高分子 Vol.72 No.4
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特集 新しいモノづくり
展望 COVER STORY: Highlight Reviews
Architected Materialを用いた3D製造技術
Expansion of Expression Space of 3D Printer Using Architected Materials and its Application to Manufacturing
森田 淳
<要旨> 3Dプリンタを活用したモノづくりについて、最終製品を視野に入れた場合、形状だけでなく従来の高分子材料が表現してきた材料特性の自由度を確保することが重要である。本報では、Architected Materialを用いた設計空間の拡張を試みた。「単位構造によるマクロ3D形状の物性制御技術」と「エンドユーザの感性をデジタル設計に取り込む技術」に関する取組みを示す。
Keywords: 3D / Architected Material / Metamaterials / Design System / Personal Fabrication / Additive Manufacturing / Lattice / Foam
Nanoimprint Processes and Materials for Meta-Optics
中川 勝
<要旨> メタマテリアルの一種であるメタレンズや分波フィルターなどの薄型平板光学素子の登場で、撮像素子の革新的な高性能化が進んでいる。当初は半導体技術により高屈折率の無機材料から作られていたが、屈折率1.9を超える成形可能な材料が登場し始め、型成形に基づく研究が進んでいる。光学特性・成形性・量産性を備えた革新材料が求められている。
Keywords: Optical Metamaterials / Metaoptics / Metalense / Thin Flat Optical Element / High Refractive Index / Nanofabirication / Nanoimprinting / Nanoparticle Composite
Binder Jetting Technology for Metal Parts Manufacuturing
佐藤 慎一郎
Shinichiro SATO
<要旨> デジタルデータを活用した新しいモノづくりの手法として、アディティブマニュファクチャリングがある。中でもインクジェットを活用した金属積層造形法は、従来の金属3Dプリンタに比べて大量生産に適した造形法として期待されている。本稿では、インクジェットによる金属積層造形について、学術的な課題解決への取り組みや、最近の取り組み事例を紹介する。
Keywords: Additive Manufacturing / Binder-Jetting Technology for Metal / Aluminum
Concept of Topology Optimization and Its Applicaton to Structural Designs
西脇 眞二
<要旨> トポロジー最適化は、対象構造の外形形状と形態の変化を可能とする最も自由度の高い構造最適化の方法で、対象構造の大幅な性能向上を達成できる。本稿では、トポロジー最適化の基本的な方法論を説明するとともに、構造問題、流体問題、さらにはマルチフィジックス問題の例として、熱・流体問題への展開事例を示す。
Keywords: Structural Optimization / Topology Optimization / Computer Aided Engineerig / Finite Element Method
トピックス COVER STORY: Topics and Products
Additive Manufacturingによる柔らかさのデザイン
Designing Softness Using Additive Manufacturing Technology
村松 充
<要旨> The Additive Manufacturing (AM) technology enables making complex mechanical structures and it expands the possibilities in manufacturing. The author and the Prototyping & Design Laboratory at the University of Tokyo are exploring the possibilities of AM technology and creating prototypes that can be only made by AM. In this article, the author introduces several research projects exploring AM technology mainly focusing on the design of texture and tactile sensation made by complex structure. In product design, the parts that the user touches and holds are oftenly designed to be soft or elastic by using materials like elastomers. “Structured Texture” is a project designing texture and tactile sensation using complex milimeter-scale structures so called mechanical metamaterial. Researcher designed a Lizard model using Structured Texture which gives us a feeling as if we hold a real lizard. Later in the article, the author introduces recent studies exploring the possibility of designing wearable systems using AM and mechanical metamaterial.
Keywords: Additive Manufacturinig / Design / Prototyping / Texture / Mechanical Metamaterial / Wearable Systems
Preparation of Three Dimensional Products Using Flow Deformability of Wood Treated by Chemical Modification
阿部 充・関 雅子・三木 恒久
Mitsuru ABE, Masako SEKI, Tsunehisa MIKI
<要旨> Converting wood into thermoplastic materials is an attractive methods of increasing its utilization because complex three-dimensional molded products can easily be obtained by press molding. Esterification is a promising method for imparting thermoplasticity into wood. Hydroxyl groups in block-shaped wood were replaced with ester groups to realize plastic formation. The modulus of elasticity of the esterified wood decreased remarkably when heated. Additionally, the esterified wood was stretched extensively by pressing with heat, showing its fluidity. In addition, it was found that the deformability of wood can be controlled by the appropriate selection of an esterification method and its treatment conditions even in the case of similar degree of substitution with the same ester groups. Plastic formation using propionylated wood was attempted, and a cup-shaped three-dimensional product was successfully formed. The cup-shaped molded product exhibited high water resistance. Re-forming was also successfully demonstrated using crushed fragments of the cup-shaped molded product.
Keywords: Wood / Flow Forming / Thermoplasticity / Deformability / Esterification / Hot-Press / Water Resistance / Re-Molding
Development Trends of Metal and Resin Jointing Technology During Insert Molding Process
井上 悟郎
<要旨> Development trends of metal and resin jointing technology during insert molding process are reviewed. Since the insert molding jointing method is superior in terms of suppressing thermal deterioration and shortening the process, its use in automobile parts and electronic equipment parts is expanding. Until now, there have been concerns about maintaining bonding strength and airtightness due to environmental changes, especially thermal shock loads, but each company has been working to improve them, and it has been shown that they get a certain level of long-term reliability. In addition, even for resins that have been considered difficult to insert molding and bonding, it is found that reliable bonding interfaces can be formed not only by improving the metal surface treatment and resin composition, but also by devising injection molding methods.
Keywords: Metal and Resin Jointing Technology / Insert Molding Jointing Method / NMT / Polymetac™ / Lazeridge / Durability / Amorphous Resin / H&C Molding
グローイングポリマー Polymer Science and I: A Personal Account
Being Passionate
Xiang LI
<要旨> My research interests cover many soft materials, including polymer solutions, colloids, gels, and biological tissues. In particular, I am engaged in elucidating the underlying mechanisms between macroscopic properties and the nanostructures of soft materials by combining structural analysis using light, X-ray, and neutron scattering and rheological techniques.
高分子科学最近の進歩 Front-Line Polymer Science
Recent and Future of Flexible Organic Light Emitting Diode Displays
水﨑 真伸
<要旨> The market of flexible displays is noticeably growing in the recent few years. This article focuses on component parts and new fabrication method of flexible organic light emitting diode (OLED) displays. In particular, flexible substrates and the sealing technology are important for maintaining both high flexibility and reliability. The important factors for the polymer flexible substrates are high transmittance, thermal stability, low birefringence, high gas barrier property, soluble agent resistance, smoothness, and suitability for fabrication processes. The sealing technology thin film encapsulation, which is composed of inorganic and polymer layers, is a good solution for both moisture and gas barrier properties. Furthermore, a new fabrication method was recently proposed for high definition OLED displays employing an orthogonal processing method that uses a fluorous resist and solvent materials.
Keywords: Organic Light Emitting Diode Displays / Flexible / Substrate / Thin Film Encapsulation / Evaporation / Orthogonal Processing / Fluorous Materials