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首页> 外文期刊>RSC Advances >Thermal transition behaviors, solubility, and mechanical properties of wholly aromatic para-, meta-poly(ether-amide)s: effect on numbers of para-aryl ether linkages
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Thermal transition behaviors, solubility, and mechanical properties of wholly aromatic para-, meta-poly(ether-amide)s: effect on numbers of para-aryl ether linkages

机译：热过渡行为，溶解性和全部芳族，Meta-Poly（醚酰胺）S的机械性能：对芳基醚键的数量的影响

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摘要

In order to make clear how the numbers of para-aryl ether linkages affect the solubility, thermal transition behavior and mechanical properties of para-(p-PEAs), meta-poly(ether-amide)s (m-PEAs), a series of para-substituted aryl ether diamine monomers with 2, 3, 4 or 5 ether linkages were synthesized, and then reacted with terephthalic acid and isophthalic acid via the Yamazaki-Higashi phosphorylation method to prepare wholly aromatic PEAs. The PEAs with intrinsic viscosity values in the range of 0.81-1.16 dL g(-1) were obtained and characterized by FT-IR, NMR, and elemental analysis. Although the T(g)s and T(m)s of PEAs decrease with the increasing numbers of aryl ether linkages, their T(g)s and T(m)s still are above 180 degrees C and 320 degrees C, respectively. p-PEAs have a high crystallinity making it difficult to dissolve them in common organic solvents even when 5 aryl ether linkages are introduced. Conversely, except for m-PEA5 with a lower polarity, the other m-PEAs show good solubility due to their low crystallinity. Besides, the decomposition temperatures at 5% weight loss of all PEAs exceed 430 degrees C and their residual yields at 700 degrees C are above 50% in N-2, illustrating that they have excellent thermal stability. It is found that by casting m-PEAs DMAc solution in a dish, the transparent films with high Young's modulus (2.6-3.5 GPa) can be successfully obtained.
机译：为了清楚甲芳基醚键的数量如何影响溶解度，热过渡行为和对（P-PEAS），Meta-Poly（醚酰胺）S（M-PEA）的溶解度，热过渡行为和机械性能，A系列合成具有2,3,4或5个醚键的对替代的芳基醚二胺单体，然后通过Yamazaki-Higashi磷酸化方法与对苯二甲酸和间苯二甲酸反应，以制备全芳族豌豆。获得的豌豆在0.81-1.16dLg（-1）范围内的固有粘度值，并通过FT-IR，NMR和元素分析表征。尽管豌豆的T（g）和豌豆的T（m）与芳基醚键的越来越多的蛋白，它们的T（g）s和t（m）S分别高于180℃和320℃。 P-Peas具有高结晶度，使得即使引入5个芳基醚键也难以将它们溶解在普通的有机溶剂中。相反，除了极性较低的M-PEA5外，其他M-PEA由于其低结晶度而显示出良好的溶解度。此外，5％重量损失的分解温度超过430℃，并且它们在700℃下的残留产率高于N-2的50％，示出了它们具有优异的热稳定性。结果发现，通过在盘中铸造M-PEA DMAC溶液，可以成功获得具有高杨氏模量（2.6-3.5GPa）的透明薄膜。

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  • 来源
    《RSC Advances》 |2016年第87期|共10页
  • 作者

    Zhang Wen-Qiang; Wang Xiu-Li; Liu Gui-Cheng; Chen Li; Wang Yu-Zhong;

  • 作者单位

    Sichuan Univ Coll Chem Ctr Degradable &

    Flame Retardant Polymer Mat State Key Lab Polymer Mat Engn Natl Engn Lab Ecof Chengdu 610064 Peoples R China;

    Sichuan Univ Coll Chem Ctr Degradable &

    Flame Retardant Polymer Mat State Key Lab Polymer Mat Engn Natl Engn Lab Ecof Chengdu 610064 Peoples R China;

    Sichuan Univ Coll Chem Ctr Degradable &

    Flame Retardant Polymer Mat State Key Lab Polymer Mat Engn Natl Engn Lab Ecof Chengdu 610064 Peoples R China;

    Sichuan Univ Coll Chem Ctr Degradable &

    Flame Retardant Polymer Mat State Key Lab Polymer Mat Engn Natl Engn Lab Ecof Chengdu 610064 Peoples R China;

    Sichuan Univ Coll Chem Ctr Degradable &

    Flame Retardant Polymer Mat State Key Lab Polymer Mat Engn Natl Engn Lab Ecof Chengdu 610064 Peoples R China;

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