| 高分子 Vol.69 No.2 |
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特集 くっつける技とはがす技
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| 展望 COVER STORY: Highlight Reviews |
| オンデマンド型接着接合：異種材料接合と易解体性接着の融合に向けて On-Demand Adhesion Bonding: Toward Integration of Dissimilar Materials Bonding and Dismantlable Adhesion |
松本 章一 Akikazu MATSUMOTO |
| ＜要旨＞ 省エネルギーや低環境負荷の観点から、金属材料に代わってポリマーや複合材料が利用されるようになり、同時に信頼性の高い接合手法の開発が課題として浮上している。筆者らが取り組んできた異種材料接合や易解体性接着の開発経緯を概説し、さらに接着接合と解体剥離を兼ね備えたオンデマンド型接着接合システムの構築に向けての展望を述べる。 Keywords: Anchor Effect / BOC Protection / Dissimilar Materials Bonding / Epoxy Monolith / Dismantlable Adhesion / Metal-Resin Bonding / Porous Materials / Thermal Decomposition |
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| 異種材料接着・接合のための微細表面構造化 Surface Structuring for Hybrid Materials Adhesion and Joining |
安田 清和 Kiyokazu YASUDA |
| ＜要旨＞ 異種材料接着・接合のために金属表面に微細な特異構造を形成することにより、従来の接着や溶接とは根本的に接合原理の異なる新たな工法が期待できる。表面構造化による接合は、微細機械的インターロック機構によるため、高分子を含む界面設計自由度が高い。異種材料接着・接合のための最新の表面構造化の研究動向を報告する。 Keywords: Hybrid Bonding / Dissimilar Materials Joining / Surface Structuring / Laser Joining / Ultrasonic Bonding / Multi-Materials / Interface Design / Micro Mechanical Interlocking |
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| トピックス COVER STORY: Topics and Products |
| プラズマ処理を用いるフッ素樹脂の接着 Adhesion of Fluoropolymers via Heat-Assisted Plasma Treatment |
大久保 雄司 Yuji OHKUBO |
| ＜要旨＞ Fluoropolymers such as polytetrafluoroethylene (PTFE) are one type of difficult polymers to adhere to other types of materials. Conventional plasma treatments, for example plasma treatment under low pressure and/or at low temperature, are not effective to improve the adhesion property of PTFE. Our research group discovered three key points for improvement of this property via plasma treatment; suitable pressure during plasma treatment, suitable surface temperature of PTFE, and no use of certain gases. In this paper, we will explain the reason why heating during plasma treatment drastically improves the adhesion property of PTFE. We realized adhesive-free strong adhesion between PTFE and unvulcanized isobutylene-isoprene rubber (IIR). We also successfully realized strong adhesion between PTFE and vulcanized polydimethylsiloxane (PDMS) rubber when the vulcanized PDMS surface was also plasma-treated. In addition, plasma-treated PDMS rubber was applied to strongly adhere PTFE to other types of materials such as copper film, stainless steel plate, and glass plate. Keywords: Fluoropolymers / Heat-Assisted Plasma Treatment / Surface Temperature / Adhesive-Free Adhesion / Cohesion Failure |
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| タッキファイヤの表面偏析を利用した高耐熱アクリル系粘着剤の開発 Novel Acrylic PSA Based on Tackifier Segregation onto the Surface |
中村 賢一 Kenichi NAKAMURA |
| ＜要旨＞ The properties of a novel pressure sensitive adhesive (PSA) based on tackifier (TF) surface segregation were compared with the general PSAs with or without conventional TF. The peel strengths of the general PSAs were relatively high at room temperature, but decreased drastically under high temperature such as 60℃ and 85℃. On the other hand, the novel PSA based on TF surface segregation maintained high peel strength under high temperatures. The improvement of adhesion was more effective for polyolefin. Keywords: Tackifier / Surface Segregation / Pressure Sensitive Adhesive |
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| クール－オフおよびウォーム－オフ機能をもつ易剥離性粘着剤 Easily Peelable PSAs with Cool-Off and Warm-Off Functions |
村上 裕人 Hiroto MURAKAMI |
| ＜要旨＞ A side-chain crystalline acrylic pressure sensitive adhesive (PSA) is thermosensitive, because its adhesion can be controlled by a reversible order-disorder transition of the side-chain crystalline unit with a change in temperature. There are two types of thermosensitive PSAs: cool-off (CO) and warm-off (WO) types. The problem of the CO type PSA is that a treatment at high temperature over 200℃ results in a decline in CO function. The problem of the WO type PSA is that the WO function occurs in a broad temperature range earlier than the main transition temperature due to the use of a random-WO component. To solve these problems, we developed an acrylic PSA bearing a mesogenic unit and a silicone PSA containing a side-chain crystalline siloxane for the CO type, and a PSA containing an acrylic copolymer grafted with a side-chain crystalline acrylic macromonomer as the WO component. In this article, we describe the performance of these PSAs. Keywords: Side-Chain Crysatlline / Acrylic PSA / Silicone PSA / Easily Peelable |
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| アゾベンゼン高分子系固液相転移材料の合成と可逆接着剤への応用 Liquid-Solid Phase Change Materials Composed of Azobenzene Polymer, And its Reversible Adhesive Bonding |
秋山 陽久 Haruhisa AKIYAMA |
| ＜要旨＞ We synthesized an azobenzene polymer that exhibits a photophase transition between liquid and solid state. The length of the alkyl group is important in polymer materials exhibiting phase transitions. Fluidity in the liquid state is enhanced by long alkyl chains. It was suggested that the solid phase was stabilized by aggregation of azobenzene moieties. The performance of this material as a reversible adhesive for glass substrates has been evaluated and proven. In addition, the use of a block copolymer structure has improved toughness on thin film formation without reducing adhesive strength. Keywords: Azobenzene / Polymer / Isomerization / Reversible Adhesives / Block Copolymer |
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| グローイングポリマー Polymer Science and I: A Personal Account |
| まだ見ぬ新しい高分子合成反応を目指して Toward the Synthesis of Polymers |
神林 直哉 Naoya KANBAYASHI |
| ＜要旨＞ In this essay, I describe the story of my personal research history in graduate school, and how I have developed my interests to the area of polymer synthesis from my original research backgrounds, organic and organometallic chemistry. |
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| 高分子科学最近の進歩 Front-Line Polymer Science |
| セルロースナノファイバーの構造・物性および材料への展開状況 Recent Development of Production, Characterization and Applications for Cellulose Nanofibers |
上谷 幸治郎・古賀 大尚・能木 雅也 Kojiro UETANI, Hirotaka KOGA, Masaya NOGI |
| ＜要旨＞ Cellulose nanofibers with widths of 3～50 nm originate from bacteria, tunicates, and higher plants and have excellent physical properties such as high aspect ratio, high specific surface area, high crystallinity, high strength, high thermal dimensional stability, biocompatibility, and biodegradability. Based on these attractive properties, cellulose nanofibers have received worldwide attention from industry, academia and government as new bio-nanomaterials toward a sustainable society. Herein, we introduce preparation techniques, fundamental structures and properties of cellulose nanofibers, and show an overview of their present applications and future challenges. Keywords: Cellulose Nanofiber / Cellulose Nanopaper / Transparent Paper / Biomass / Composite / Green Chemistry / Green Electronics |
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