Grafting triphenylamine groups onto polysiloxanes to improve interaction between the electrochromic films and ITO

Color combination of polysiloxane polymer by introducing two different triphenylamine based pendent groups for electrochromism

“…From Figure , the dominant peak at 332 nm belongs to the π–π* transition of the conjugation between phenyl rings. According to our previous work, the peaks of P(PT‐TPA)Si and P(TB‐TPA)Si are at 335 and 314 nm, respectively. Thus, the wavelength of π–π* transition peak for P(PT‐TB‐TPA)Si is between that of the P(PT‐TPA)Si and P(TB‐TPA)Si which means that the result is subjected to both of the two monomers.…”

“… (a) The FTIR spectrum of the P(PT‐TB‐TPA)Si; (b) the 1 H‐NMR of two TPA containing alkenes, P(PT‐TB‐TPA)Si and PMHS. [Color figure can be viewed at http://wileyonlinelibrary.com]…”

“…The thermal property of the P(PT‐TB‐TPA)Si was investigated with thermogravimetric analysis (TGA) method and the data are shown in Figure . According to the TGA curve, the decomposition temperature defined as the 5% weight‐loss temperature is 356 °C, which is between the decomposition temperature of P(PT‐TPA)Si (341 °C) and P(TB‐TPA)Si (370 °C) . It is clear that the P(PT‐TB‐TPA)Si exhibits good thermal stability similar to the P(PT‐TPA)Si and P(TB‐TPA)Si since the polysiloxane backbone and bulky TPA are introduced into the polymer.…”

“…Organic solvents purchased from Sinopharm Chemical Reagent Co., Ltd., China have been distilled before use. Two TPA‐containing alkene monomers (PT‐TPAA and TB‐TPAA) were synthesized according to our previous work by the reaction of TPA derivatives and acryloyl chloride, and their structures are outlined in Scheme .…”

“…An alternative approach to achieve enhanced performance is to prepare a kind of hybrid polymers which is post functioned by TPA group to ameliorate inherent properties. According to our previous study, incorporation of polymethylhydrosiloxane (PMHS) could effectively enhance the thermal and cycling stability of electrochromic films. What's more, the films were nearly colorless in their natural state due to the introduction of PMHS backbones and thus could be potentially used in application of displays and smart windows …”