Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 62, Issue 6
Displaying 1-8 of 8 articles from this issue
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Column
Commentation
Transactions
  • Effect of Thermal History on the Crystallization Behavior of Bacterial Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and the Cold Drawability of Melt Spun Fibers
    Youhei Jikihara, Takashi Saito, Hideki Yamane
    2006 Volume 62 Issue 6 Pages 115-122
    Published: 2006
    Released on J-STAGE: August 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.115
    JOURNAL FREE ACCESS
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    Effect of the thermal history on the crystallization behavior of the bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) with various molecular weights and comonomer contents was examined. PHBH shows a lower Tm than poly(3-hydroxybutyrate) (PHB) homopolymer due to 3-hydroxyhexanoate component as a contaminant and crystallized very slowly when it is cooled from 200 deg, which is higher than Tm of PHB. However, when PHBH is cooled from a temperature lower than Tm of PHB, the crystallization is enhanced and the crystallization temperature is increased. When this sort of thermal history is applied to the melt spinning of PHBH with a high molecular weight, the crystallization is enhanced in the spinline and as spun filament which consists of oriented crystal can be cold drawn into filament with good mechanical properties.
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  • Sorption Behavior of Natural Thermosetting Shellac Resin on Wool Fiber
    Takayuki Okabe, Kaori Sakai, Yoko Yoshida, Kyohei Joko
    2006 Volume 62 Issue 6 Pages 123-129
    Published: 2006
    Released on J-STAGE: August 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.123
    JOURNAL FREE ACCESS
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    Sorption behavior of Shellac, which is of natural thermosetting resin, on wool fibers and enzymatic degradation of Shellac-modified wool fibers were investigated. Although immersed temperature had little effect, Shellac exhaustion depended on Shellac concentration, treatment time, the number of treated times, and also on the nature of solvents. Using methanol for a solvent, the amount of sorbed Shellac was obtained maximum about 0.03g/g-wool and decreased with increase of the molecular weight or size of the alcohol from methanol to t-butanol. The weight loss by enzymatic degradation for wool fibers could be controlled effectively by the sorption of Shellac. From SEM observation of surface morphology of Shellac-modified wool fiber and fractures morphology when extended to break, it was found that Shellac sorbs selectively into the cuticle intercellular regions and affects the strength of cell adhesion. From differential scanning calorimetric curves for untreated wool fiber and wool fiber treated for different treatment time in Shellac methanol solution, it was suggested that the Shellac was sorbed within the cell membrane complex and followed by gradual penetration into the cortex cell, under the treatment conditions of the solvents with smaller molecular weight or size.
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  • Preparation and Properties of Glucose Derivatives having Polymerizable Group I
    - Characterization of Glucose Derivatives Prepared with Methacryl Isocyanate Compound -
    Hideki Sugimoto, Eiji Nakanishi, Katsuhiro Inomata, Toshihisa Miur ...
    2006 Volume 62 Issue 6 Pages 130-134
    Published: 2006
    Released on J-STAGE: August 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.130
    JOURNAL FREE ACCESS
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    In this study, glucose derivatives as novel binders for fiber board, 2-(methacryloyloxy)ethyl carbamate glucose (MOCG), was prepared by reaction of 2-(methacryloyloxy)ethyl isocyanate (MOI) and OH group of glucose. MOCGs which controlled the substitution degree were also prepared by changing the molar ratio of glucose and MOI. The MOCGs were polymerized and physical properties of MOCG homopolymers were evaluated. High substituted MOCG homopolyer showed excellent mechanical property and thermal stability. On the other hand, physical properties of low substituted MOCG homopolymer was lowered by the aggregation of the glucose unit.
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  • Preparation and Properties of Glucose Derivatives having Polymerizable Group II
    - Comparison between Glucose Derivatives Prepared with Different Isocyanate Compounds -
    Hideki Sugimoto, Katsuhiro Inomata, Eiji Nakanishi, Toshihisa Miura ...
    2006 Volume 62 Issue 6 Pages 135-139
    Published: 2006
    Released on J-STAGE: August 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.135
    JOURNAL FREE ACCESS
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    In this study, glucose derivatives as novel binders for fiber board were prepared with isocyanate compounds, 2-hydroxyethyl methacrylate (HEMA) and glucose. 2-(methacryloyloxy)ethyl isocyanate (MOI), Tolylene 2,4- diisocyanate (TDI) and isophorone diisocyanate (IPDI) were used to prepare the glucose derivatives. When TDI and IPDI were used for preparation of glucose derivative, by-products such as glucose-diisocyanate-glucose and HEMAdiisocyanate-HEMA were produced. The glucose derivatives were polymerized and physical properties of the homopolymers were evaluated. The homopolymers show excellent mechanical property and thermal stability.
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