Flexible-spacer-free side chain liquid crystal polymer composite shaped phase-change material and preparation method thereof
A technology of shape-setting phase change materials and liquid crystal polymers, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of limiting the practical application of side chain liquid crystal polymers, high production costs, and complicated synthesis steps of side chain liquid crystal polymers etc., to achieve the effects of easy control of preparation conditions, low production cost, and good reprocessing properties
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Embodiment 1
[0036] Monomer 4'-octadecyloxy-4-biphenol methacrylate (MBi-18) (0.506g, 10 -3 mol), initiator azobisisobutyronitrile (1.64mg, 10 -5 mol), the solvent chlorobenzene (1.181g) was added to a clean glass test tube equipped with a small magnet, and after three times of liquid nitrogen freezing and vacuum circulation, after nitrogen treatment, the tube was sealed under vacuum, and then the polymerization tube was placed at 75°C Constant temperature oil bath, react for 10h, put the test tube into ice water bath, cool down, stop the reaction. Then dilute the reaction system with 3 to 5 times the volume of tetrahydrofuran solvent, and then add dropwise to 300 mL of acetone under vigorous stirring, precipitate, centrifuge, and vacuum dry for 12 hours to obtain the desired polymer poly-4'-octadecane Oxy-4-biphenol methacrylate (PMBi-18), molecular weight 7.47×10 4 . Its structural formula is:
[0037]
[0038] Take 4g of solid paraffin wax with a melting point of 56-58°C and a ph...
Embodiment 2
[0041] The side chain liquid crystal polymer poly 4'-hexadecyloxy-4-methacrylic acid biphenolate (PMBi-16) is obtained in the same way as example 1, and the molecular weight is 8.82 * 10 4 . Its structural formula is:
[0042]
[0043] Take 4g of solid paraffin wax with a melting point of 56-58°C and a phase change enthalpy of 189.3J / g, melt it in a 25mm×40mm sample bottle, add PMBi-16 to make it 6% by mass, heat and stir until completely dissolved, and wait After the mixture is clarified, it is naturally cooled to prepare a side-chain liquid crystal polymer composite shape-changing material.
[0044] The phase change enthalpy of the phase change material obtained in this example is 191.0 J / g, the phase change temperature is 57.48° C., and the gel disassociation temperature of the phase change gel is 150° C. through differential scanning calorimetry (DSC). The gel-sol temperature was 154°C.
Embodiment 3
[0046] The side chain liquid crystal polymer poly 4'-tetradecyloxy-4-methacrylic acid biphenolate (PMBi-14) is obtained by the same method as example 1, and the molecular weight is 8.41 * 10 4 . Its structural formula is:
[0047]
[0048] Take 4g of solid paraffin wax with a melting point of 56-58°C and a phase change enthalpy of 189.3J / g, melt it in a 25mm×40mm sample bottle, add PMBi-14 to make it 6% by mass, heat and stir until completely dissolved, and wait After the mixture is clarified, it is naturally cooled to prepare a side-chain liquid crystal polymer composite shape-changing material.
[0049] The phase change enthalpy of the phase change material obtained in this example is 183.9 J / g, the phase change temperature is 57.19° C., and the gel disassociation temperature of the phase change gel is 162° C. by differential scanning calorimetry (DSC). The gel-sol temperature was 165°C.
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