Polymer material and its preparation method and touch panel
A technology of polymer material and weight average molecular weight, applied in the application field of touch panel, can solve the problem of poor temperature coefficient of resistance, etc., and achieve the effect of improving the insufficient temperature coefficient of resistance
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[0018] An embodiment of the present invention provides a method for preparing a polymer. First, N-(R) acrylamide and 4-styrenesulfonate (SS) were copolymerized by free radical polymerization mechanism to form polymer 1, as shown in formula 1.
[0019]
[0020] In Formula 1, R is a linear, branched, or cyclic (with low steric hindrance) C1-12 alkyl or C1-12 alkoxy group. For example, R can be methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-pentyl, isopentyl, neopentyl, lauryl, or the above Derivatives of In addition, R may be methoxy, ethoxy, propoxy, isopentyloxy, or derivatives thereof. M can be a monovalent metal ion such as sodium ion or potassium ion. The ratio between the repeated number of monomers m and n (ie the molar ratio of N-(R) acrylamide to SS) is between 0.01:1 and 1.2:1 (0.01:1≦m / n≦1.2: 1), and the weight average molecular weight of the polymer 1 is between 14,000 and 500,000. In addition, the initiator used in radical polymerization can...
Embodiment 1
[0031]NIP and EDOT were purified by vacuum distillation. 4-Styrenesulfonate sodium salt (SS) was purified by alumina column. After the reaction vial was evacuated, nitrogen gas was poured into / out of the vial several times. Then, the purified NIP (0.0025 mole), the purified SS (0.025 mole), and 100 mL of deionized water were added into the reaction flask. Afterwards, based on the total weight of NIP and SS, 1wt% potassium persulfate was added to the reaction flask. After the above mixture was fully stirred, it was heated to 85° C. under nitrogen and reacted at 85° C. for 24 hours, and then cooled to room temperature. The crude product after cooling was first dialyzed through a dialysis catheter for 4 hours to remove compounds with a weight average molecular weight less than 14,000, and obtain a polymer solution of SS and NIP. The IR spectrum of the polymer of SS and NIP is shown in Figure 2. Figure 3 shows the comparison of the IR spectra of polymers of SS and NIP, monomer...
Embodiment 2
[0034] The manufacturing process of Example 2 is similar to that of Example 1, except that the molar ratio of the starting materials (NIP / SS / EDOT) in Example 2 is changed from 0.1:1:1 to 0.01:1:1. Compared with Example 1, the molar ratio of SS / EDOT in Example 2 was fixed at 1:1, while the molar ratio of NIP / SS was changed from 0.1:1 to 0.01:1. The average temperature coefficient of resistance of the film formed from the polymer material prepared in Example 2 is -0.36% / °C between -30°C and 70°C, as shown in Figure 5.
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