Development of sunflower oil‐based nonisocyanate polyurethane/multiwalled carbon nanotube composites with improved physico‐chemical and microwave absorption properties

Abstract

In this article, we have developed sunflower oil based non‐isocyanate polyurethane (NIPU)/amine functionalized multiwalled carbon nanotube (AF‐CNT) composites. First, carbonated sunflower oil (CSFO) was obtained by solvent‐free mixture reaction of CO2 with epoxidized sunflower oil under the conditions (120°C, 40 bar) for 10 h, and characterized by FTIR, 1H NMR and 13C NMR. Then, NIPUs were synthesized by reacting the CSFO with isophorone diamine (IPDA) and subsequently, the effects of different weight percentages (0–2 wt%) of AF‐CNTs on physico‐chemical properties of the NIPU/AF‐CNT composites were examined. FT‐IR, XRD and SEM analyses confirmed the formation of the polymer nanocomposites. The results of the studies showed that polymer nanocomposites exhibited better performance than that of pristine polymer. In addition to the improvement in physico‐chemical properties, the electromagnetic interference shielding properties of the composites (1.5 wt% AF‐CNTs) were also calculated in the 8.2–12.4 GHz (X‐band) frequency range with different thicknesses. It is seen that the composite (1.5 wt%) with thickness 3 mm shows the highest microwave absorption with −17 dB at 10.86 GHz. POLYM. COMPOS., 40:E1120–E1130, 2019. © 2018 Society of Plastics Engineers

Promising approaches to improve the performances of hybrid non‐isocyanate polyurethane

“…In order to solve these shortcomings, many groups have put effort into the development of highly efficient catalysts for the synthesis of NIPU as well as studying the structure–performance relationship of NIPU . Besides, the incorporation of fillers, such as silicone backbones, ZnO, graphene oxide and carbon nanotubes, is also carried out to enhance the performance of NIPU.…”

Synthesis and surface modification of sunflower oil‐based non‐isocyanate polyurethane: Physicochemical and antibacterial properties

“…The chemical shifts at 2.98–3.1 ppm of CH protons attached to the oxygen atoms of the epoxy groups, 53 confirm the formation of mono epoxides and di epoxides from mono and polyunsaturated fatty acids 54 . The disappearance of the CH in the α‐position of ESFO epoxy at 2.95–3.13 ppm and the new signal at 4.64 ppm of CH in the α‐position of cyclic carbonate group of CSFO confirms the conversion 55 …”

Bio‐based Poly(hydroxy urethane)s: Synthesis and Pre/Post‐Functionalization

“…Triglycerides typically produce pol(cyclic carbonate)s precursors by epoxidizing their double bonds in the presence of various catalysts and reaction conditions under supercritical CO 2 . In this context, triglycerides from several vegetable oils, including linseed, [21] camelina, [21] soybean, [13a,22] cottonseed, [23] sunflower oil, [24] and Jatropha curcas oil (JCO), [1a,10] have been reported in literature as raw materials for BPHU synthesis over the years. In fact, fatty acid derivatives such as, methyl oleate and methyl undecenoate are used to generate bis 5‐and 6‐membered CC precursors produces (Scheme 2).…”