In this study, a novel and facile one-step synthesis route was conducted to prepare semi-aromatic polyamide elastomer (PAPXD/1214-PEA) with p-phenylenediamine, dodecane diamine, dodecanedioic acid and polyether amine (PEA) as monomers. A systematic investigation has been conducted into the effect of hard segment content on the thermal, mechanical and solvent resistance of polymers when semi-aromatic polyamides are used as hard segments. It was found that the melting point of the copolymers gradually increased from 191.2 °C to 231.5 °C with the hard segment content increased from 39 % to 76 %, while the Vicat softening temperature (VST) enhanced from 103.2 °C to 192.2 °C. Compared with the commercial polyamide elastomer Pebax (produced by Arkema Inc) with similar hard segment contents, the VST of PAPXD14/1214-PEA were 17.4–66.2 °C higher. The mechanical performance of these elastomers was also largely improved with tensile strength increasing from 15.1 to 40.6 MPa, Young's modulus from 28.2 to 168.7 MPa, toughness from 91.1 to 170.7 MJ/m. In addition, the solvent resistance properties of PAPXD14/1214-PEA was compared with the commercial polyamide elastomer Pebax. After soaking in hydrochloric acid for 24 h, the tensile strength of PAPXD/1214-PEA with the hard segment content increased from 50 % to 63 % decreased down to 9.4 and 14.4 MPa, respectively. While the commercial polyamide elastomer Pebax (with similar hard segment content) decreased down to 1.5 and 4.3 MPa, indicating the commercial polyamide elastomer products were deteriorated. This suggests the corrosion resistance of the synthesized PAPXD/1214-PEA is much better than that of commercial product, and these semi-aromatic polyamide elastomers can be potentially applied in some harsh service environment especially for high temperature and corrosion sealing.

中文翻译：

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PAPXD/1214-PEA 热塑性弹性体的一步简便途径合成：结构和性能


本研究采用一种新颖、简便的一步合成路线，以对苯二胺、十二烷二胺、十二烷二酸和聚醚胺（PEA）为单体制备半芳香族聚酰胺弹性体（PAPXD/1214-PEA）。当使用半芳香族聚酰胺作为硬链段时，对硬链段含量对聚合物的耐热性、机械性和耐溶剂性的影响进行了系统的研究。结果发现，随着硬链段含量从39%增加到76%，共聚物的熔点从191.2℃逐渐升高到231.5℃，而维卡软化温度（VST）从103.2℃提高到192.2℃。 。与硬段含量相似的商用聚酰胺弹性体Pebax（阿科玛公司生产）相比，PAPXD14/1214-PEA的VST高出17.4–66.2°C。这些弹性体的机械性能也大幅提高，拉伸强度从 15.1 增加到 40.6 MPa，杨氏模量从 28.2 增加到 168.7 MPa，韧性从 91.1 增加到 170.7 MJ/m。此外，将 PAPXD14/1214-PEA 的耐溶剂性能与商用聚酰胺弹性体 Pebax 进行了比较。在盐酸中浸泡24 h后，硬段含量从50%增加到63%的PAPXD/1214-PEA的拉伸强度分别下降至9.4和14.4 MPa。而商用聚酰胺弹性体 Pebax（具有相似的硬链段含量）则下降至 1.5 和 4.3 MPa，表明商用聚酰胺弹性体产品已劣化。 这表明合成的PAPXD/1214-PEA的耐腐蚀性比商业产品好得多，并且这些半芳香族聚酰胺弹性体可以潜在地应用于一些恶劣的使用环境，特别是高温和腐蚀密封。