NIPPON GOMU KYOKAISHI

ELASTOMERIC PROPERTIES OF POLYURETHANE PREPARED FROM PTMG REGULATED MOLECULAR WEIGHT DISTRIBUTION

Hitoshi SHIRASAKA, Megumi YAMASHITA, Tadahiro INAGAKI, Shin-ichi INOUE ...

1999 Volume 72 Issue 3 Pages 123-129
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.123

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Linear polyurethane was prepared from a well-defined poly (oxytetramethylene) glycol (PTMG), with oligomers having a various molecular weight distribution (MWD), and a reacted 4, 4′-diphenylmethane diisocyanate (MDI). These linear polyurethanes were crosslinked with a peroxide to produce polyurethane elastomers. The effect of average number of repeating unit (n) and MWD of PTMG on crystallization behavior for polyurethane elastomer was studied by DSC, WAXD, and stress relaxation. The crystallinity of the polyurethane elastomers was reduced not only by decreasing n but also by narrowing MWD of the PTMG. The polyurethane elastomer designed here, showed good strain-induced crystallization behavior and less stress decay.

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EFFECT OF CHEMICAL STRUCTURES OF SULFONATECONTAINING CROSSLINKED POLYURETHANE ELASTOMRS ON IONIC CONDUCTIVE PROPERTY

Kyoko HIRAOKA, Seiji NAKAYAMA, Tetsuo YOKOYAMA

1999 Volume 72 Issue 3 Pages 130-138
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.130

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This work is a continuation of the preceding study on the conductivity of crosslinked polyurethane (PU) elastomers containing quaternary ammonium salt structure in main chain, and is concerned with the effect of chemical structures of crosslinked PU elastomers containing anionic sulfonate group in side chain on ionic conductive property. Anionic crosslinked PU elastomers were prepared from poly (oxypropylene) glycol, poly (oxytetramethylene) glycol, mixtures of each of these with poly (oxyethylene) glycol, poly (caprolactone) glycol, and poly (ethylene adipate) glycol with 2, 4-tolylene diisocyanate by prepolymer technique. NCO-terminated prepolymer was chainextended and cured by using N, N-bis (2-hydroxyethyl) -2-aminoethane sulfonic acid sodium salt as a part of chain extender. Ion content was varied by changing reactant ratio. Anionic crosslinked PU elastomers having ionic conductivity were successfully prepared. Thermal and tensile properties and ionic conductivity (complex impedance) were measured. It became apparent that the conductivity of anionic crosslinked PU elastomers were strongly affected by the compatibility of ionic group and polyols. The highest conductivity was attained by the system based on mixed polyol containing poly (oxyethylene) glycol. Temperature dependence of ionic conductivity obeyed Arrhenius equation for the PUs with phase-separation structure, and Vogel-Tamman-Fulcher equation for those with homogeneous phase strucuture.

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THE ANALYSIS OF SYNTHETIC AND SIDE REACTIONS OF POLYURETHANEUREA

Kazuhiro SUZUOKI, Kenji KAGAWA, Kohnoshin FUKUMA, Bunzo UDA, Jukichi O ...

1999 Volume 72 Issue 3 Pages 139-143
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.139

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Reaction conditions giving linear prepolymers and polyurethaneureas which have less branching were investigated. The content of the main bonds such as allophanates and biurets formed by side reactions in the preparation of prepolymer were measured.
The stability of isocyanates in dimethylacetamide is lower than that in bulk, therefore the bulk method is preferable for preparation of prepolymers.
Reaction of n-butylphenylurea with phenylisocyanate was studied as a model reaction of biuret bond formation, and the rate constant was high enough to make branch in polymerization.
From the results of solvent extraction tests, it was supposed that polyurethaneureas have large composition distribution.

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SYNTHESIS OF DEGRADABLE POLYURETHANE INCORPORATED WITH OLIGOLACTIDE COMPOMENT

Tetsuro SHIIBA, Kiyotaka WAKIYAMA, Mutsuhisa FURUKAWA

1999 Volume 72 Issue 3 Pages 144-149
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.144

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Lactide oligomer with molecular weight of 460 was synthesized and reacted with poly (oxytetramethylene) glycol (PTMG; Mn=650) to obtain oligolactide-terminated PTMG. Polyurethane was synthesized by the oligolactide-terminated PTMG, 4, 4′-diphenylmethane diisocyanate, and 1, 4-butanediol. The mechanical and thermal properties of the polyurethane was studied and compared with PTMG based polyurethane. The degradation behavior of the polyurethane put in the compost was evaluated by SEM, mechanical properties, and weight loss. The surface of the polyurethane degraded for 6 weeks had considerable number of voids. Modulus and weight significantly decreased with increasing time. On the other hand, control PTMG-based polyurethane showed no change after 6 weeks. These results indicate that the novel polyurethane having oligolactide moiety in the backbone-chain easily degrade under bio-active conditions.

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STUDIES ON ELASTIC POLYURETHANE YARNS, PART 1

MOLECULAR STRUCTURE OF SOFT-SEGMENT AND ELASTIC PROPERTIES OF POLYURETHANE YARNS

Jukichi OHMURA, Toshio IWASA, Isamu SUZUKI

1999 Volume 72 Issue 3 Pages 150-159
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.150

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The relationships between soft-segments and the elastic properties of polyurethane yarns were studied. Poly ε-caprolactone diol(PCL), ε-caprolactone(CL)-ethyleneoxide(EO) copolymer diol, PCL-polypropylene glycol (PPG) block copolymer diol, PCL/PPG blend and polytetramethylene glycol (PTG) were used as soft-segments. The effects of molecular weight and molecular weight distribution of diols, and also the effects of chain length of soft-segments on the elastic properties of polyurethane yarns were examined. It was found that the permanent set of polyurethane yarn was related to the chain length of soft-segment and the melting point of diol.

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STUDIES ON ELASTIC POLYURETHANE YARNS, PART 2

MOLECULAR STRUCTURE OF HARD-SEGMENT AND ELASTIC PROPERTIES OF POLYURETHANE YARNS

Jukichi OHMURA, Toshio IWASA, Isamu SUZUKI

1999 Volume 72 Issue 3 Pages 160-168
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.160

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Various types of chain extenders were used as hard-segment of the polyurethane yarn made of poly ε-caprolactone diol (PCL) as a soft-segment, and their physical and elastic properties were compared. It was found that ethylene diamine as the chain extender is siutable, because of it′s good balanced physical and elastic properties. And the introduction of urethane bond made of glycol and aromatic group into hard-segment is recommended to improve tensile elongation and wet heat set of the polyurethane yarn.

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TEMPERATURE DEPENDENCE OF PARALLEL LUMINOUS TRANSMITTANCE FOR POLYURETHANES PREPARED FROM NORBORNANE DIISOCYANATE AND HYDROXY TERMINATED POLYBUTADIENE

Kiyotsugu ASAI, Shin-ichi INOUE, Hiroshi OKAMOTO

1999 Volume 72 Issue 3 Pages 169-171
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.169

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[title in Japanese]

[in Japanese], [in Japanese]

1999 Volume 72 Issue 3 Pages 172-179
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.172

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[title in Japanese]

[in Japanese]

1999 Volume 72 Issue 3 Pages 182-183
Published: 1999
Released on J-STAGE: July 09, 2007

DOIhttps://doi.org/10.2324/gomu.72.182

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