Thermochromic composite material for intelligent window

[0016] Example 1: Preparation of cellulose-reinforced PNIPAM-based thermochromic windows

[0017] (1) with N, N ＇ -Bipropyl acrylamide is used as a crosslinking agent, ammonium persulfate is used as a catalyst, and PNIPAM is synthesized by soap-free emulsion polymerization; it is prepared into a PNIPAM aqueous dispersion;

[0018] (2) Prepare 0.04 g / mL CMC solution with a degree of substitution of 0.5 and a molecular weight of 90,000 g / mol;

[0019] (3) Mix the PNIPAM aqueous dispersion, CMC solution and water to obtain a CMC / PNIPAM thermochromic composite material with a mass fraction of CMC of 0.005% and a mass fraction of PNIPAM of 0.1%.

[0020] (4) Inject the CMC / PNIPAM thermochromic composite material into the double-layer glass with an interlayer thickness of 0.5mm, and seal it to obtain a thermochromic window.

[0021] The phase transition temperature of CMC / PNIPAM measured by differential scanning calorimetry is 32.3°C. At 32.3°C, the solar energy modulation

[0022] Example 2: Preparation of cellulose-reinforced PNIPAM-based thermochromic windows

[0023] (1) with N, N ＇ -Bipropyl acrylamide is used as a crosslinking agent, ammonium persulfate is used as a catalyst, and PNIPAM is synthesized by soap-free emulsion polymerization; it is prepared into a PNIPAM aqueous dispersion;

[0024] (2) Prepare a 0.04 g / mL CMC solution with a substitution degree of 1 and a molecular weight of 100,000 g / mol;

[0025] (3) The PNIPAM aqueous dispersion, CMC solution and water were mixed to obtain a CMC / PNIPAM thermochromic composite material with a mass fraction of CMC of 1.5% and a mass fraction of PNIPAM of 2.5%.

[0026] (4) Inject the CMC / PNIPAM thermochromic composite material into the double-layer glass with an interlayer thickness of 4.5 mm, and seal it to obtain a thermochromic window.

[0027] The phase transition temperature of CMC / PNIPAM measured by differential scanning calorimeter is 30.8°C. At 30.8°C, the solar energy modulat

[0028] Example 3: Preparation of cellulose-reinforced PNIPAM-based thermochromic windows

[0029] (1) with N, N ＇ -Bipropyl acrylamide is used as a crosslinking agent, ammonium persulfate is used as a catalyst, and PNIPAM is synthesized by soap-free emulsion polymerization; it is prepared into a PNIPAM aqueous dispersion;

[0030] (2) Prepare a 0.04 g / mL CMC solution with a degree of substitution of 1.5 and a molecular weight of 1,000,000 g / mol;

[0031] (3) The PNIPAM aqueous dispersion, CMC solution and water were mixed to obtain a CMC / PNIPAM thermochromic composite material with a mass fraction of CMC of 3% and a mass fraction of PNIPAM of 5%.

[0032] (4) Inject the CMC / PNIPAM thermochromic composite material into the double-layer glass with an interlayer thickness of 3 mm, and seal it to obtain a thermochromic window.

[0033] The phase transition temperature of CMC / PNIPAM measured by differential scanning calorimetry is 30°C. At 30°C, the solar energy modulation