Abstract
A series of novel polyimidothioethers (PITEs) and the respective polymer hybrids of titania or zirconia with fantastic thermal stability and optical properties have been successfully prepared. These colorless PITEs with high transparency were synthesized by Michael polyaddition from commercially available dithiol and bismaleimides monomers. The PITE with sulfide and hydroxyl groups (S-OH) and the corresponding hybrid films declare ultra-lowest birefringence value of 0.002 and tunable refractive index (1.65–1.81 for S-OH/titania and 1.65–1.80 for S-OH/zirconia), implying large potential to the optical applications in the future. Moreover, the S-OH/zirconia hybrid films exhibit higher Abbe’s number and optical transparency than those of S-OH/titania system because larger energy band gap of ZrO2. Furthermore, by adding titania and zirconia as electron acceptor into S-OH system, the charge transfer complex can be facilitated and stabilized caused by the lower LUMO energy level of hybrid materials. Consequently, the devices of memory prepared from these polymer films of hybrid showed interesting and adjustable memory behavior from DRAM, SRAM, to WORM at various titania or zirconia contents with a large ON/OFF ratio (108), denoting that the memory devices derived from these highly transparent novel S-OH/TiO2 and S-OH/ZrO2 hybrid films are attractive for the electrical applications.
Highlights
It is well known that the highly transparent thermoplastic polyimidothioethers (PITEs) prepared from bismaleimides (BMIs) via Michael polyaddition exhibited attractive optical and thermal characteristics, making them greatly suitable for advanced composites and electronics, and have positive value to be used in electrical applications[11]
The highly transparent PITEs with pendant hydroxyl groups were prepared in this study; the memory behavior and optical properties such as transparency, Vd, and RI of the resulted flexible PITEs/TiO2 or ZrO2 hybrid films are investigated in this study
These PITEs could be readily obtained by the Michael polyaddition of commercially available dithiol DT–OH with bismaleimides, and the reaction was fulfilled with basic TEA as catalyst in m-cresol at 25 °C for 4 h (Fig. 1)
Summary
It is well known that the highly transparent thermoplastic polyimidothioethers (PITEs) prepared from bismaleimides (BMIs) via Michael polyaddition exhibited attractive optical and thermal characteristics, making them greatly suitable for advanced composites and electronics, and have positive value to be used in electrical applications[11]. By introducing inorganic materials TiO223 or PCBM33 as the strong acceptor of electron into the PI system, the obtained memory devices manifested attractive behaviors of memory because of the lower LUMO energy level that would facilitate and stabilize the CT, resulting in tunable memory retention time. These PI hybrid films of TiO2 or ZrO2 could avoid the disability of decreasing ON/OFF ratio at higher TiO2 or ZrO2 contents at the hands of the depressed conductivity in the OFF state. The highly transparent PITEs with pendant hydroxyl groups were prepared in this study; the memory behavior and optical properties such as transparency, Vd, and RI of the resulted flexible PITEs/TiO2 or ZrO2 hybrid films are investigated in this study
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