Journal of Networkpolymer,Japan
Online ISSN : 2434-2149
Print ISSN : 2433-3786
Current issue
Displaying 1-5 of 5 articles from this issue
Original
  • Kenya Tachibana, Yusuke Inoue, Ryuichi Murata
    2025 Volume 46 Issue 1 Pages 2-7
    Published: January 10, 2025
    Released on J-STAGE: January 25, 2025
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    As a result of studying the possibility of thermal decarboxylation of 4-hydroxybenzoic acid (hereafter 4-HBA), a precursor of phenol, we confirmed that phenol can be recovered in a yield of over 85% by the coexistence of acid catalysts such as zeolite and sulfuric acid. When zeolite used as catalysts, zeolite with a proton as a cation, a pore size of ZSM-5 or greater and high acid content characteristics is preferred. When sulfuric acid is used as a catalyst, conditions of at least 3wt% addition, a temperature of at least 230°C and a time of at least 30 minutes are preferred. The possibility of recovering bio-phenol (phenol obtained from biomass) from the 4-HBA fermentation solution obtained by the microbial fermentation production process was investigated. Bio-phenol could be recovered with a phenol yield of more than 85% and a phenol purity of more than 95% by heating and distilling the 4-HBA crude crystals obtained from the 4-HBA fermentation solution by acid crystallization treatment. The process is expected to be efficient in terms of energy and cost, as sulfuric acid in the acid crystallization treatment can be used as a catalyst and the phenol vaporized in the heat treatment can be recovered directly by distillation.

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  • Hidetaka Sakai, Atsushi Sudo
    2025 Volume 46 Issue 1 Pages 8-14
    Published: January 10, 2025
    Released on J-STAGE: January 25, 2025
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    The reductive coupling of aldehydes is a useful method for synthesizing 1,2-diols. In this study, we applied the visible-light-driven reductive coupling method that we have investigated to the reaction of furfural, synthesizing a 1,2-diol with furan moieties. Furthermore, a polyaddition reaction between this diol and diisocyanate was conducted to produce a polyurethane with furan moieties in the side chains. By utilizing the reversible Diels-Alder reaction between the furan moieties in the polyurethane’s side chains and bismaleimide, a reversible cross-linking and de-cross-linking system was achieved.

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Review
  • Yosuke Sumiya
    Article type: review-article
    2025 Volume 46 Issue 1 Pages 15-24
    Published: January 10, 2025
    Released on J-STAGE: January 25, 2025
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    The use of adhesives for material joining is a fundamental technology across numerous industrial sectors. Adhesion phenomena are also of interest in fundamental science, with extensive experimental and theoretical studies conducted to uncover the underlying mechanisms. However, due to the challenges in directly observing adhesive interfaces, the molecular- level understanding of the adhesive interactions formed between the adherend and the adhesive polymer -and how factors such as atmospheric moisture act as inhibitors to modify these interactions-remains limited. This paper highlights recent theoretical research that tackles these issues using quantum chemical calculations.

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  • [in Japanese], Yasumasa Takenaka
    2025 Volume 46 Issue 1 Pages 25-35
    Published: January 10, 2025
    Released on J-STAGE: January 25, 2025
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    Acrylic monomers such as acrylic acid and methacrylic acid are synthesized from petroleum-derived raw materials. Therefore, acrylic polymers used as raw materials for acrylic resins are petroleum-based highly functional polymers. Synthetic polymers made from petroleum-derived raw materials, which are carbon sources buried in the ground, are often considered a problem as a cause of global warming because many of them are incinerated after use, releasing carbon dioxide, which is considered a greenhouse gas, into the atmosphere. On the other hand, many acrylic monomers available from biomass are acrylic compounds with substituents at the β-position, and are known to have low polymerization activity at the carbon-carbon double bond moiety. Therefore, it has been considered difficult to synthesize biomass-based acrylic polymers using biomass-based acrylic monomers as raw materials. In this paper, we describe the synthesis of biomass-based acrylic polymers using biomass-based acrylic monomers as raw materials.

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Comprehensive
  • Keiko Ohtsuka
    2025 Volume 46 Issue 1 Pages 36-44
    Published: January 10, 2025
    Released on J-STAGE: January 25, 2025
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    Polyrotaxane, consisting of a linear axial polymer and multiple cyclic molecules, is a supramolecular polymer in which the axial polymer and cyclic molecules are mechanically entangled without covalent bonds. Because of its unique structure, the cyclic molecules are able to slide and rotate freely on the axial polymer. Until now, polyrotaxane have been widely investigated in soft materials such as gels and elastomers. Recently, polyrotaxanes have also been studied for toughening network polymers by using their unique properties. We have developed maleimide resin with significantly improved toughness and heat resistance by the introduction of polyrotaxane. Furthermore, it was found that the phase structure and curing properties are characterized by the structure of the functional group at the end of the cyclic molecule of the polyrotaxane.

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