Journal of The Adhesion Society of Japan
Online ISSN : 2187-4816
Print ISSN : 0916-4812
ISSN-L : 0916-4812
Volume 55 , Issue 8
Showing 1-3 articles out of 3 articles from the selected issue
Review
  • Takaaki TSURUOKA, Shoya HIRAO, Yohei TAKASHIMA, Kensuke AKAMATSU
    2019 Volume 55 Issue 8 Pages 301-307
    Published: August 01, 2019
    Released: September 03, 2019
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    The development of thin films consisting of metal-organic frameworks( MOFs) crystals depends on aknowledge of the mechanisms of the fabrication processes to control their functions, because the surfacemorphologies, sizes, shapes, and linkage of each crystals of MOFs correlate strongly with their properties. Thisreview presents the conventional approach for preparing MOF crystals in solution phase, recent innovativeprocessing methods for MOF crystal-based thin films, and our approach for selective formation of MOF crystalsat interfaces between reaction solution and solid substrate by using metal ion-doped polymer substrate.

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Review
  • Kentaro ABE
    2019 Volume 55 Issue 8 Pages 296-300
    Published: August 01, 2019
    Released: August 22, 2019
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    It is well-known that nanofibers are produced in nature, for example, collagen fibrils in tendons andligaments and silk fibroin. Among the variety of natural nanofibers, cellulose microfibrils, which are the majorconstituent of plant cell walls, are the most abundant natural nanofiber on earth. The cellulose microfibrilshave great potential for use as reinforcement in nanocomposites and have attracted a great deal of interestrecently. Many researchers are now tackling the isolation of cellulose nanofibers from plant sources along withtheir efforts to utilize the nano elements. This report reviews the preparation of cellulose nanofibers fromvarious plant sources.Key words : Cellulose

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Original Paper
  • Susumu ICHIMURA
    2019 Volume 55 Issue 8 Pages 287-295
    Published: August 01, 2019
    Released: August 22, 2019
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    In recent years, weight reduction of cars has been progressing. As a method of weight reduction, replacingmetal parts with resin parts is done. In the case of resin parts, they are often bonded using an adhesive.However, many resins have poor adhesion and it is necessary to modify the surface in some way. The useof primers has tended to avoid poor adhesion, but environmental regulations have increased the need foralternative technologies. The author focused on atmospheric pressure plasma treatment from the viewpointof safety and mass productivity. On the other hand, it has been reported that thin films can be formed usingatmospheric pressure plasma processing.Water contact angle and XPS analysis revealed that polar group such as hydroxy group can be introduced byatmospheric pressure plasma treatment of polypropylene surface. As the irradiation distance became shorter,the introduction amount of the functional group derived from oxygen increased. Experimental results indicatethat ozone and oxygen radical( atomic oxygen) react with hydrogen and methyl group of polypropylene sidechain, and substitution proceeds on polar group such as hydroxy group and the surface of polypropylene ispolarized by the introduced functional group. The SEM also showed that the surface treated with atmosphericpressure plasma had no noticeable damage. Compared with the untreated polypropylene( bonding strength:0.60 MPa), the bonding strength became 13 times for the sample( bonding strength: 8.05 MPa) optimallysubjected to atmospheric pressure plasma treatment. In the HMDS treatment using aqueous solution, it wasshown that there is a high possibility that a layer containing a substance very close to SiO2 is formed on thesurface of polypropylene. The surface was shown to increase in hardness due to thin film formation. Thepossibility of imparting functions other than surface hydrophilization and improvement of bonding strengthwas shown.

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