高分子 Vol.64 No.8
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特集 カタチの記憶
展望 COVER STORY: Highlight Reviews
Bio-Based Films Showing Double Shape-Memories by Thermal and Photonic Stimuli
金子 達雄
<要旨> 形状記憶材料の多重記憶性は、アクチュエータの分野で重要なトピックである。光機能性バイオ分子である桂皮酸類を主鎖に導入したポリエステルを設計し1)光メカニクス、2)高分岐鎖の物理架橋に基づく熱刺激型形状記憶、の二つの機能を組み合わせ、多様な形状を記憶できる形状記憶バイオベースフィルムを開発した。
Keywords: Cinnamoyl / Photomechanics / Shape Memory / Bioplastics / Isomerization / Polycondensation
Development of High Performance Shape Memory Composite Material
戸伏 壽昭
<要旨> 形状記憶合金と形状記憶ポリマーでは変形した形状が加熱で元の形状に戻る性質は類似しているが、高温と低温における両材料の剛性と強度特性は全く逆である。性質の異なる材料からなる複合材料を開発すると単体の材料では得られない新しい高機能を利用することができる。変態温度の異なる形状記憶合金と形状記憶ポリマーからなる形状記憶複合材料の開発を展望する。
Keywords: Shape Memory Alloy / Shape Memory Polymer / Composite / Shape Memory Composite / High Performance / Superelasticity
Shape Memory Mechanism in Polymers
猪股 克弘
Katsuhiro INOMATA
<要旨> 形状記憶高分子がカタチを記憶する挙動は、特殊なものではなく、ほとんどすべての高分子が本質的に有する特性である。その形状記憶メカニズムについて、高分子の基礎的物性である力学的性質や熱的性質などを踏まえ、わかりやすく解説する。また、複雑な形状記憶挙動を実現する最近の研究例を紹介する。
Keywords: Shape Memory Polymer / Mechanical Property / Thermal Property / Thermo-Plastics / Cross-Linked Rubber
トピックス COVER STORY: Topics and Products
Shape Stabilizing Finish “APOLLOCOT”
博田 浩明
Hiroaki HAKATA
<要旨> Form stability processing of clothes materials is processing to give high W&W characteristics to clothes such as cotton (W&W is the index that indicates whether we can wear the cloth immediately after washing). We succeeded in the development of a 100-percent-cotton shirt material “APOLLOCOT” that has a W&W 4.0 grade level. This product has a favorable reception because we realize that we can wear it ironing-free after washing. This report introduces the resin process and the liquid ammonia process that are the key technology of “APOLLOCOT”.
Keywords: Resin / Liquid Ammonia
Possibility for Replacing Superelastic Alloys (Shape-Memory Alloys) with Organic Compounds
髙見澤 聡
<要旨> The expected thermal shape recovery nature in organosuperelastic materials is described. Shape memory effect in organosuperelastic materials can cover the vacunt recovery-force range between those of conventional shape memory polymers (SMPs) and shape memory alloys (SMAs). The organosuperelasticity can provide a novel strategy for producing alternative sort of shape-memory materials to SMPs and SMAs.
Keywords: Organosuperelasticity
Temperature-Induced Transformable Nanoparticles
菊池 明彦・麻生 隆彬
Akihiko KIKUCHI, Taka-Aki ASOH
<要旨> We describe the preparation of thermoresponsive core-corona nanoparticles with well-defined thermoresponsive corona structures. Poly(N-isopropylacrylamide) (PNIPAAm) with a polydispersity index of as much as 1.15 was prepared by atom transfer radical polymerization, followed by end group functionalization to introduce vinyl groups, thus obtaining a PNIPAAm macromonomer. The latter macromonomer was then polymerized with styrene in an aqueous organic solvent to form core-corona type nanoparticles. Both PNIPAAm chain lengths as well as the feed content led to nanoparticle diameter changes, that were a decrease with increasing PNIPAAm chain lengths and an increasing amount of feed PNIPAAm content, respectively, so that the diameter of nanoparticles were in a range of 180-1000 nm with a narrow size distribution. By using poly(butyl methacrylate) (PBMA) as the core forming materials, the shape of nanoparticles can be altered from sphere to rod by uniaxial extention. Rod shaped nanoparticles have returned their original spherical shapes by incubating above the PBMA’s Tg values. Such characteristics may be useful for regulated interaction of nanoparticles with cells.
Keywords: Poly(N-isopropylacrylamide) / Core-Corona Type Nanoparticles / Atom Transfer Radical Polymerization / Suspension Polymerization / Transformable Nanoparticles / Glass Transition Temperature
グローイングポリマー Polymer Science and I: A Personal Account
Be a Treasure Hunter
佐光 貞樹
<要旨> “Research activity is like treasure hunting”, is a quote from my supervisor that was the starting point of my research career. Development of new materials for practical applications is really a tough challenge. This is a short story of how I gained scientific knowledge and learned new research techniques, and an account of what I want to become in the future.
高分子科学最近の進歩 Front-Line Polymer Science
Polymer Synthesis using CO2 as a Co-monomer
野崎 京子・中野 遼
<要旨> Carbon dioxide has attracted broad interest as a C1 feedstock, due to its abundance in nature, low price, low-toxicity, and renewability. In polymer synthesis, the use of carbon dioxide as a building block of polymeric materials has been investigated since the early 70s. To exploit the prospective nature of carbon dioxide as a C1 resource, availability of a cheap and mass-produced co-monomer is essential for further industrial application. We review recent efforts to utilize carbon dioxide as a co-monomer for polymerization. Along with a few industrialized copolymers such as urea resins and polycarbonates, various copolymers made from carbon dioxide are summarized.
Keywords: Carbon Dioxide / Copolymerization