主鎖にポリアクリル酸，側鎖として結晶性のオレフィンからなる感温性粘着剤の基礎物性および粘着付与剤による表面構造および内部構造に及ぼす影響について着目して実験を行った。精密構造解析により剥離性と表面構造との相関を明らかにした。その結果，粘着付与剤には，熱処理後の剥離性を向上させる役割があることを示した。一方，ナノメートルスケールの構造においては，側鎖のオレフィン部分に粘着付与剤が溶け込んでおり，粘着付与剤がナノ相分離構造の大きさや構造の間隔（構造周期） に影響を与えていることも示した。また，両面テープ製品に使われている粘着剤について剥離性と構造を評価し，作製時の乾燥プロセスに剥離性，表面構造が影響を受けていることを示した。

4,4’-ジヒドロキシビフェニル（DHBP）と4,4’- ジクロロジフェニルスルホン（DCPS）を反応させて水酸基を有するオリゴマーを得た後，エポキシ化反応を行うことにより新規なエーテルスルホン構造を有するビフェニル系エポキシ樹脂（DGES-BP） を合成した。これを用いてフェノールノボラックを硬化剤とした硬化物の物性を評価した結果，ガラス転移温度は 185.1℃とビフェノール型エポキシ樹脂（DGBP） に対して15.5℃，多官能性のビフェニルアラルキル型エポキシ樹脂（GBPAR） に対して 11.3℃高い値を示した。また，エーテルスルホン構造に起因して低熱膨張性と高い熱分解安定性が確認された。

Mosquitoes have a unique leg with highly water-repellent due to the fine geometrical structure of their surface. While the roughness of hydrophobic surfaces magnifies their non-wetting property with respect to water, it enhances their wettability with respect to hydrophobic liquids such as silicone oils. This high wettability induces strong attractive meniscus forces on a mosquito’s legs（up to 87％ of the mosquito’s weight）towards the liquids. We studied the landing behaviour of mosquitoes on oil-coated surfaces and observed that the mosquito contact time was reduced compared to that on hydrophilic-liquid-coated surfaces. The observed escape behaviour occurred consistently with several hydrophobic liquids. As the repellent effect is similar to multiple hydrophobic substances, it is likely to be mechanically stimulated owing to the physical properties of the hydrophobic liquids and not due to chemical interactions. On human skin, the contact time was sufficiently short to prevent mosquitoes from starting to blood-feed. This wetting-based method of repellent opens up opportunities in the design of safer, more effective products.

In this review article, the recent progress in the synthesis and application of network polymers is described. The synthesis of network polymers is inextricably linked with material design for the control of physical and mechanical properties. In this article, therefore, we focused on the following topics; the classification of network polymers, the synthesis and properties of thermosetting resins including epoxy resins, phenolic resins, benzoxazine resins, cyanate resins, and maleimide resins, the toughening of network polymers using reversible networks and physical cross-linking, polymer blending, spatial entanglement, and co-continuous network polymer design, concept and application of dynamic covalent bond chemistry, and the highperformance network polymers, e.g. semiconductor encapsulation, 5G/6G compatible materials, thermal and photo-responsive reversible adhesives, on-demand debonding adhesion systems, self-healing/shape-memory elastomers, porous polymer materials and dissimilar materials bonding, and functional polymer gels.