- 4 号 p. 79-
- 3 号 p. 55-
- 2 号 p. 17-
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大坂 昇2025 年 98 巻 3 号 p. 55-62
発行日: 2025年
公開日: 2025/03/26
ジャーナル 認証ありThere have been many attempts to understand the hierarchical structure of polymeric materials by combining different scattering methods. This article is intended for readers who are not familiar with scattering methods and explains the basics of scattering methods and the analysis on hierarchical structures of nm and larger.
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会田 昭二郎2025 年 98 巻 3 号 p. 63-68
発行日: 2025年
公開日: 2025/03/26
ジャーナル 認証ありIn the chemical industry, there is a strong demand for achieving carbon neutrality and promoting the circular use of resources. Utilizing basic chemicals like olefins effectively is a highly efficient approach to meet these goals. We are advancing the development of new materials focused on sustainability and the circular economy. As part of this effort, we are developing a new thermoplastic elastomer (TPE) primarily composed of ethylene, specifically an ethylene/styrene/butadiene terpolymer (ESB). TPEs are plastic materials that exhibit rubber-like softness without requiring special treatments to maintain these properties. This characteristic makes TPEs excellent materials for saving resources and energy. The structure of ESB can be freely controlled by adjusting the proportions of the materials used, the reaction conditions, and the catalysts (substances that facilitate chemical reactions). This control over the structure significantly influences the properties of ESB, such as strength, self-healing capability, and degradability. Consequently, this provides new guidelines for developing innovative materials. This paper aims to provide a clear and comprehensive explanation of how ESB is designed and how its molecular design influences its material properties.
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廣畑 伸雄2025 年 98 巻 3 号 p. 69-71
発行日: 2025年
公開日: 2025/03/26
ジャーナル 認証ありNatural rubber had been commercially planted and cultivated in Bangladesh since 1960s. The production volume of natural rubber has been gradually increasing. Chittagong area, Sylhet area, and Tangail area are main areas for planting and cultivating natural rubber. Bangladesh Forest Industries Development Corporation (BFIDC), a state-owned enterprise, has plantations in these areas, and Chittagong Hill Tracts Development Board has a plantation in Chittagong area. Some private companies are also in charge of planting and cultivating natural rubber. Main business of these companies is the production of tea. They plant and cultivate natural rubber where lands are not suitable for the tea production in their plantation. There are small holders that have the land leasehold right from the government. Ribbed Smoked Sheet (RSS) is the main products, and mainly used for shoes industry and bicycle tire industries. BFIDC is trying to replant with high yield seeds. Some private companies are expanding their cultivating area. In the near future, the production volume would be increased rapidly in Bangladesh.
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第10講 押出加工 その1日本ゴム協会 成形加工技術研究分科会2025 年 98 巻 3 号 p. 72-77
発行日: 2025年
公開日: 2025/03/26
ジャーナル 認証ありPDF形式でダウンロード (4489K)
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