Preparation method of N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel and product thereof

A technology of isopropylacrylamide and composite hydrogel, which is applied in the preparation of N-isopropylacrylamide polymer/polyvinyl alcohol composite hydrogel and its product field, can solve the problem of unsuitable energy-saving glass doors, windows, and shapes. Instability, poor mechanical properties and other problems, to reduce lighting and heating energy consumption, stable properties, easy to operate

Inactive Publication Date: 2009-12-23
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, N-isopropylacrylamide polymer hydrogel is a viscous aqueous solution, unstable in shape, easy to leak,

Method used

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  • Preparation method of N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel and product thereof
  • Preparation method of N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel and product thereof
  • Preparation method of N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the preparation of poly-N-isopropylacrylamide / polyvinyl alcohol composite hydrogel

[0021] Dilute 5mL of glutaraldehyde with water to make a solution with a volume fraction of 5%; dilute 20mL of methanol with water to make a solution with a volume fraction of 50%; dilute 2mL of glacial acetic acid with water to make a solution with a volume fraction of 10% ; Dilute 2 mL of concentrated sulfuric acid with water to make a solution with a volume fraction of 20%; mix the above four solutions evenly to obtain an organic crosslinking agent;

[0022] Mix 10 g of 1% poly(N-isopropylacrylamide) aqueous solution with 10 g of 10% polyvinyl alcohol 1799 (average degree of polymerization: 1750±50) aqueous solution and add dropwise 0.5 g of organic cross-linking agent, stirred evenly, and left to stand for 24 hours to obtain poly-N-isopropylacrylamide / polyvinyl alcohol composite hydrogel.

[0023] After testing, the LCST of the obtained composite hydrogel was 33.2°C; ...

Embodiment 2

[0024] Embodiment 2, the preparation of poly(N-isopropylacrylamide-methyl acrylate) / polyvinyl alcohol composite hydrogel

[0025] According to the method described in Example 1, poly(N-isopropylacrylamide-methyl acrylate) is used to replace poly-N-isopropylacrylamide to obtain poly(N-isopropylacrylamide-methyl acrylate) / Polyvinyl alcohol composite hydrogel.

[0026] After testing, the LCST of the composite hydrogel prepared from poly(N-isopropylacrylamide-methyl acrylate) with different monomer mass ratios is shown in Table 1; the composite hydrogel film with a thickness of 1mm, The difference in visible light transmittance between the transparent state and the white turbid state is shown in Table 1.

[0027] Table 1. Properties of composite hydrogels prepared from poly(N-isopropylacrylamide-methyl acrylate) with different monomer mass ratios

[0028]

Embodiment 3

[0029] Embodiment 3, the preparation of poly(N-isopropylacrylamide-ethyl acrylate) / polyvinyl alcohol composite hydrogel

[0030] According to the method described in Example 1, poly(N-isopropylacrylamide-ethyl acrylate) was substituted for poly-N-isopropylacrylamide to obtain poly(N-isopropylacrylamide-ethyl acrylate) / Polyvinyl alcohol composite hydrogel.

[0031] After testing, the LCST of the composite hydrogel prepared from poly(N-isopropylacrylamide-ethyl acrylate) with different monomer mass ratios is shown in Table 2; the composite hydrogel film with a thickness of 1mm, The difference in visible light transmittance between the transparent state and the white turbid state is shown in Table 2.

[0032] Table 2. Properties of composite hydrogels prepared from poly(N-isopropylacrylamide-ethyl acrylate) with different monomer mass ratios

[0033]

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Abstract

The invention discloses a preparation method of N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel and a product thereof. The preparation method comprises the following steps: evenly mixing N-isopropyl acrylamide polymer solution having mass fraction of 0.5-1.5% with polyvinyl alcohol solution having mass fraction of 5-20% according to a mass ratio of 0.5-1.5:1, then slowly adding a crosslinking agent which is equivalent to 1-5% of the mass of the mixed liquor obtained, evenly stirring, and keeping standing for 8-24 hours to obtain the N-isopropyl acrylamide polymer/polyvinyl alcohol composite hydrogel. The N-isopropyl acrylamide polymer is a homopolymer of N-isopropyl acrylamide or a copolymer of the N-isopropyl acrylamide and acrylic ester or methacrylate. The preparation method is characterized by simple operation and low cost, and the obtained product is characterized by good temperature sensitivity, stable morphology, not easy leakage and better mechanical property, and has wide application prospect in the intelligent light-control energy-saving material field.

Description

technical field [0001] The present invention relates to a preparation method of temperature-sensitive hydrogel and the product thereof, in particular to a preparation method of N-isopropylacrylamide polymer / polyvinyl alcohol composite hydrogel and the product thereof . Background technique [0002] Building energy saving is not only an economic issue to reduce energy consumption, but also an important strategic issue for the sustainable development of human beings. 95% of my country's existing buildings are high-energy-consuming buildings, and building energy consumption accounts for more than 27% of the country's total energy consumption, ranking first in all types of energy consumption. The unit building energy consumption is three times that of developed countries under the same climate conditions. Therefore, it is urgent to fully promote building energy conservation. [0003] Among the four enclosure components of doors, windows, walls, roof, and ground that affect bui...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L33/24C08L29/04C08K3/38C08K13/02C08K5/05C08K5/07C08K5/09C08K3/30C08K5/138
Inventor 傅相锴丁萍萍刘素娟傅宏
Owner SOUTHWEST UNIVERSITY
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