One pot synthesis of bio-based porous isocyanate-free polyurethane materials

Singh, Pooja; Kaur, Raminder

doi:10.1016/j.matlet.2022.133433

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…Urethane bonds are the most thermally labile fragments in NIPU chains, and their decomposition, which results from the breaking of the -C-N bond, forms ammonia, carbon dioxide, and carbon oxide. This step overlapped with the second decomposition stage, which happened from 400 to 460 °C, attributed to the C-C bond cleavage and rapid decomposition of ether bonds and aliphatic hydrocarbon chains of diamine constituents [13,14,61]. With careful looking at the TGA/DTG thermograms, significant differences in the thermal decomposition of the synthesized NIPUs with different diamines can be seen.…”

Section: Thermal Stabilitymentioning

confidence: 95%

“…Non-isocyanate polyurethanes (NIPUs) can be synthesized through different procedures, including polycondensation, polyaddition, ring-opening polymerization, and rearrangement. From these, the polyaddition of multifunctional cyclic carbonates and primary diamines or polyamines has been considered the most common procedure for synthesizing NIPUs with potential industrial importance [11][12][13]. NIPU, also known as polyhydroxyurethane (PHU), is synthesized through this reaction, which is also known as aminolysis of cyclic carbonates and consists of pendant hydroxyl moieties with intermolecular hydrogen bonding.…”

Section: Introductionmentioning

confidence: 99%

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Environmentally friendly polyurethanes based on non-isocyanate synthesis

Farzan,

Borandeh,

Baniasadi

et al. 2024

Express Polym. Lett.

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A series of environmentally friendly non-isocyanate polyurethanes (NIPUs) was synthesized through a polycondensation reaction of as-synthesized semi-bio-based bis-cyclic carbonate with diamine derivatives. The synthesis of biscyclic carbonate was realized, for the first time, from 1-thioglycerol and polyethylene glycol diacrylate via thiol-ene click and transcarbonation reaction, respectively. The impacts of using different diamine derivatives on the chemical structural, mechanical properties, thermal stability, and surface wettability of the NIPUs were determined. It was found that the NIPU containing fatty acid-based diamine decomposed at a lower temperature than that of other polymers. Besides, it demonstrated a lower Young's modulus and a higher tensile strain at break, possibly due to its four-branched structure and greater flexibility. Meanwhile, the NIPU prepared with p-xylylenediamine provided the highest decomposition temperature, owing to an aromatic moiety in the polymer's backbone, which improved its stiffness and thermal stability. Furthermore, it was understood that the NIPU containing diamino-N-methyldipropyl-amine exhibited a higher Young's modulus and a lower tensile strain at break, as it had a nitrogen atom in its structure and a trigonal pyramidal configuration with the highest density of hydrogen bonds between polymer chains. Most of the developed NIPUs displayed hydrophobic surface properties, offering promising alternatives to isocyanate-based coating materials.

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Section: Thermal Stabilitymentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Environmentally friendly polyurethanes based on non-isocyanate synthesis

Farzan,

Borandeh,

Baniasadi

et al. 2024

Express Polym. Lett.

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Preparation of a polyurethane‐coated expandable graphite and its flame retardant application in rigid polyurethane foams

Qiao,

Zhang,

Guo

et al. 2024

J of Applied Polymer Sci

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Expandable graphite (EG) is widely used in rigid polyurethane (PU) foam (RPUF) as flame retardant, however, the mechanical properties of RPUF would deteriorate with the increase of its content. To alleviate this problem, PU‐coated EG (PUEG) is prepared by coating PU on the surface of EG via interface polymerization. PUEG is characterized by FTIR, XPS, and SEM. The results show that PUEG is successfully prepared. Compared with the RPUF add with the pure EG, the compressive strength and flame retardancy of the RPUF prepared by adding 15% PUEG have been improved to varying degrees. A 15% PUEG and 20% PUEG modify RPUFs obtained both UL‐94 V‐0 rating with LOI values of 29.7% and 31.2%, respectively. The improvement in the flame retardancy and compressive strength of RPUF is due to the good interfacial compatibility between the RPUF and PU on the surface of the EG and the increased coking rate of the EG, which accelerates the formation of the thermal barrier carbon layer. The preparation process of PUEG is simple and suitable for large‐scale production.

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Fructose-Based Non-Isocyanate Polyurethane/Poly (Sodium Acrylate) Hydrogels: Design, Synthesis and Environmental Applications

Singh,

Kaur

2024

J Polym Environ

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One pot synthesis of bio-based porous isocyanate-free polyurethane materials

Cited by 7 publications

References 8 publications

Environmentally friendly polyurethanes based on non-isocyanate synthesis

Environmentally friendly polyurethanes based on non-isocyanate synthesis

Preparation of a polyurethane‐coated expandable graphite and its flame retardant application in rigid polyurethane foams

Fructose-Based Non-Isocyanate Polyurethane/Poly (Sodium Acrylate) Hydrogels: Design, Synthesis and Environmental Applications

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