Co-polymers
A technology of copolymers and monomers, applied in the field of copolymers, can solve problems such as reducing conductivity and damaging the performance of electrochromic layers
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Embodiment 1
[0194] Considering the three properties that the material must have, namely, soluble in organic solvents in the presence of MWCNTs, easy to deposit on surfaces and the resulting films on PET-ITO to be as colorless as possible, the copolymer was designed a priori Synthesis of 1. In order to meet the first requirement, the main monomer contains two alkyl chains in the third and fourth positions of the thiophene ring, which can ensure good solubility in organic solvents, while the second monomer, the EDOT unit and the pyrene moiety chemical bonding. The latter is known to form strong π–π interactions with MWCNTs, hypothesizing to induce blending of copolymer 1 in carbonaceous materials. Using commercially available 3-4 dimethoxythiophene, in a catalytic amount of p-toluenesulfonic acid and the tertiary alcohol 2-ethylhexanol 1 It was poured into toluene at a temperature of 110 °C for 24 h in the presence, and the synthesis of monomer 2 was achieved in good yield. Other monomer...
Embodiment 2
[0196] Although the obtained Copolymer 1 is soluble in most common organic solvents, there are still problems in obtaining and obtaining a smooth and uniform film due to the poor dispersion of carbon nanostructures (Liu C.X., Choi J.W.; Nanomaterials, 2012, 2, 329-347). The challenge of good blends of MWCNTs (required for future applications). We measured the solvent contact angle of the PET surface after treatment in an organic solvent to allow the smoothest spread of the ink on the surface (see Table 1). Use toluene / CHCl3 (1:5, v / v) achieved an optimal solvent mixture, where the measured contact angle was only 8°. Based on this value, we optimized the blend as follows: In a flat-bottomed vial measuring 2 x 6.5 cm, add 10 mg of Copolymer 1, 10 mL of CHCl 3 Add 5 mL in two portions, sonicate (10 min at 45 °C) after each addition; almost all of the copolymer is dispersed in CHCl 3 middle. Pristine MWCNTs were added in 0.25 mg portions to check the limit of dispersibility in ...
Embodiment 3
[0198] Due to the versatility of the solutions containing the blends and the size of the MWCNTs, spray coating was chosen as the technique for coating solutions with or without MWCNTs on PET-ITO and / or PET. To accelerate solvent evaporation, the surface was placed on a hot plate at 40 °C, allowing us to perform a systematic study of the optimal conditions for optimal devices. Figure 4 Schematic illustrating the coating on a PET surface. The amount of MWCNTs used for the blend and the number of layers coated in the surface are the main variables considered during the system study, while the applied current in the device is the third one considered at inspection and analyzed after device assembly. variables.
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