2021 Fiscal Year Final Research Report
Crystalline/non-crystalline phase control and development of high-performance acrylic rubber based on the precisely controlled copolymerization
| Project/Area Number |
19K05610
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | アクリルゴム / 結晶性成分 / 耐熱性 / 熱分解 / 乳化重合 |
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| Outline of Final Research Achievements |
Acrylic rubber is a polar synthetic rubber having excellent in heat and ozone resistance. However, further improvement in heat resistance is an urgent issue. In this study, we aimed to improve the performance of acrylic rubber by 1) formation of an effective phase-separated structure by introducing a crystalline component and 2) homogenization of the molecular weight between cross-linking points using copolymerization control.
Acrylate monomers having different alkyl chain lengths were synthesized as crystalline components and copolymerized with ethyl acrylate by emulsion copolymerization. To obtain copolymer containing enough amount of crystalline component, auxiliary emulsifier was indispensable. It was found to be possible to introduce a carboxy group that can be used as a cross-linking site by thermally decomposing a copolymer with tert-butyl acrylate.
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| Free Research Field |
高分子化学
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| Academic Significance and Societal Importance of the Research Achievements |
結晶性成分として側鎖アルキル鎖長がC8およびC16であるアクリル酸オクチル（OA）およびアクリル酸ステアリル（SA）を合成し、通常のブチルゴムの主成分であるアクリル酸エチルと乳化共重合させた。乳化剤の種類ならびに重合前に十分な時間をかけて乳液を作ることにより、結晶性成分を含む共重合体を得ることができた。後者のコポリマーはEA成分由来のガラス転移温度とSA成分由来の融点を有するゴム状物質となった。EAとアクリル酸tert-ブチル(tBA)の共重合体は酸触媒の存在下で加熱するとtBA成分の分解によりカルボキシ基が生成して架橋点として使えることがわかった。
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