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首页> 外文期刊>RSC Advances >Synthesis of novel thermotropic liquid crystalline polymers by a reactive extrusion process
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Synthesis of novel thermotropic liquid crystalline polymers by a reactive extrusion process

机译：通过反应挤出法合成新型热致液晶聚合物

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摘要

The syntheses of new thermotropic liquid crystalline polymers (TLCPs) were carried out via the polyaddition reactions of diepoxy-containing mesogens and a monoamine (1-naphthylamine). Both bulk polymerization and reactive extrusion were tested. The reaction between the two epoxy rings on the mesogen unit and the primary amine produces a thermotropic liquid crystalline polymer in the extruder. The amine group combines with the two epoxy rings in a single step via a polyaddition reaction to produce thermotropic liquid crystalline polymers without the formation of any by-products. Both polymers were found to exhibit nematic mesophase characteristics, which were examined by using polarized optical microscopy. The new thermotropic liquid crystalline polymers obtained with the bulk reaction have high molecular weights, whereas the polymers synthesized by using reactive extrusion have low molar mass due to their short residence times in the extruder. All the synthesized TLCPs were found to exhibit high thermal stability. Their decomposition temperatures were found to be above 350 degrees C, but their melting temperatures are low (below 250 degrees C). The liquid crystalline structures of the TLCPs were verified by performing 2D X-ray diffraction measurements. Scanning electron micrographs of the drawn polymer fibers show that the orientation of their morphologies lies predominantly along the direction of the fibers. The polymers synthesized with the reactive extrusion process have the same physical properties as those obtained with the bulk polyaddition reaction. This observation demonstrates the feasibility of the mass production of new TLCPs through reactive extrusion.
机译：通过含Diepoxy的脱蛋白和单胺（1-萘胺）的聚酰胺反应进行新的热致液晶结晶聚合物（TLCP）的合成。测试块状聚合和反应性挤出。两种环氧环之间的反应在介糖衣机组中，伯胺在挤出机中产生热致液晶聚合物。胺基通过多淀反应在单一步骤中与两个环氧环结合，以产生热致液晶聚合物，而不形成任何副产物。发现两种聚合物表现出征征中间相特征，通过使用偏振光显微镜检查。用大量反应得到的新的热致液晶聚合物具有高分子量，而通过使用反应挤出合成的聚合物具有低摩尔物质，因为它们在挤出机中的短暂停留时间。发现所有合成的TLCPS都表现出高热稳定性。发现它们的分解温度高于350℃，但它们的熔化温度低（低于250℃）。通过进行2D X射线衍射测量来验证TLCP的液晶结构。扫描电子纤维的扫描电子显微照片表明它们的形态的取向主要位于纤维的方向上。用反应挤出方法合成的聚合物具有与用块状聚酰胺反应获得的相同的物理性质。该观察结果展示了通过反应性挤出的新型TLCP的批量生产的可行性。

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  • 来源
    《RSC Advances》 |2019年第22期|共6页
  • 作者

    Oh Kyunghwan; Kim Hoyeon; Seo Yongsok;

  • 作者单位

    Seoul Natl Univ Coll Engn Sch Mat Sci &

    Engn RIAM Kwanakro 1 Seoul 151744 South Korea;

    Seoul Natl Univ Coll Engn Sch Mat Sci &

    Engn RIAM Kwanakro 1 Seoul 151744 South Korea;

    Seoul Natl Univ Coll Engn Sch Mat Sci &

    Engn RIAM Kwanakro 1 Seoul 151744 South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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