Thermal and Mechanical Properties of Microporous Polyurethanes Modified with Reduced Graphene Oxide

Abstract

Microporous polyurethanes (MPU) were modified by adding 0.25%-1.25 wt% of reduced graphene oxide (RGO). The materials were prepared without solvent via in situ polymerization. From a technological point of view, it is very important to obtain functional materials by using reacting compounds only. The thermal characteristics of obtained MPU were investigated using TGA, DSC, and DMA techniques. In comparison to nonmodified microporous polyurethane, the thermal stability and mechanical properties of the modified systems have significantly improved. The temperature corresponding to the maximum degradation rate ( max ) for nanocomposites containing 1% and 1.25 wt% of RGO was 51 ∘ C higher than that observed for pure microporous PU system. The increase of tensile strength was also observed for matrix with the addition of 0.5 wt% RGO nanofiller.

The Effect of High Molecular Weight Bio-based Diamine Derivative of Dimerized Fatty Acids Obtained from Vegetable Oils on the Structure, Morphology and Selected Properties of Poly(ether-urethane-urea)s

“…The crystalline regions of the soft domains act as reinforcing factor and result in mechanical integrity of the prepared poly(ether-urethane-urea)s. Similar behavior was observed by Korley et al [24] in the case of semicrystalline segmented polyurethanes based on poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) macrodiol, 1,6-hexamethylene diisocyanate and 1,4-butanediol as a chain extender. The increasing of the storage modulus after the glass transition temperature can be also connected with the cold crystallization of the soft segments and the similar behavior was reported in the literature in the case of polyurethanes [25,26]. Figure 11 shows DSC thermogram obtained for the poly(ether-urethane-urea) synthesized using only bio-based diamine as a curing agent (PEtUM-1.0BA).…”

Polyurethane Foams: Past, Present, and Future

“…Different types of fillers and nanofillers, such as cellulose and lignocellulosic fibers [ 138 , 139 ], glass wool, glass microspheres or glass fibers [ 180 , 181 , 182 ], egg shell wastes [ 140 ], date palm particles [ 141 ], walnut and hazelnut shells [ 142 ], and esparto wool [ 143 ], just to mention a few, can be used to improve the structural and mechanical properties of PUFs. Despite having a significant effect on the thermal and electrical properties, materials such as carbon nanotubes (CNTs) [ 183 , 184 , 185 , 186 ], graphene [ 187 , 188 , 189 , 190 ], EG [ 35 ], carbon nanofibers (CNFs) [ 191 ], or inorganic fillers, such as Fe 3 O 4 [ 192 ], TiO 2 [ 193 ], and iron oxide [ 194 ] are also commonly used to improve the structural and mechanical properties of the foams.…”

Recent advances in experimental and molecular dynamics study of graphene-oxide/natural rubber composites: A review

“…This method has been touted as a cost-effective and efficient method of manufacturing high-quality rGO with properties close to pure graphene. rGO nanocomposites based on a variety of materials, including polystyrene, 69 epox, 70 poly(3-hexylthiophene), 71 poly(methyl methacrylate) 72 and polyurethanes, 73 have been studied extensively. Wu et al 74 used proanthocyanidin as a reducing agent to make NR/rGO composites.…”