| 高分子 Vol.67 No.11 |
| >> Japanese | >> English |
特集 分散系の織り成す不思議
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| 展望 COVER STORY: Highlight Reviews |
| 自己乳化現象の自在な制御と「超低密度」多孔質バイオマテリアル作製の新技術 Precise Control of Spontaneous Emulsification and Novel Method for Preparing Porous Ultra-Low-Density Biomaterials |
村上 義彦 Yoshihiko MURAKAMI |
| ＜要旨＞ 自己乳化は、非平衡状態の非混和性液体を接触させると自発的にエマルションが生じる現象である。本稿では、自己乳化現象を巧みに利用することによって「超低密度」多孔質バイオマテリアルを作製する筆者らの近年の研究と、今後の展望をまとめる。 Keywords: Spontaneous Emulsification / Porous Biomaterials / Pulmonary Drug Delivery |
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| 高分子を表面コーティングに用いて作る金属微粒子分散系とその利用 Metal Particle Dispersion Systems by using Polymers for Surface Coating and Their Applications |
米澤 徹・松原 正樹 Tetsu YONEZAWA, Masaki MATSUBARA |
| ＜要旨＞ 金属微粒子の多くは有機物で保護されて液中に分散して合成されるが、高分子はその中でも優れた分散剤として知られ、よく利用されるとともに、高分子独自の機能も微粒子に付与できる。今回は、高分子で表面コートされた金属微粒子分散系についてその合成、機能、さらにはエレクトロニクス分野への応用について俯瞰してみる。 Keywords: Polymer-Stabilized / Dispersion / Nanoparticle / Graft Polymerization / Surface Coating / Gelatin |
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| ナノ分子材料のための重合誘起自己組織化 Polymerization-Induced Self-Assembly for Nanomolecular Materials |
杉原 伸治 Shinji SUGIHARA |
| ＜要旨＞ 生体組織は、水や疎水環境で特異的な立体構造を有し、高次構造を形成し機能発現している。高度な合成高分子組織を構築するためには、その根本の重合方法を再検討し、一次構造を制御し、集合体レベルで秩序化していく必要がある。本稿ではその基盤となる方法：精密重合の特徴を利用した「重合誘起自己組織化」について紹介する。 Keywords: Polymerization-Induced / Self-Assembly / Nano-objects / RAFT Polymerization / Dispersion Polymerization / Emulsion Polymerization / Block Copolymer |
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| トピックス COVER STORY: Topics and Products |
| トナー用ポリエステル系樹脂粒子の開発 Development of Polyester Resin Particles for Toner |
中西 秀男 Hideo NAKANISHI |
| ＜要旨＞ We developed new polyester resin particles for use in toner that are prepared by an advanced dissolution suspension method. The new resin particles have excellent characteristics, such as a narrow particle size distribution, a uniform and non-spherical particle shape, and high melt elasticity at high temperature with low-temperature meltability. The narrow particle size distribution, which has a coefficient of variation (CV) under 20%, is obtained by using nanoscale styrene-acrylic particles during the particle formation of the dissolution suspension process. The particle shape is controlled variously from spherical to non-spherical forms, such as spindle or dimple shapes, during the solvent removal process. Moreover, a melting property suitable for toner application is achieved by the elongation reaction of the polyester prepolymer proceeding simultaneously during the particle formation process. Keywords: Resin Particle / Polyester / Toner / Particle Size Distribution / Shape / Prepolymer |
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| 水溶性両親媒多糖の会合特性と乳化能 Characteristics of Association and Emulsification Ability of Water-Soluble Amphiphilic Polysaccharides |
秋山 恵里 Eri AKIYAMA |
| ＜要旨＞ We investigated solution properties of water-soluble amphiphilic polysaccharides. They formed sub-micron sized self-aggregates in dilute aqueous solution through the association of hydrophobic moieties. The size, density, aggregation number of self-aggregate, aggregation number and mobility of alkyl chains in each associating hydrophobic microdomain differed by molecular structures. These association characteristics were controlled by the balance of affinity of hydrophilic main chain to water and aggregation strength of hydrophobic moieties. In the semi-dilute regime, these water-soluble amphiphilic polysaccharides formed a macrogel network and showed a viscosity-increase as revealed by rheological measurements. Rheological properties of these macrogels also differed by the characteristics of sub-micron sized self-aggregates. We also evaluated the emulsification ability of these polymers. Elastic macrogel stabilized emulsions by preventing creaming and coalescence of emulsified particles. Keywords: Water-Soluble Amphiphilic Polymer / Self-Assembly / Sub-Micron Sized Self-Aggregate / Association Characteristic / Thickening Property / Emulsification Ability |
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| 高分子溶液中での粒子間相互作用力 Interaction Forces between Particles in Polymer Solutions |
森 剛志 Takeshi MORI |
| ＜要旨＞ Since the performances of composite materials containing particles dispersed in a polymer resin might be changed depending on the particle dispersibility, it is important to obtain a stable dispersion state. Particle dispersibility in polmer solution could be evaluated from the viewpoint of the surface interaction force, which can be measured using a colloidal probe atomic force microscope (CP-AFM). In this article, a method to measure interaction forces in polymer solutions by the CP-AFM method was explained, and the results of measurement of interaction forces between silica particles in various concentration of PVA solution was introduced. From this study, it was confirmed that the interaction forces were changed depending on the concentration of PVA solutions, and adsorption of PVA on the surface of silica particle influences on interaction forces. Keywords: Composite Materials / Particle Dispersivility / Interaction Forces / Colloidal Probe AFM |
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| グローイングポリマー Polymer Science and I: A Personal Account |
| 回顧録 Memoir |
新 史紀 Hironori ATARASHI |
| ＜要旨＞ When I was an undergraduate student, I was impressed with interfacial polycondensation, which is my first impression of polymer science. So far I have been fascinated with many different research areas in articles and textbooks. In this essay, I review my research life and express my hope for future success. |
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| 高分子科学最近の進歩 Front-Line Polymer Science |
| コロイド粒子の自己集合による構造形成 Self Assembly and Structure Formation of Colloids |
山中 淳平・奥薗 透・豊玉 彰子 Junpei YAMANAKA, Tohru OKUZONO, Akiko TOYOTAMA |
| ＜要旨＞ Colloidal self-assembly has drawn an increasing attention as a bottom-up technique to fabricate mesoscopically ordered materials. In this review, we describe recent advances of colloidal assembly routes to precisely assemble clusters and complex structures, as well as our relevant studies on clustering and crystallization. In particular, we report on (1) colloidal clusters due to electrostatic interaction, DNA hybridization, and depletion interaction, (2) eutectic crystals in multicomponent colloids with depletion interaction, and (3) open crystalline lattices of colloids with interparticle interaction having specificity and directionality. The examples of complex lattice structures include diamond lattices, which have been expected as 3D photonic crystals having a full band gap. Keywords: Colloid / Self-Assembly / Colloidal Cluster / Colloidal Crystal / Electrostatic Interaction / Depletion Interaction / DNA hybridization / Diamond Lattice |
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