INFLUENCE OF THE CHEMISTRY OF THE FOAMING COMPOSITION ON THERMAL AND MECHANICAL PROPERTIES OF THE FORMING POLYIMIDE FOAM

Izvestiâ Sankt-Peterburgskogo gosudarstvennogo tehnologičeskogo instituta (tehničeskogo universiteta) Pub Date : 2023-01-01 DOI:10.36807/1998-9849-2023-66-92-73-78

Konstantin S. Polotnyanshchikov, Gleb V. Vaganov, Almaz M. Kamalov, Elena M. Ivankova, Aleksey G. Ivanov, Elena N. Popova, Lyudmila A. Myagkova, Valentin M. Svetlichnyi, Vladimir E. Yudin

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Abstract

Foaming prepolymer compositions based on 4,4'-diphenyloxytetracarboxylic acid dianhydride ethyl ester, 4,4'-diaminodiphenyl ether, 1,6-hexamethylenediamine and surfactant are synthesized. The structure of the synthesized compounds is confirmed by the IR spectroscopy; the data of scanning electron microscopy of samples of the formed foam materials are presented. The influence of the components of the foaming composition (surfactant and aliphatic diamine) on the structure, thermal and mechanical properties of the resulting polyimide foams is traced. The possibility of controlling the pore sizes in the foam material by selecting different fractions (250-400 μm) of particles of a powdered foam composition for heat treatment has been shown. The resulting foams have high thermal stability (the onset of weight loss is observed in the range of 470-499 °C); their density varies from 7.57 to 16.60 kg/m3; Young's modulus in compression is in a range of 200-270 kPa, stress at fracture lies within the range from 6.47 to 17.77 kPa

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发泡成分的化学性质对成型聚酰亚胺泡沫热性能和力学性能的影响

合成了以4,4′-二苯基氧基四羧酸二酐乙酯、4,4′-二氨基二苯基醚、1,6-六亚甲二胺和表面活性剂为基础的发泡预聚物。合成化合物的结构经红外光谱确证;给出了泡沫材料成型样品的扫描电镜数据。研究了泡沫成分(表面活性剂和脂肪族二胺)对聚酰亚胺泡沫的结构、热性能和力学性能的影响。通过选择不同分数(250 ~ 400 μm)的粉末泡沫组合物进行热处理，可以控制泡沫材料的孔径。所得泡沫具有高热稳定性(在470-499°C范围内观察到重量损失的开始);它们的密度从7.57到16.60 kg/m3不等;压缩杨氏模量在200 ~ 270 kPa之间，断裂应力在6.47 ~ 17.77 kPa之间

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Izvestiâ Sankt-Peterburgskogo gosudarstvennogo tehnologičeskogo instituta (tehničeskogo universiteta)

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