Method for preparing elastic wood based on ultraviolet light initiated graft polymerization

A technology of graft polymerization and ultraviolet light, which is applied in the field of elastic wood preparation based on ultraviolet light-induced graft polymerization, can solve the problems of difficult to obtain biocompatible and high-transparency materials, lack of flexibility of solid wood, and mechanical properties of composite gels To achieve the effect of ensuring the natural mechanical properties, improving the generation efficiency, and improving the interface bonding

Active Publication Date: 2020-11-24
NANJING FORESTRY UNIV
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Problems solved by technology

[0005] At present, free radicals on the surface of natural wood cellulose are cross-linked with acrylamide to construct polyacrylamide composite gels, which require the use of a large amount of initiators, and the use of large amounts of initiators in polymer polymerization will cause environmental pollution, and the prepared composite gels The poor mechanical properties of the gel and the lack of flexibility of solid wood make it difficult to produce materials with high moisture content, high strength, high ductility, biocompatibility and high transparency, which in turn affects the applications in biosensing, biomedicine, and flexible devices. Applications in substrates, soft robots, etc.

Method used

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  • Method for preparing elastic wood based on ultraviolet light initiated graft polymerization
  • Method for preparing elastic wood based on ultraviolet light initiated graft polymerization
  • Method for preparing elastic wood based on ultraviolet light initiated graft polymerization

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preparation example Construction

[0034] The following are the concrete steps of the elastic wood preparation method of the present invention:

[0035] The first step: 10 pieces of balsa wood chips (density: 0.16-0.2g / cm2) of 50mm×50mm (length×width) 3 , thickness: 1-5mm) placed in 500ml, 2wt% sodium chlorite solution, acetic acid to adjust the pH to 4.5, and heated at 75°C for 4-8 hours to carry out delignification treatment on balsa wood. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0036] The second step: the specific method of treating the wood fiber skeleton with sodium hydroxide solution is: soak the wood fiber skeleton in 18wt%-22wt% sodium hydroxide solution for 2-4 hours at room temperature, and the gained sodium hydroxide pretreatment The final wood fiber skeleton is washed with dilute acid-water-ethanol step by step until neutral, and stored in ethanol.

[0037] Step 3: Put the weighing paper on the weighing balance, clear it ...

Embodiment 1

[0063] The first step: take 50mm×50mm×1mm longitudinal balsa wood chips (density: 0.16-0.2g / cm 3 ) placed in 500ml, 2wt% sodium chlorite solution, acetic acid to adjust the pH to 4.5, and heated at 75°C for 4 hours to carry out delignification treatment on balsa wood. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0064] Second step: the concrete method of processing wood fiber skeleton with sodium hydroxide solution is: soak wood fiber skeleton in the sodium hydroxide solution of 18wt% under room temperature condition for 2 hours, the wood fiber skeleton after gained sodium hydroxide pretreatment Rinse with dilute acid-water-ethanol step by step until neutral, and store in ethanol.

[0065] Step 3: Put the weighing paper on the weighing balance, clear it to zero, weigh 1.8g of acrylamide monomer (25%), pour it into a beaker, then use a measuring cylinder to measure 5.5g of water and pour it into the beaker...

Embodiment 2

[0070] Step 1: Put 50mm×50mm×5mm balsa wood chips in 500ml, 2wt% sodium chlorite solution, adjust pH to 4.5 with acetic acid, heat at 75°C for 8 hours, and perform delignification treatment on balsa wood. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0071] Second step: the concrete method of processing wood fiber skeleton with sodium hydroxide solution is: the wood fiber skeleton is immersed in the sodium hydroxide solution that concentration is 22wt% at room temperature for 4 hours, the wood after gained sodium hydroxide pretreatment The fibrous skeleton was washed step by step with dilute acid-water-ethanol until neutral, and then stored in ethanol.

[0072] Step 3: Put the weighing paper on the weighing balance, reset to zero, weigh 2.35g of acrylamide monomer, pour it into a beaker, and then weigh 8mg of cross-linking agent N,N-methylenebisacrylamide, Add to beaker. Measure 5.5 g of water with a grad...

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Abstract

The invention discloses a method for preparing elastic wood based on ultraviolet light initiated graft polymerization. The method comprises the following steps: by using balsa wood as a raw material,carrying out mild delignification treatment by using an acidic sodium chlorite solution to obtain a complete wood fiber skeleton; treating the obtained product with a sodium hydroxide alkaline solution; preparing a mixed solution of an acrylamide monomer and a cross-linking agent, and regulating the mixing ratio of the acrylamide monomer and the cross-linking agent; fully mixing the obtained product with an acrylamide monomer through an impregnation method; and putting the obtained product into a mold, and initiating a grafting cross-linking reaction through ultraviolet light with the wavelength of 320-380 nm to obtain polyacrylamide/wood fiber skeleton composite gel, namely the elastic wood. According to the method, the elastic wood can be prepared under the condition that a chemical initiator is not used, and due to the fact that the elastic wood has high biocompatibility, excellent mechanical performance and excellent light transmission performance, the elastic wood has potential application value in the fields of artificial skin, biosensors, soft tissue engineering materials, wearable flexible electronic base materials, stimulus response soft robots and the like.

Description

technical field [0001] The invention relates to the field of wood material processing, in particular to a method for preparing elastic wood based on ultraviolet light-induced graft polymerization. Background technique [0002] Cellulose is one of the most abundant natural renewable resources in nature, and most of the cellulose exists in plant cell walls. Through extraction, fibrillation and other treatments, high-strength nanocellulose with high aspect ratio and high specific surface area can be extracted from plant cell walls, and it is widely used as a reinforcing phase to improve the mechanical properties of polymers. Among them, grafting polymers on the surface of nanocellulose is one of the effective means to improve the mechanical strength of composite materials. However, most polymer grafting reactions involve the use of a large amount of chemical reagents such as organic solvents, crosslinking agents, and initiators, and are difficult to recycle, resulting in serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/56C08F222/38C08F2/48B27K3/04
CPCC08F289/00C08F2/48B27K3/04C08F220/56C08F222/385
Inventor 陈楚楚王怡仁周彤吴启静卜香婷周静李大纲
Owner NANJING FORESTRY UNIV
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