condition of gas, put the reactant into the reactor, and add a certain amount of catalyst. Turn on the stirrer at a speed of 150 rpm. The tem...

Embodiment

[0024] Example HBA HQ MA DODA TA M+D / T (mA) (°C) (°C)

[0025] 1 54 23 15 0 8 65 / 35 0.61 321.2 325-328

[0026] 2 54 23 13.8 0 9.2 60 / 40 0.59 329.5 329-333

[0027] 3 54 23 12.4 0 10.6 54 / 46 0.61 336.4(2) 340-345

[0028] 4 54 23 12.5 2.5 8 65 / 35 0.60 315.8 321-325

[0029] 5 54 23 10 5 8 65 / 35 0.61 319.4(2) 319-329

[0030] 6 54 23 7.5 7.5 8 65 / 35 0.66 334.6(2) 334-339

[0031] 7 54 23 11.3 2.5 9.2 60 / 40 0.62 326.5 328-338

[0032] 8 54 23 8.8 5 9.2 60 / 40 0.61 331.3(2) 333-341

[0033] 9 57 21.5 12.9 0 8.6 60 / 40 0.62 332.6 337-342

[0034] 10 57 21.5 12.0 3 6.5 70 / 30 0.62 313.9 316-321

[0035]11 57 21.5 10.0 5 6.5 70 / 30 0.62 314.3(2) 318-326

[0036] 12 57 21.5 10.4 2.5 8.6 60 / 40 0.66 328.6(2) 332-340

[0037] 13 57 21.5 9.9 3 8.6 60 / 40 0.61 326(2) 331-342

[0038] 14 57 21.5 7.9 5 8.6 60 / 40 0.62 339.1(2) 338-348

[0039] 15 60 20 12 0 8 60 / 40 0.63 331.2(2) 338-344

[0040] 16 60 20 9 5 6 70 / 30 0.63 324.8 324-332

[0041] 17 60 20...

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Abstract

The liquid crystal polymer (LCP) material contains in its chain structure repeated units introducing by p-hydroxybenzoic acid, hydroquinol, mixed aromatic acid, terephthalic acid and 4, 4'-diphenyl diformic acid. Adding small amount of 4, 4'-diphenyl diformic acid in certain range can lower the smelting point of LCP to expand its processing temperature window; lower the rate and melt viscosity of its late sage polymerization for easy control; and raise its toughness. In some composition range, the processing temperature window has its width increased with the increasing molar content of p-hydroxybenzoic acid and terephthalic acid.

Description

technical field [0001] The invention relates to a new liquid crystal polymer (LCP) material and a preparation method thereof. Its chain structure contains p-hydroxybenzoic acid (HBA), hydroquinone (HQ), mixed aromatic diacids (MA, isophthalic acid (IA), 2,6-naphthalene dioic acid ( NDA), a mixture of 4,4'-dicarboxy-N-phenylbenzamide (NA), terephthalic acid (TA) and 4,4'-diphenyl ether dicarboxylic acid (DODA) unit. Background technique [0002] LCP is a high-performance polymer material with excellent comprehensive properties: excellent fluidity, high dimensional precision, good dimensional stability, low linear expansion coefficient, high rigidity, high strength, and high toughness. Ceramic-like chemical resistance, excellent air tightness, high heat distortion temperature, low moisture absorption, inherent flame retardancy, excellent thermal stability, excellent radiation resistance, and vibration absorption. The excellent comprehensive properties of LCP make it an indi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38
Inventor 卜海山
Owner SHANGHAI PRET COMPOSITES
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