Thermomechanical characterization of thermoplastic polyimide to improve the chain interaction via crystalline domains

Thermomechanical characterization of thermoplastic polyimide to improve the chain interaction via crystalline domains
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热塑性聚酰亚胺的热机械表征,通过晶域改善链相互作用

DOI:
10.1002/pen.25194
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发表时间:
2019
影响因子:
3.2
通讯作者:
Harmon, Julie P.
Harmon, Julie P.
中科院分区:
工程技术4区
文献类型:
--
作者:
Rivera Nicholls, Alejandro;Craft, Garrett;Perez, Yesenia;Pellissier, Matthew;Stock, John A.;Testemale, Maxime;Kull, Ken;Eubank, Jarrod;Harmon, Julie P.

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在之前对聚酰亚胺的研究中,我们将芳香族二胺单体与亚甲基连接体4,4 ′-亚甲基双(2,6-二甲基苯胺)结合,以使主链沿着脂肪族聚醚二胺主链连接体以降低刚性。在这份报告中,我们探讨了聚环氧乙烷到以前表征的聚合物的有组织的包装所提供的结晶区域的行为。该聚合物被设计成表现出介于常规芳族聚酰亚胺和具有全脂肪族醚二胺连接的聚合物之间的热性能,其目标是改善机械特性。通过动态力学分析和差示扫描量热法,它表明,聚环氧乙烷二胺的掺入和甲基侧挂基团的去除,以改善有组织的包装链。所有这些都允许聚酰亚胺的热性能和机械性能的可维持性的更宽范围。此外,结晶区是保持聚酰亚胺的温度稳定性同时保持可加工性的重要组分。通过傅里叶变换红外光谱、热机械和量热分析、显微硬度测量、拉伸测试和广角X射线散射对聚合物进行表征。Polym.工程索引,59:1919-1932,2019.© 2019塑料工程师学会
In a previous study on polyimides, we incorporated an aromatic diamine monomer with a methylene linker, 4,4′‐methylenebis(2,6‐dimethylaniline), to make a robust main chain along with aliphatic polyetherdiamine backbone linkers to decrease rigidity. In this report, we explore the behavior of crystalline regions provided by the organized packing of polyethylene oxide into the formerly characterized polymers. The polymers were designed to exhibit thermal properties in between those of conventional aromatic polyimides and polymers with wholly aliphatic ether diamine links, with a target to improve the mechanical characteristics. Through dynamic mechanical analysis and differential scanning calorimetry, it is shown that the incorporation of polyethylene oxide diamine and the removal of methyl pending groups serve to improve the organized packing of the chains. All of this allows for a broader range in tenability of thermal and mechanical properties of the polyimide. Furthermore, the crystalline regions are an important component to maintain the temperature stability of polyimide while maintaining the processability. The polymers are characterized by Fourier‐transform infrared spectroscopy, thermomechanical and calorimetric analysis, microhardness measurements, tensile testing, and wide‐angle X‐ray scattering. POLYM. ENG. SCI., 59:1919–1932, 2019. © 2019 Society of Plastics Engineers
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