ナノフィラーは炭素繊維強化複合材料のマトリックス樹脂の強靭化，耐疲労特性改善に期待されている。本研究では，カーボンナノチューブを添加したエポキシ樹脂について，疲労き裂伝ぱ特性を調べた。カーボンナノチューブは機械的混錬により凝集体のない状態まで分散させた。また，カーボンブラックを用いてフィラーの形状が疲労き裂伝ぱ特性に及ぼす影響を調べた。破壊靭性を評価した結果，カーボンナノチューブを添加することにより約40％増加したが，過度の添加は靭性向上効果を低下させた。また，カーボンナノチューブは疲労き裂伝ぱ抵抗を高くする効果がみられ，カーボンブラック添加系よりも効果が高いことがわかった。いずれのナノフィラーも，き裂先端での界面剥離を起因とする塑性変形による破壊エネルギー増大が疲労き裂伝ぱ抵抗を増加させたことがわかった。カーボンナノチューブは長さによる効果により塑性変形サイズが大きく拡がり，疲労き裂伝ぱ抵抗向上により高い効果があることがわかった。

This paper reviews research focusing on how organisms form shapes of adhesive attachment, and introduced efforts in developmental biomimetics. As an example, gecko’s feet, leaf beetle’s feet, the process of forming byssus of mussels, the process of growing setae in the pupa of fruit-flies Drosophila melanogaster, and the biomimetic technology developed by modeling the biological method were introduced.

This article reviews epoxy resin formulations used for the fabrication via Stereolithography（SL） method. The basic concept of the SL method utilizing photocurable resins was come up with first by a Japanese researcher, Hideo Kodama, who applied the Japanese patent in 1980. The following year, his invention was open to public in a US scientific journal “Review of Scientific Instruments”. Kodama’s patent application was performed several years earlier than the US patent of C.W. Hull known as a leading player in popularizing the SL method and 3D printing apparatuses worldwide. The epoxy resin system widely used for 3D printing is the epoxy/acrylate hybrid formulation which was first applied for patent by a Japanese company in 1988. The epoxy/acrylate simultaneous photo curing system is considered to build up Interpenetrating Polymer Network （IPN），so-called Simultaneous-IPN（SIN）．The photo curing SIN system has been examined by many researchers, and the curing mechanism is being gradually clear along with the advantages and disadvantages of the SIN system. Another IPN system, Sequential-IPN（SIPN），which is built up typically from the thermalcuring epoxy and the photo-curing acrylate components through two-stage curing, is under study to apply for 3D printing. The purpose of utilizing SIPN system is to improve mechanical properties of the 3D objects formed.

This article describes the latest advances in cationic polymerization of vinyl monomers, focusing on SDGsconscious catalyst development. Many cationic polymerization reactions are catalyzed by metal Lewis acids, which can be toxic and/or have a negative impact on the environment. In addition, some of the metals that consist of catalysts for cationic polymerization and other chemical reaction are depletable. Thus, a recent focus of cationic polymerization is the development of metal-free catalyst systems, including polymerization via a RAFT mechanism without a metal-containing catalyst; photoinitiated polymerization systems; and polymerization reactions using organocatalysts. For the development new material without excess exploitation of fossil resources, other important topics of attention would be stereoselective or stereospecific polymerization of commonly used monomers that would provide higher performance polymers, and polymer synthesis from bio-based monomers.