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Dynamic covalent cross-linked cellulose-based bioplastic, wood-plastic composite material and preparation method and application thereof

A cellulose-based, covalent cross-linking technology, applied in the field of material chemistry, can solve the problems that plastics cannot be chemically and biologically degraded, cannot be sustainable and degradable, and the synthesis process is complex, so as to improve interfacial compatibility, Ease of industrial production and simple production process

Active Publication Date: 2020-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the raw materials of plastics such as polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC) used in the preparation of traditional wood-plastic composites are non-renewable, and these plastics cannot be chemically and biologically degraded. Make traditional wood-plastic composite materials unable to have important characteristics such as sustainability and degradability
At the same time, the synthesis process of biomass-based plastics such as polylactic acid and PBS is complex and costly, and they are not suitable as raw materials for the production of wood-plastic composite materials.

Method used

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  • Dynamic covalent cross-linked cellulose-based bioplastic, wood-plastic composite material and preparation method and application thereof
  • Dynamic covalent cross-linked cellulose-based bioplastic, wood-plastic composite material and preparation method and application thereof
  • Dynamic covalent cross-linked cellulose-based bioplastic, wood-plastic composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This example provides a method for preparing cellulose-based bioplastic 1 by polymerizing dialdehyde cellulose and butylenediamine.

[0064] The preparation method of the cellulose-based bioplastic 1 comprises the following steps;

[0065] (1) Preparation of dialdehyde cellulose: disperse 2 g of microcrystalline cellulose in 250 ml of water, add 3.2 g of sodium periodate, and react at 50°C for 10 hours to obtain dialdehyde cellulose;

[0066] (2) Synthesis of dynamically covalently cross-linked cellulose gels: such as figure 1 and figure 2 As shown, dissolve 0.5g dialdehyde cellulose in 8ml DMSO for 1.5h, add butanediamine according to the molar ratio of aldehyde group to amine group of 1:1, and react at room temperature for 8h to obtain 100% dynamically covalently crosslinked fibers plain gel;

[0067] (3) Obtaining cellulose-based dynamic covalent polymer powder: fully wash the cellulose gel with ethanol, and then vacuum-dry it at 60° C. for 12 hours to obtain cel...

Embodiment 2

[0070] This example provides a method for preparing cellulose-based bioplastic 2 by polymerizing dialdehyde cellulose and pentamethylenediamine.

[0071] The preparation method of the cellulose-based bioplastic 2 comprises the following steps;

[0072] (1) Preparation of dialdehyde cellulose: disperse 2 g of microcrystalline cellulose in 250 ml of water, add 3.2 g of sodium periodate, and react at 50°C for 10 hours to obtain dialdehyde cellulose;

[0073] (2) Synthesis of dynamically covalently cross-linked cellulose gels: such as figure 1 and figure 2 As shown, dissolve 0.5g dialdehyde cellulose in 8ml DMSO for 1.5h, add pentamethylenediamine according to the molar ratio of aldehyde group to amine group of 1:1, and react at room temperature for 8h to obtain 100% dynamically covalently crosslinked fibers plain gel;

[0074] (3) Obtaining cellulose-based dynamic covalent polymer powder: fully wash the cellulose gel with ethanol, and then vacuum-dry it at 60° C. for 12 hours...

Embodiment 3

[0077] This example provides a method for preparing cellulose-based bioplastic 3 by polymerizing dialdehyde cellulose and hexamethylenediamine.

[0078] The preparation method of the cellulose-based bioplastic 3 comprises the following steps;

[0079] (1) Preparation of dialdehyde cellulose: disperse 2 g of microcrystalline cellulose in 250 ml of water, add 3.2 g of sodium periodate, and react at 50°C for 10 hours to obtain dialdehyde cellulose;

[0080] (2) Synthesis of dynamically covalently cross-linked cellulose gels: such as figure 1 and figure 2 As shown, dissolve 0.5g of dialdehyde cellulose in 8ml of DMSO for 1.5h, add hexamethylenediamine according to the molar ratio of aldehyde group to amine group of 1:1, and react at room temperature for 8h to obtain 100% dynamically covalently crosslinked fibers plain gel;

[0081] (3) Obtaining cellulose-based dynamic covalent polymer powder: fully wash the cellulose gel with ethanol, and then vacuum-dry it at 60° C. for 12 h...

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Abstract

The invention belongs to the field of material chemistry, and particularly discloses a dynamic covalent cross-linked cellulose-based bioplastic, a wood-plastic composite material and a preparation method thereof. According to the method, a hydrogen bond bonding network among cellulose molecular chains is reconstructed into a dynamic covalent bond linking network so that the cellulose-based bio-based plastic which is hot-workable, high in strength, high in modulus, degradable and recyclable is prepared. Compared with most existing hydrogen bond linked cellulose-based materials, the cellulose-based bioplastic prepared by the method is formed by crosslinking through dynamic covalent bonds so that the cellulose-based bioplastic has excellent reprocessing, hot processing and degradability. Theinterfacial compatibility of the novel wood-plastic composite material prepared from the graphene oxide and biomass can be improved through hydrogen bond interaction between two phases so that the novel wood-plastic composite material has higher tensile strength and Young modulus.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a dynamically covalently cross-linked cellulose-based bioplastic, a wood-plastic composite material and a preparation method and application thereof. Background technique [0002] Plastic is an indispensable class of synthetic polymer materials in human life. However, due to the non-degradability of plastics and high recycling costs, only about 9% of plastics can be recycled at present. A large amount of these waste plastics are landfilled or discharged into the ocean, which has posed a serious threat to the ecosystem. At the same time, the synthetic raw materials of traditional plastics all come from non-renewable fossil resources. Therefore, the research and development of biomass-based thermosetting / thermoplastic polymers that can replace traditional plastics has become an urgent work. [0003] At present, some biomass-based plastics have been developed and app...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L1/04
CPCC08J3/24C08J2301/04
Inventor 王小慧苏治平张伟金英华
Owner SOUTH CHINA UNIV OF TECH
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