Structure-Property Relationships in Hybrid Cellulose Nanofibrils/Nafion-Based Ionic Polymer-Metal Composites
Structure-Property Relationships in Hybrid Cellulose Nanofibrils/Nafion-Based Ionic Polymer-Metal Composites
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DOI：
10.3390/ma12081269
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发表时间：
2019-04-02
期刊：
影响因子：
3.4
通讯作者：
Tabatabaie, Seyed Ehsan
中科院分区：
文献类型：
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作者：
Noonan, Colin;Tajvidi, Mehdi;Tabatabaie, Seyed Ehsan
在这里，我们报道了与纤维素纳米纤维(CNF)杂化的离子聚合物-金属复合材料(IPMC)的制备，作为Nafion((R))的部分替代品。其目的不仅是降低生产成本，提高各自的机械/热性能，而且还赋予此类产品相当程度的生物降解性。采用薄膜浇铸法制备了不同CNF/Nafion((R))比的配方。无裂纹薄膜被风干，并通过氧化还原反应在铂上镀一层。在电镀工艺之前，对所制备的杂化材料进行了热稳定性、力学和形态方面的分析，以检验其与Nafion基IPMC的性能对比。结果表明，CNF负载量越高，薄膜的拉伸强度和弹性模量越高，但延性越差。热重分析(TGA)表明，CNF的加入几乎线性地降低了复合膜的热稳定性，但其热分解起始温度仍保持在120℃以上，远高于复合膜的预期暴露温度。在配方中添加交联剂有助于在电镀过程中保持膜的完整性，从而改善表面传导性。目前的研究重点是薄膜的物理和形态特性，所提供的数据支持将CNF作为一种无毒和可持续的生物聚合物与用于电活性薄膜的全氟磺酸基共聚物(如Nafion((R)混合使用。
Herein, we report the production of ionic polymer-metal composites (IPMCs) hybridized with cellulose nanofibrils (CNF) as a partial substitute for Nafion((R)). The aim is not only to reduce the production cost and enhance respective mechanical/thermal properties but also to bestow a considerable degree of biodegradability to such products. Formulations with different CNF/Nafion((R)) ratios were produced in a thin-film casting process. Crack-free films were air-dried and plated by platinum (Pt) through an oxidation-reduction reaction. The produced hybrids were analyzed in terms of thermal stability, mechanical and morphological aspects to examine their performance compared to the Nafion-based IPMC prior to plating process. Results indicated that films with higher CNF loadings had improved tensile strengths and elastic moduli but reduced ductility. Thermogravimetric analysis (TGA) showed that the incorporation of CNF to the matrix reduced its thermal stability almost linearly, however, the onset of decomposition point remained above 120 degrees C, which was far above the temperature the composite membrane is expected to be exposed to. The addition of a cross-linking agent to the formulations helped with maintaining the integrity of the membranes during the plating process, thereby improving surface conductivity. The focus of the current study was on the physical and morphological properties of the films, and the presented data advocate the potential utilization of CNF as a nontoxic and sustainable bio-polymer for blending with perfluorosulfonic acid-based co-polymers, such as Nafion((R)), to be used in electroactive membranes.