Synthesis of CNT‐polyurethane nanocomposites using ester‐based polyols with different molecular structure: Mechanical, thermal, and electrical properties

Abstract

Polyurethanes (PUs) were prepared by in situ polymerization of three diisocyanate with three synthesized low cost esterbased polyols. The effect of diisocyanate type, diol structure, and molar ratio of diisocyanate to polyol on the mechanical properties was examined and the optimum chemical structure was introduced regarding the superior mechanical properties. Also, in presence of well dispersed hydroxylated multiwalled carbon nanotubes (CNT), PU/CNT nanocomposites were synthesized and fully characterized. The results showed that PU synthesized based on 1,4-butane diol (BDO) has the best mechanical properties and thermal stability. Also, the PU samples synthesized from 1,6-hexamethylene diisocyanate (HDI) were more profitable than aromatic diisocyanate structures due to higher crystallinity and microstructure packing. The nanocomposite sample containing 1.5% CNT was the optimum composition for the maximum tensile strength and electrical conductivity. This result was related to the uniform dispersion and bonding of CNTs to PU chains at this composition, while aggregates were formed at higher concentration of CNTs which increased the defects and reduced the uniformity of the structure.

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

“…Therefore, the peak intensity of PUIH is higher than all the other samples. However, after incorporation of GOSi into the hybrid composites matrix, intensity of this peak decreases, which shows the decrease of crystalline parts because of the presence of graphitic layers …”

Fabrication of electrical and thermal conductive thermoplastic polyurethanes‐based nanocomposite with azide polyurethane as interfacial compatibilizer

“…Reference [23] Reference [24] Reference [25] Reference [5] Abbreviations: CF, carbon fibers; MWCNTs, multiwall carbon nanotubes; PU, polyurethane; SWCNTs, single-walled carbon nanotubes.…”

“…Therefore, the materials with both electrical conductive and thermal conductive, which has great potential application in the electronic components, has received much attention in recent years. Thermoplastic polyurethane (TPU) is a kind of unique rubber material with the better elasticity, toughness, durability, and especially the outstanding elastic buffer property and then widely used in transportation, construction, mechanical engineering, and electronic equipment 2–6 . In order to meet the requirement of some specific application, such as buffer gasket in mobile phone and laptop, it is necessary to research and develop the TPU with both electrical conductivity and thermal conductivity.…”

Thermal stability and thermal oxidation kinetics of PU/CA‐MMT composites

“…Therefore, improving anti‐aging property of PU‐based materials will be of great magnificence . To this end, a lot of works have been done to focus on the improvement of anti‐aging property of PU‐based materials by incorporating fillers, such as clay, glass, carbon nanotubes, and graphene, and so forth. Among these fillers, clays, due to their inexpensiveness, have been extensively utilized to improve materials' physical and mechanical properties .…”