论文标题
使用细菌纳米纤维素作为硬段的纳米结构刚性聚氨酯泡沫具有改进的特定热机械特性
Nanostructured rigid polyurethane foams with improved specific thermo-mechanical properties using Bacterial Nanocellulose as a Hard Segment
论文作者
论文摘要
细菌纳米纤维素（BNC）根据其与异氰酸酯前体（ISO途径）的反应以及使用常规程序（POL oute）合成刚性聚氨酯泡沫（RPUF）。结果表明仅在0.1 wt。发现了BNC的百分比，特定弹性压缩模量（+244.2％）和强度（+77.5％）的急剧改善。通过测量异氰酸酯数量来证实BNC与前体的反应，而BNC引起了显着的成核效应，将细胞大小降低到39.7％。 DSC分析表明，BNC对固结后焓有很大影响，在实施ISO路线时降低了其价值。 DMA分析表明，使用ISO途径开发的RPUFS被证明具有改善的阻尼因子，而不论BNC浓度如何。这些结果强调了使用ISO途径实现具有改进特定机械性能的泡沫纳米复合材料的重要性。
Bacterial nanocellulose (BNC) was used to synthesize rigid polyurethane foams (RPUFs) based on its reaction with the isocyanate precursor (ISO route) and also by using the conventional procedure (POL route). The results indicated that at only 0.1 wt. % of BNC, drastic improvements of specific elastic compressive modulus (+244.2 %) and strength (+77.5 %) were found. The reaction of BNC with the precursor was corroborated through the measurement of isocyanate number and the BNC caused a significant nucleation effect, decreasing the cell size up to 39.7%. DSC analysis revealed that the BNC had a strong effect on post-cure enthalpy, decreasing its value when the ISO route was implemented. DMA analysis revealed that the RPUFs developed using the ISO route proved to have an improved damping factor, regardless of BNC concentration. These results emphasize the importance of using the ISO route to achieve foamed nanocomposites with improved specific mechanical properties.
