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    • 73. 发明授权
    • Liquid crystalline thermosets from ester, ester-imide, and ester-amide oligomers
    • 来自酯,酯 - 酰亚胺和酯 - 酰胺低聚物的液晶热固性材料
    • US06939940B2
    • 2005-09-06
    • US09757398
    • 2001-01-05
    • Theodorous J. DingemansErik S. WeiserTerry L. St. Clair
    • Theodorous J. DingemansErik S. WeiserTerry L. St. Clair
    • C08L101/12C08G63/60C08G63/685C08G69/44C08G73/16C09K19/38C08G73/06C09K19/06
    • C09K19/3823C08G63/60C08G63/6854C08G69/44C08G73/16C09K19/3804
    • Main chain thermotropic liquid crystal esters, ester-imides, and ester-amides were prepared from AA, BB, and AB type monomeric materials and were end-capped with phenylacetylene, phenylmaleimide, or nadimide reactive end-groups. The resulting reactive end-capped liquid crystal oligomers exhibit a variety of improved and preferred physical properties. The end-capped liquid crystal oligomers are thermotropic and have, preferably, molecular weights in the range of approximately 1000-15,000 grams per mole. The end-capped liquid crystal oligomers have broad liquid crystalline melting ranges and exhibit high melt stability and very low melt viscosities at accessible temperatures. The end-capped liquid crystal oligomers are stable for up to an hour in the melt phase. These properties make the end-capped liquid crystal oligomers highly processable by a variety of melt process shape forming and blending techniques including film extrusion, fiber spinning, reactive injection molding (RIM), resin transfer molding (RTM), resin film injection (RFI), powder molding, pultrusion, injection molding, blow molding, plasma spraying and thermo-forming. Once processed and shaped, the end-capped liquid crystal oligomers were heated to further polymerize and form liquid crystalline thermosets (LCT). The fully cured products are rubbers above their glass transition temperatures. The resulting thermosets display many properties that are superior to their non-end-capped high molecular weight analogs.
    • 主链热致液晶酯,酯 - 酰亚胺和酯 - 酰胺由AA,BB和AB型单体材料制成,并用苯乙炔,苯基马来酰亚胺或纳二酰胺反应性端基封端。 所得到的反应性封端的液晶低聚物表现出各种改进和优选的物理性质。 封端的液晶低聚物是热致变性的,并且优选分子量在约1000-15,000克/摩尔的范围内。 封端的液晶低聚物具有宽的液晶熔融范围,并且在可接近的温度下表现出高的熔体稳定性和非常低的熔体粘度。 封端的液晶低聚物在熔融相中稳定长达一个小时。 这些特性使得封端液晶低聚物可以通过各种熔融加工成型和共混技术加工,包括薄膜挤出,纤维纺丝,反应注射成型(RIM),树脂传递模塑(RTM),树脂薄膜注射(RFI) 粉末成型,拉挤成型,注射成型,吹塑成型,等离子喷涂和热成型。 一旦加工和成形,加热封端的液晶低聚物进一步聚合并形成液晶热固性塑料(LCT)。 完全固化的产品是高于其玻璃化转变温度的橡胶。 所得到的热固性材料显示出优于其非末端封端的高分子量类似物的许多性质。