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Volume 72, Issue 2
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[in Japanese]1999 Volume 72 Issue 2 Pages 65
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (84K) -
EFFECT OF CATALYSTS ON FORMATION OF POLAR GROUPS IN URETHANE REACTIONMutsuhisa FURUKAWA, Kazutaka MIYAMOTO1999 Volume 72 Issue 2 Pages 66-73
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe kinetics of the model reaction during phenyl isocyanate, n-butanol, and polymer alcohol at 65°C under the absence and presence of catalysts were investigated. Effects of the catalysts on hard segment distribution and mechanical properties of polyesterurethane elastomers were also studied. Catalysts used were dibutyltin dilaurate (DBTL) and 1, 4-diazabicyclo-(2, 2, 2) octane (DABCO). Polyurethanes were prepared from poly (ethylene adipate) (PEA), TDI, and 1, 4-butanediol (BD) by one-shot method. From the results of kinetic study by using GPC, it is suggested that DABCO accelerates the urethane and allophanate formation and DBTL more urethane than allophanate formation in bulk polymerization. The PUEs prepared under presence of the catalysts contained more trimer [-(TDI- BD)3-] than the PUEs under absence of catalysts. Hard segment length of PUEs prepared under the presence of DABCO have longer than other PUEs. Mechanical properties of the PUEs affected by a kind of catalyst used.View full abstractDownload PDF (892K) -
Eisuke YAMADA, Yukihiro KATO, Shinji INAGAKI1999 Volume 72 Issue 2 Pages 74-81
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSPolyimide-urethane elastomers (PIUEs) were prepared by reacting three different moleculer weight of poly(oxytetramethylene)glycol(PTMG: Mn=1000, 2000 and 3000) with 4, 4′-diphenylmethane diisocyanate (MDI), then further chain extending with various kinds of bifunctional aromatic acid anhydride compounds as a chain extender.
Physical properties of PIUEs prepared from aromatic acid anhydrides were studied by the measurements of thermal stabilities (TGA) and tensile properties at various temperatures. And structure-property relationships of PIUEs were investigated on the basis of the results of thermal analysis (DSC) and dynamic viscoelastic analysis. As the results, it was found that the incorporation of aromatic imiderings to the hard segment of polyurethanes contributed to the enhancement of thermal stabilities and tensile properties.View full abstractDownload PDF (888K) -
THE COMPARISON OF TPU BLENDS AND CO-TPUSEisuke YAMADA, Shinji INAGAKI1999 Volume 72 Issue 2 Pages 82-88
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSPolyurethane elastomers (TPUs) were synthesized by reacting NCO-terminated poly (oxy- tetramethylene) glycol (PTMG: 2000) or Poly (oxypropyrene) glycol (PPG; 2000) with ethylene glycol (EG) as a chain extender, and then TPU blends were prepared to mix with PTMG-TPU and PPG-TPU. On the other hand, co-polyurethane elastomers were synthesized by reacting NCO- terminated prepolymer consisted of PTMG and PPG with EG.
Physical properties of TPU blends and co-TPU were studied by the measurements of thermal analysis (DSC), dynamic viscoelastic analysis and tensile properties at various conditions. The relationship between structures and tensile properties of TPUs were investigated on the basis of the results of them. Tensile properties of blends failed for lower compatibirity of PTMG-TPU and PPG-TPU. On the other hand, tensile properties of co-TPU at higher temperature were improved by the incorporation of a little amount of PPG to the soft segment of TPU. As the results of DSC and dynamic viscoelastic analysis, it was found that the incorporation of PPG contributed to the enhancement of tensile pro-perties through its improving effect on the mobility of chain molecule in soft segment.View full abstractDownload PDF (727K) -
Makoto SUZUKI, Shin-ichiro KAWAHARA, Youichi AMAIKE, Toshiaki KASAZAKI ...1999 Volume 72 Issue 2 Pages 89-95
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe effects of novel hard segment on mechanical properties and morphology of p-phenylene diisocyanate(PPDI) based polyurethane elastomers (PUE) were studied. PUEs were prepared from PPDI, poly(hexamethylene carobanate)glycol, and chain extenders by the prepolymer technique. The chain extenders used were hydroquinonebis(β-hydroxyethyl)ether (HQEE), 2, 2′, 3, 3′-tetrachloro-4, 4′-diaminodiphenylmethane(TCDAM) as novel chemicals, and 1, 4-butane diol as a control. Swelling behavior, hardness, mechanical properties, thermal properties, WAXS, and FT-IR spectra were measured. Distribution of hard segment length was also measured. The maximum temperature which rubber elasticity hold is following order; BD-<HQEE-<TCDAM, while rubbery plateau modulus is following order; BD->HQEE->TCDAM-. The BD-PUE had higher phase separation than TCDAM- and HQEE-PUEs. Distribution of hard segment length in these PUEs was discussed.View full abstractDownload PDF (809K) -
POLYURETHANE CATIONOMER SYNTHESIZED FROM HYDROXY-TERMINATED POLY(OXYTETRAMETHYLENE) WITH IONIC SITES IN THE END OF SEGMENTSYuko IKEDA, Chie KOBAYASHI, Kyoji KAERIYAMA1999 Volume 72 Issue 2 Pages 96-101
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSHydroxy-terminated poly(oxytetramethylene) with ionic sites in the end of segments (HA-PT) was synthesized by the cationic polymerization of tetrahydrofuran using (CF3SO2)2O at 0°C and the termination reaction by using excess of 2-dimethylaminoethanol for a polyurethane synthesis. The molecular weight of HA-PT was ca. 2300. Toluene-2, 4-diisocyanate (TDI) was slowly reacted with HA-PT in dimethyl sulf oxide at 90°C. The obtained polyemr (PUC) was confirmed to be a new polyurethane cationomer by Fourier-transform infrared spectroscopy, i.e., the cationic site existed between the polyether and urethane linkage in PUC. The PUC film prepared by casting from the methanol solution of PUC was an elastomer.View full abstractDownload PDF (616K) -
Kazuhiro SUZUOKI, Kohnoshin FUKUMA, Kenji KAGAWA, Bunzo UDA, Jukichi O ...1999 Volume 72 Issue 2 Pages 102-108
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSRelation between structures and properties of polyurethaneurea synthesized from polytetramethyleneglycol (PTG), diphenylmethanediisocyanate (MDI), and ethylenediamine was investigated. Average chain length of softsegment and hardsegment was simulated stastically based on the measurement of unreacted free MDI in prepolymer. Influence of chemical structures such as the length of softsegment, hard segment and PTG, the molecular weight distribution of PTG, and the molecularweight of polyurethaneurea on the elasticity was studied. The importance of low melting point of softsegment and small hard domain size were appointed to realize good elasticity.View full abstractDownload PDF (783K) -
1999 Volume 72 Issue 2 Pages 109-118
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (1522K) -
[in Japanese]1999 Volume 72 Issue 2 Pages 120-121
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (251K)
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