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Construction of Polyurethane-imide/Graphene Oxide Nanocomposite Foam with Gradient Structure and Its Thermal Mechanical Stability
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-10-03 , DOI: 10.1021/acs.iecr.8b02911 Chengjie Li 1 , Bing Hui 1 , Lin Ye 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-10-03 , DOI: 10.1021/acs.iecr.8b02911 Chengjie Li 1 , Bing Hui 1 , Lin Ye 1
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Graphene oxide (GO)@Fe3O4 nanohybrid with ferromagnetism was prepared and polyurethane-imide copolymer (PUI)/GO@Fe3O4 nanocomposite foams with gradient structure were first fabricated under a magnetic field. Fe3O4 nanoparticles intercalated into GO layers with high grafting ratio, resulting in complete exfoliation of GO in matrix. For the composite foam, the average cell size, cell wall thickness and apparent density gradually decreased along magnetic field direction, forming gradient cell structure in foam. Both mechanical property and thermal stability of foam were remarkably improved by addition of GO@Fe3O4. Compared with A region, in B region with enriched distribution of GO@Fe3O4, the compressive strength and modulus increased by 12.5 and 7.0%, respectively. The thermal degradation temperature, storage modulus, and Tg were obviously improved, indicating enhancement of thermal mechanical stability of PUI along magnetic field, revealing formation of gradient distribution of thermal mechanical property in foam, which showed potential application prospective in aerospace and defense area.
中文翻译：
梯度结构聚氨酯-酰亚胺/氧化石墨烯纳米复合泡沫的制备及其热力学稳定性
制备了具有铁磁性的氧化石墨烯（GO）@Fe 3 O 4纳米杂化体，首先在磁场下制备了具有梯度结构的聚氨酯-酰亚胺共聚物（PUI）/ GO @ Fe 3 O 4纳米复合泡沫。Fe 3 O 4纳米颗粒以高接枝率插入GO层中，导致GO在基质中完全剥落。对于复合泡沫，平均泡孔尺寸，泡孔壁厚和表观密度沿磁场方向逐渐减小，从而在泡沫中形成梯度泡孔结构。加入GO @ Fe 3 O 4可显着提高泡沫的机械性能和热稳定性。。与A区相比，在GO @ Fe 3 O 4富集的B区，抗压强度和模量分别提高了12.5％和7.0％。热降解温度，储能模量和T g明显提高，表明PUI沿磁场的热机械稳定性增强，揭示了泡沫中热机械性能梯度分布的形成，表明其在航空航天和国防领域的潜在应用前景。
更新日期：2018-10-03
中文翻译：
梯度结构聚氨酯-酰亚胺/氧化石墨烯纳米复合泡沫的制备及其热力学稳定性
制备了具有铁磁性的氧化石墨烯（GO）@Fe 3 O 4纳米杂化体，首先在磁场下制备了具有梯度结构的聚氨酯-酰亚胺共聚物（PUI）/ GO @ Fe 3 O 4纳米复合泡沫。Fe 3 O 4纳米颗粒以高接枝率插入GO层中，导致GO在基质中完全剥落。对于复合泡沫，平均泡孔尺寸，泡孔壁厚和表观密度沿磁场方向逐渐减小，从而在泡沫中形成梯度泡孔结构。加入GO @ Fe 3 O 4可显着提高泡沫的机械性能和热稳定性。。与A区相比，在GO @ Fe 3 O 4富集的B区，抗压强度和模量分别提高了12.5％和7.0％。热降解温度，储能模量和T g明显提高，表明PUI沿磁场的热机械稳定性增强，揭示了泡沫中热机械性能梯度分布的形成，表明其在航空航天和国防领域的潜在应用前景。
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