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Preparation method of photo-crosslinking polyvinyl alcohol/cellulose nanocrystal (PVA/CNC) composite film

A technology of nanocrystalline cellulose and polyvinyl alcohol, which is applied in the field of polymer materials and photosensitive materials, can solve problems such as toxicity or difficult control of reactions, and achieve good physical and chemical stability, strong polarity, and high temperature resistance to permeation flux. Effect

Active Publication Date: 2015-04-08
深圳市大亚洲电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used modifiers include aldehydes, boric acid, urea, organosilicon groups, etc., but these modifiers are either toxic or the reaction is difficult to control

Method used

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  • Preparation method of photo-crosslinking polyvinyl alcohol/cellulose nanocrystal (PVA/CNC) composite film
  • Preparation method of photo-crosslinking polyvinyl alcohol/cellulose nanocrystal (PVA/CNC) composite film
  • Preparation method of photo-crosslinking polyvinyl alcohol/cellulose nanocrystal (PVA/CNC) composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of PVA / CNC mixed solution: Dissolve 5g of CNC in 95mL of deionized water, prepare a suspension with a mass fraction of 1%, disperse twice with an ultrasonic cell pulverizer at a power of 25w, 60 times each time, Each step is 5 seconds, and the interval is 5 seconds to obtain a well-dispersed CNC suspension; then dissolve 3g of PVA in 34.5mL of deionized water, heat and stir at 90°C for 40min in a collector-type magnetic heating stirrer, and then Add 0.05 g of 1% CNC suspension, continue heating and stirring at 90° C. in an oil bath for 1 h to obtain a PVA / CNC mixed solution.

[0021] (2) Preparation of PVA / CNC composite film: After cooling the PVA / CNC mixed solution to room temperature, put it on a temperature-controlled magnetic stirrer, add 0.1222mL photocrosslinking agent HEMA (hydroxyethyl methacrylate) and 0.098g of photoinitiator 2959 (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylbenzene) was stirred for 2 hours in the shade; The film was dried at 38° C...

Embodiment 2

[0024] (1) Preparation of PVA / CNC mixed solution: Dissolve 5g of CNC in 95mL of deionized water, prepare a suspension with a mass fraction of 1%, disperse twice with an ultrasonic cell pulverizer at a power of 25w, 60 times each time, Each step is 5 seconds, and the interval is 5 seconds to obtain a well-dispersed CNC suspension; then dissolve 3g of PVA in 34.5mL of deionized water, heat and stir at 90°C for 40min in a collector-type magnetic heating stirrer, and then Add 0.05 g of 1% CNC suspension, continue heating and stirring at 90° C. in an oil bath for 1 h to obtain a PVA / CNC mixed solution.

[0025] (2) Preparation of photocrosslinking PVA / CNC mixed solution: After cooling the PVA / CNC mixed solution to room temperature, put it on a temperature-controlled magnetic stirrer, add 0.1222mL photocrosslinking agent HEMA (hydroxyethyl methacrylate Esters) and 0.098g photoinitiator 2959 (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylbenzene) were stirred for 2h in shading, and then the...

Embodiment 3

[0028] Thermogravimetric Analyzer (TGA) is used in TGA / 1100SF under nitrogen atmosphere with a heating rate of 15°C / min, and the temperature range is 25-600°C. The film (b) and the PVA-modified photocrosslinked composite film (c) were tested, and about 8-10 mg was used for each sample. Obtain the thermogravimetric graph (2) and DTG diagram (3) of the composite film etc.

[0029]It can be seen from Figure (2) that the initial decomposition temperatures of pure PVA film, PVA modified non-crosslinked composite film and PVA modified photocrosslinked composite film are 230°C, 240°C, and 235°C, respectively. As the temperature increased, the residual mass was 6.4% at 600°C. It can be seen from Figure (3) that pure PVA, PVA modified non-crosslinked composite film and PVA modified photocrosslinked composite film all slowly decompose and lose weight. PVA has an obvious weight loss peak near 260 ° C. The uncrosslinked composite film has a weight loss peak at 270 °C, and the PVA modifi...

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Abstract

The invention relates to a preparation method of a photo-crosslinking polyvinyl alcohol / cellulose nanocrystal (PVA / CNC) composite film and belongs to the fields of high molecular materials and photosensitive materials. The preparation method of photo-crosslinking PVA / CNC composite film comprises the following steps: firstly, adding a natural high molecular CNC, crosslinking the CNC with PVA through a hydrogen bond, then adding a carbon-carbon double bond and hydroxyl containing hydroxyethyl methylacrylate (HEMA) molecule, enabling hydrogen bonds of HEMA and PVA to interact, and carrying out polymerization reaction on HEMA and PVA at the same time under the irradiation of ultraviolet light to obtain the photo-crosslinking PVA / CNC composite film. The photo-crosslinked PVA / CNC composite film has excellent water resistance, mechanical properties and thermal stability and can be applied to the filed of biodegradable packaging materials.

Description

technical field [0001] The invention relates to a method for preparing a photocrosslinked polyvinyl alcohol / nanocrystalline cellulose PVA / CNC composite film, in particular to a water-resistant photocurable composite material obtained by adding a photocrosslinking agent, and belongs to the field of polymer materials and photosensitive materials. Background technique [0002] Water-soluble polyvinyl alcohol (PVA), which is obtained by hydrolysis of polyvinyl acetate, has the structural formula -CH 2 CH(OH) n -It is a high molecular polymer with hydroxyl groups. The main chain of the PVA molecule is a carbon chain, and each repeating unit contains a hydroxyl group. Due to the small size and strong polarity of the hydroxyl group, it is easy to form hydrogen bonds. Its chemical properties are stable and have sufficient thermal stability, high hydrophilicity and water solubility. ; At the same time, it also has good film-forming properties and adhesion, excellent resistance to g...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/28C08J3/24C08J7/00C08L29/04C08L1/02C08K5/101B29C35/08
Inventor 白绘宇李育飞姜松刘晓亚
Owner 深圳市大亚洲电子材料有限公司
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