Natural urushiol as a novel under-water adhesive

Je, Hyeondoo; Won, Jongok

doi:10.1016/j.cej.2020.126424

Cited by 34 publications

(24 citation statements)

References 27 publications

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“…With the addition of PAN, the intensity of these peaks did not decrease, indicating that the number of O-H groups on the urushiol aromatic ring did not decrease. The vibration peaks of urushiol phenyl were observed at 1621 cm −1 and 1597 cm −1 [ 28 ], indicating that the urushiol/PAN membrane retained the structural characteristics of urushiol after adding PAN. The PAN nanofibers displayed characteristic vibrations at 2243 cm −1 for ν(C≡N), 2929 cm −1 for ν(CH 2 ), and 1452 cm −1 for δ(CH 2 ) [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

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Preparation of Nanoscale Urushiol/PAN Films to Evaluate Their Acid Resistance and Protection of Functional PVP Films

Shiu

Zhang

et al. 2021

Nanomaterials

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Different amounts of urushiol were added to a fixed amount of polyacrylonitrile (PAN) to make nanoscale urushiol/PAN films by the electrospinning method. Electrospinning solutions were prepared by using dimethylformamide (DMF) as the solvent. Nanoscale urushiol/PAN films and conductive Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)/polyvinyl pyrrolidone (PVP) films were prepared by electrospinning. In order to prepare an electrospun sandwich nanoscale film, urushiol/PAN films were deposited as both the top and bottom layers and PEDOT:PSS/PVP film as the inner layer. When the PAN to urushiol ratio was 7:5, the fiber diameter ranged between 150 nm and 200 nm. The single-layer urushiol/PAN film could not be etched after being immersed into 60%, 80%, and 100% sulfuric acid (H2SO4) for 30 min, which indicated the improved acid resistance of the PAN film. The urushiol/PAN film was used to fabricate the sandwich nanoscale films. When the sandwich film was immersed into 80% and 100% H2SO4 solutions for 30 min, the structure remained intact, and the conductive PVP film retained its original properties. Thus, the working environment tolerability of the functional PVP film was increased.

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Section: Resultsmentioning

confidence: 99%

“…Preparation of urushiol: Twenty grams of anhydrous ethanol were added to 5 g of raw lacquer in a beaker and sonicated for 2 h. Impurities in the solution were filtered by a filter paper, and anhydrous ethanol in the solution was removed by the rotary evaporation extraction method at 60 °C to obtain urushiol [ 28 ].…”

Section: Methodsmentioning

confidence: 99%

Preparation of Nanoscale Urushiol/PAN Films to Evaluate Their Acid Resistance and Protection of Functional PVP Films

Shiu

Zhang

et al. 2021

Nanomaterials

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“…The enzyme-catalysed polymerisation of oriental lacquer sap collected from lacquer trees in Asia allows it to be used as an energy-saving and environmentally friendly coating material with antibacterial, antiseptic, waterproof, and chemically resistant actions [1] , [2] , [3] , [4] , [5] , [6] , [7] . The lacquer thin films ensure excellent physicochemical properties such as high thermal stability, superior durability, anti-corrosiveness, good adhesion, and high gloss [8] , [9] , [10] .…”

Section: Introductionmentioning

confidence: 99%

“…However, the drying process, which requires severe and strict conditions (approximately 70–90% relative humidity (RH) at 20–30 °C), has been issued a critical factor that hinders practical application in industrial fields, even though it is a biodegradable, renewable resource. The long drying time of lacquer sap is caused by stable diene bonds of urushiol, which is a main lacquer constituent [2] , [11] , [12] . Moreover, the resultant film is severely discoloured from caramel-like yellow to turbid deep brown as the polymerisation process is completed [13] .…”

Section: Introductionmentioning

confidence: 99%

Nano-emulsification of oriental lacquer sap by ultrasonic wave propagation: Improvement of thin-film characteristics as a natural resin

Hwang

Park

et al. 2021

Ultrasonics Sonochemistry

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“…Je et al conducted the curing reaction between natural urushiol and Fe 3+ . The cross-linked network urushi that is formed by chemical bonds of urushiol and Fe 3+ -coordination bonds was used as an underwater adhesive [9]. Lu et al wrapped Ag nano particles in natural urushiol to form ocean anti-fouling coating, investing how the coating layer constrained the growth of fungus and microalgae [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Compound Phosphorus-Nitrogen Intumescent Flame Retardant for Applications to Raw Lacquer

Shiu

Lou

et al. 2021

Polymers

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Raw lacquer (RL) is a natural polymer compound with highly promising applications; however, its inflammable attribute restricts the industrial applications. In this study, melamine is used to formulate tri (1-melamine-2-propanol) phosphate (FR-1), after which it is synthesized with ammonium phosphate (FR-2) and diatomite to form a compound phosphorus-nitrogen intumescent flame retardant (IFR). Next, IFR is used as the filling agent that then cross-links with RL, and as such RL/IFR membranes are formed after the curing. The limiting oxygen index (LOI) measurement, the vertical combustion test (UL-94), the microshape calorimetric analysis (CCT), and the thermal gravimetric analysis (TGA) are conducted to examine the combustion resistance and thermal stability of the membranes. Fourier transform infrared spectroscopy (FT-IR) and electron scanning microscope (SEM) are performed to separately characterize the structure and compatibility; the mechanical properties of the membranes are also evaluated. The vertical combustion test results confirm that with 30 wt% of IFR, RL/IFR membranes acquire 12.3% higher LOI and a vertically combustion of V-0 level. The TGA indicates that RL/IFR membranes demonstrate a greater adhesion level, a higher rigidity, and better luster than pure RL membranes.

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Natural urushiol as a novel under-water adhesive

Cited by 34 publications

References 27 publications

Preparation of Nanoscale Urushiol/PAN Films to Evaluate Their Acid Resistance and Protection of Functional PVP Films

Preparation of Nanoscale Urushiol/PAN Films to Evaluate Their Acid Resistance and Protection of Functional PVP Films

Nano-emulsification of oriental lacquer sap by ultrasonic wave propagation: Improvement of thin-film characteristics as a natural resin

Synthesis of a Compound Phosphorus-Nitrogen Intumescent Flame Retardant for Applications to Raw Lacquer

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