Synthesis and properties of poly(dimethylsiloxane)-based non-isocyanate polyurethanes coatings with good anti-smudge properties

Liu, Canqun; Wu, Jiayi; Zhou, Xiaosong; Zhou, Xunfu; Wu, Zhijun; Qu, Jinqing

doi:10.1016/j.porgcoat.2021.106690

Cited by 20 publications

(29 citation statements)

References 39 publications

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“…Polyurethanes (PUs) have found applications in many areas of everyday’s life such as foams, elastic fibers, sealants, adhesives, and varnishes. − Due to their superb toughness and flexibility, some of them are widely used as thermoplastic elastomers. Unfortunately, the conventional synthesis of PUs causes many threats to the environment and people’s health.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Synthesis of Urea-Free Poly(carbonate-urethane) Elastomers

2022

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This work presents an eco-friendly synthetic pathway toward non-isocyanate poly(carbonate-urethane)s (NIPCUs) obtained from carbon dioxide and its simple derivativesorganic carbonates. Bis(hydroxyalkyl carbamate)s synthesized from ethylene carbonate and appropriate α,ω-diamines were used as polyurethane hard segment precursors while oligocarbonate diols as soft segment ones. The structures and properties of the obtained NIPCUs were explored by means of 1H NMR, 13C NMR, and FT-IR spectroscopies, MALDI-ToF mass spectrometry, DSC, and mechanical testing. Based on spectroscopic data as well as model reactions, it was demonstrated that the formation of the urea bonds was suppressed due to the presence of carbonate moieties. The reaction of urea bonds with carbonate residues led to urethane group formation. In addition, the influence of the polyurethane structure on the mechanical and thermal properties of the obtained polymers was studied. The obtained NIPCUs exhibited mechanical properties comparable to conventional polyurethane elastomers (e.g., a tensile strength of 32 MPa and an elongation at break of 800%). The described synthetic route is an straightforward way toward the replacement of conventional polyurethanes with environmentally friendly ones.

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Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Synthesis of Urea-Free Poly(carbonate-urethane) Elastomers

2022

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“…In addition, it is beneficial to improve the water resistance of coatings. In this work, all of the obtained WPU- g -PDMS x coatings have low water absorption (<0.7%) due to the high cross-linking and the hydrophobic PDMS enriched on the coating surface. − …”

Section: Resultsmentioning

confidence: 79%

Bio-Based Waterborne Polyurethane Coatings with High Transparency, Antismudge and Anticorrosive Properties

Lei

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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Green and environment-friendly preparation are of the utmost relevance to the development of transparent antismudge coatings. To prepare a waterborne polyurethane (WPU) coating with antismudge property, it is challenging to balance the stability of dispersion and the antismudge property of coating. Herein, we prepare a transparent bio-based WPU coating grafted with a minor proportion of poly(dimethylsiloxane) (WPU-g-PDMS) using renewable castor oil, monocarbinol-terminated PDMS, hexamethylene diisocyanate trimer, and 2,2-bis(hydroxymethyl)propionic acid as raw materials. Effects of the dosage of monocarbinol-terminated PDMS, the curing temperature, and the curing time on the antismudge performance were studied. Results showed that rigorous stirring (3000 rpm) is necessary to obtain a stable WPU-g-PDMS dispersion with a storage time longer than 6 months. A high curing temperature (>160 °C) and a period of curing time (>1 h) are indispensable to obtain the excellent antismudge property because they would facilitate the grafted low-surface-tension PDMS chains to migrate from the interior to the coating surface. The facts that simulated contaminated liquids such as water, HCl solution, NaOH solution, artificial blood, and tissue fluid could slide off easily and cleanly, and marker ink lined on the coating surface could shrink, indicated that the WPU-g-PDMS coating has good antismudge properties, which could be self-compensated shortly after deterioration. Due to the high cross-linking degree caused by multifunctional polyol and isocyanate, the WPU-g-PDMS coating has high hardness and good anticorrosive performance. The antismudge functionalization and waterborne technology of bio-based polyurethane coatings proposed in this work could be a promising contribution to the green and sustainable development of functional coatings. This kind of WPU-g-PDMS coating is expected to protect and decorate electronic screens, vehicles, and buildings, especially endoscopes.

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“…First, silicon’s presence in the studied samples should attract attention. According to the literature, silicon is often derived from dimethylsiloxane-based contaminants [ 25 , 30 ], and the introduction of GO slightly reduces the surface content of silicon. However, the most striking difference between the composition of the near-surface layers and the volume can be seen in Table 3 , which presents the C/O and C/N ratios for the samples under study.…”

Section: Resultsmentioning

confidence: 99%

On the State of Graphene Oxide Nanosheet in a Polyurethane Matrix

et al. 2023

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Thermally stable films were obtained from a water-based polyurethane (PU) dispersion with small (0.1–1.5 wt.%) additions of graphene oxide (GO). The films were studied through elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was found that the introduction of GO into a PU matrix was accompanied by a partial reduction in graphene oxide nanosheet and an increase in the concentration of defects in GO structure. It has been also established that the [C/N]at ratio in the near-surface layer of PU/GO composite films grows with an increase in the content of graphene oxide in the composite films.

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Synthesis and properties of poly(dimethylsiloxane)-based non-isocyanate polyurethanes coatings with good anti-smudge properties

Cited by 20 publications

References 39 publications

Environmentally Friendly Synthesis of Urea-Free Poly(carbonate-urethane) Elastomers

Environmentally Friendly Synthesis of Urea-Free Poly(carbonate-urethane) Elastomers

Bio-Based Waterborne Polyurethane Coatings with High Transparency, Antismudge and Anticorrosive Properties

On the State of Graphene Oxide Nanosheet in a Polyurethane Matrix

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