導電エポキシ接着剤組成中の銀（Ag）フィラー量低減を目的とし，エポキシ / ブロックコポリマーブレンドとin-situ形成銀フィラーからなる複合化ペーストを調製した。まず，ポリメチルメタクリレート（PMMA）-b-ポリ n ブチルアクリレート（PnBA）-b-PMMA トリブロックコポリマーを液状アミン系硬化剤中に加熱溶解させた。一方で，少量のアルキルアミン共存下で炭酸銀を加熱還元してAg ナノフィラースラリーを得た。両者をエポキシ樹脂とブレンドし溶媒を除去して導電性エポキシ複合ペーストを得た。硬化後の複合材の電子顕微鏡観察から，樹脂中には厚さ数十ナノメートルサイズの共連続相構造が形成され，アルキルアミン被覆Ag ナノフィラーはPnBA 連続相に選択配置したことがわかった。結果，5vol% という低Ag フィラー含有率の複合組成で導電性が発現した。エポキシ/ アミン反応物，PnBA，アルキルアミン被覆Ag フィラーのハンセン溶解度パラメータ（HSP）を測定し，Agフィラーの選択配置機構を成分間の親和性から考察した。

第二世代アクリル系接着剤（ SGA）は，破壊試験時に凝集破壊を示すため結合力モデルなどの応力解析への適合性が高い。解析条件をより適切に設定していくためには，材料の破壊過程の正確な把握が重要である。本研究では，スカーフ角度0°，30°，60°，90°を対象にして強度試験途中のアコースティックエミッション（AE）およびひずみ分布測定，破断面の走査型電子顕微鏡（SEM）での観察を実施した。微視観察の結果，すべてのスカーフ角度において，まずアクリルリッチ相に接着面と平行にクラックが発生し，その後エラストマーリッチ相へクラックが進展することがわかった。スカーフ角度が大きくなるにつれてエラストマーリッチ相のせん断による塑性変形が大きくなった。高いエネルギーのAEシグナルの発生はスカーフ角度0°，30°で多く，60°，90°で少なかったが，アクリルリッチ相のクラックに対応することが示唆された。スカーフ角度30°と60°の間で破面，AE 発生状況，ひずみ分布が大きく変化し，破壊モードが引張支配型からせん断支配型へ変化することがわかった。

The creation of antifouling materials is required in various fields such as the environment, energy, and medicine. In particular, biocompatible materials that do not adsorb biological components or induce biological reactions are indispensable to ensure the performance and safety of medical devices during treatments. Biomimetic science, which mimics the structure and molecular functions of living organisms, has produced highly functional materials. It has been realized a polymer that does not induce biological fouling by molecular design mimics the structure of cell membranes. A polymer that possesses a representative phospholipid polar group, phosphorylcholine group, 2-methacryloyloxyethyl phosphorylcholine（MPC）polymer is one of the excellent examples. The interface between the MPC polymer surface and the aqueous phase has a characteristic water structure that can inhibit the formation of protein adsorption layers and cell adhesion. This is due to a phosphorylcholine group in the MPC polymer. The MPC polymer has been widely used as a surface treatment material for medical devices worldwide. Moreover, biomimetic chemistry using the catechol group is also described to bind the MPC polymer to the surface of medical devices in a stable and simple process.

This review article deals with ring-opening polymerization, selecting fundamental chemistry as well as recent topics. In addition to usual thermodynamics, where the ring-strain is released to drive the polymerization by providing the enthalpy, an entropy-driven system is presented for macrocyclic monomers. In a recent trend, efficient monomer recovery through the depolymerization is achieved by reducing the ceiling temperature with the aid of a solvent and a catalyst. Lactone, thiolactone, and cyclic carbonate monomers are explored for such purpose. The propagation mechanisms of ionic ring-opening polymerizations are discussed in terms of electrophilic and nucleophilic characters. The propagation takes place between an ionic chain end and a neutral monomer or between a neutral chain end and an ionic monomer. The former is a usual manner termed as an active chain-end mechanism, while the latter is an activated monomer mechanism, which can rather perform a living fashion. There is additionally a system involving the propagation reaction between a neutral chain end and a neutral monomer. Cyclic polymers are efficiently prepared from lactide, lactone, and NCA by the cyclization between the cationic initiation terminal and the anionic propagation terminal. Radical ring-opening polymerization is revived due to giving degradable functional groups such as ester and thioester to vinyl polymer main chains by the copolymerization. Therein, thionolactone is newly employed in addition to a classical monomer of cyclic ketene acetal. Ring-opening metathesis polymerization of cyclic olefines, showing living characters, is a powerful tool for not only basic research but also industrial production.