A series of highly soluble maleimide-based polymers with photoreactive pendant group were synthesized and used as a gate dielectric insulator for organic thin film transistors. Photoalignment properties were characterized by UV-visible spectroscopy and the alignment of liquid crystals. Photopolymerization of polymer-coated organic thin film transistors with linearly polarized UV light induces anisotropy in field-effect mobility. The gate dielectric insulator based on the photoalignable maleimide shows higher field-effect mobility and on/off current ratio than those from a SiO 2 gate dielectric insulator with the values of 0.3 cm 2 V 21 s 21 and 10 4 , respectively. Our results demonstrate that the photo-induced anisotropy of alignment films to control the molecular order of semiconducting pentacene is a promising technology for improving the performance of organic thin film transistors.

No abstract

We investigated the polymerization of semifluorinated 1,6‐heptadiyne derivatives with MoCl5 as a catalyst in a supercritical carbon dioxide medium for the first time. The weight‐average molecular weight and polydispersity of the resulting polymers were in the ranges of 11.7–107.2 × 103 and 1.3–6.7, respectively. The 13C NMR spectrum of the polymers confirmed the five‐membered ring structure.

: High-rise buildings need thorough cost management because of large size and high risk. Cost management makes a budget by establishing and analyzing detail element at planning phase, needs cost control as each design phase, then reflected to next design. This research develops a schematic estimation model based on vertical and horizontal elements at design phase for structure cost of high-rise buildings to reduce error range and use data as design management. Usability of the model is confirmed by case study. The estimation model is expected to contribute to making the cost model more effective and satisfactory to concerned in construction or budget department and manage keeping track of the cost.