Synthesis and characterization of hard copolymer polyurethane/functionalized graphene nanocomposites: Investigation of morphology, thermal stability, and rheological properties
Synthesis and characterization of hard copolymer polyurethane/functionalized graphene nanocomposites: Investigation of morphology, thermal stability, and rheological properties
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DOI：
10.1002/app.53118
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发表时间：
2022-09-28
影响因子：
3
通讯作者：
Saiani, Alberto
中科院分区：
文献类型：
--
作者：
Albozahid, Muayad;Naji, Haneen Zuhair;Saiani, Alberto
提高聚氨酯的性能是一项至关重要的奋进，因为它具有多功能特性，使其适用于各种用途，特别是作为复合材料领域的基质。目前的工作调查的影响，除了两种类型的石墨烯衍生物，氧化石墨烯（GO）和还原氧化石墨烯（rGO），硬共聚物聚氨酯（HCPU）。HCPU作为纳米复合材料的合成使用熔融混合的方法与不同重量比的纳米填料添加剂。透射电子显微镜和扫描电子显微镜显示的形态，通过将纳米填料内的HCPU结构。热重分析（TGA）测试表明，随着GO和rGO的加入，HCPU的热稳定性增加。在此，与未填充的HCPU样品相比，在添加GO和rGO之后，总体HCPU结晶度/微相分离降低。热稳定性测试表明，由于纳米填料的屏障和曲折路径效应，随着GO和rGO掺入重量比的增加，热稳定性显著增强。发现导热性和导电性的明显增加，特别是与纯HCPU相比，rGO的添加含量（5重量%）更大。流变行为表明，HCPU纳米复合材料的储能模量从纯HCPU的增加，证明了在HCPU链结构内的填料-聚合物网络相互作用的形成。GO和rGO在聚氨酯链内的分散和物理和/或化学相互作用在增强形态和热和流变性能方面起主要作用，因此代表了HCPU纳米复合材料最终性能的显著改善。
Improving the performance of polyurethane is a crucial endeavor due to its versatile properties that make it suitable for various uses, especially as a matrix in the field of composite materials. The current work investigates the influence of the addition of two types of graphene derivatives, graphene oxide (GO) and reduced graphene oxide (rGO), to hard copolymer polyurethane (HCPU). HCPUs as nanocomposites were synthesized using melt-mixing approaches with different weight ratios of nanofiller additives. The transmission electron microscopy and scanning electron microscopy displayed the morphology through the incorporation of nanofillers within the HCPU structure. Thermogravimetric analysis (TGA) testing showed an increase in the thermal stability of HCPU with the addition of GO and rGO. Herein, the overall HCPU crystallinity/microphase separation decreased after the addition of GO and rGO compared to unfilled HCPU samples. The thermal stability test showed significant enhancement with increasing GO and rGO incorporated weight ratio due to the barrier and tortuous path effects of nanofillers. A clear increase in thermal and electrical conductivity is found, in particular at greater content of addition (5 wt%) of rGO in comparison with neat HCPU. The rheological behavior showed that the storage modulus of HCPU nanocomposites increased from that of pure HCPU, proving the formation of a filler-polymer network interaction within the HCPU chain structure. Dispersion and physical and/or chemical interaction of the GO and rGO within polyurethane chains plays a major role in enhancing the morphology and thermal and rheological properties, and thus represents a significant improvement for the final properties of HCPU nanocomposites.