Effect of polymer glycols on micro-aggregation structure and mechanical properties of Spherulite size graded polyurethane elastomers

Teerin Kongpun, Ken Kojio, Mutsuhisa Furukawa

研究成果: ジャーナルへの寄稿記事

1 引用 (Scopus)

抄録

Spherulite size graded polyurethane elastomers (PUEs) were prepared using a mold with a temperature gradient from different polymer glycols, 4,40-diphenylmethane diisocyanate (MDI) and a mixture of 1,4-butanediol (BD), and 1,1,1-trimethylol propane (TMP) as a curing agent by a prepolymer method. The used polymer glyocols were poly(oxytetramethylene)glycol (PTMG, M n = 2000), poly(ethylene adipate)glycol (PEA, Mn = 2000), and poly(hexamethylene adipate)glycol (PHA, Mn = 2000). The effect of polyether and polyester glycols and the temperature gradient on the micro-aggregation structure and mechanical properties were studied by polarized optical microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, micro-hardness test, pulsed nuclear magnetic resonance spectroscopy, and tensile test. The prepared PUEs had spherulite size graded super-structure. Spherulite sizes of the PUEs depended significantly on the temperature gradient of the mold. Spherulite of the PUEs in contact with the mold at low temperature was significantly smaller and more dense than that contacting the mold at high temperature. The spherulite diameter of PTMG-, PEA-, and PHA-PUEs changed from 12.6 to 16.3 m̈m, 8.4 to 15.6 m̈m, and 10.4 to 16.0 m̈m, respectively from the lower temperature side (LTS) toward the higher temperature side. In contrast, the number of spherulites became sparser toward the higher one. The glass transition temperature (Tg) of PTMG-, PEA-, and PHA-based PUEs elevated from -55.3°C, -19.0°C and -33.8°C at the LTS to -48.6°C, -17.8°C and -32.8°C at the HTS, respectively. Tg of all PUEs exhibited elevation from the LTS toward the higher one. This result associated with the strong microphase separation of the LTS.

元の言語英語
ページ(範囲)1454-1461
ページ数8
ジャーナルJournal of Applied Polymer Science
113
発行部数3
DOI
出版物ステータス出版済み - 8 5 2009
外部発表Yes

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Elastomers
Glycols
Polyurethanes
Polymers
Agglomeration
Mechanical properties
Thermal gradients
Temperature
Microphase separation
Propane
Polyesters
Polyethers
Microhardness
Nuclear magnetic resonance spectroscopy
Polyethylene glycols
Optical microscopy
Fourier transform infrared spectroscopy
Curing
Differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Polymers and Plastics
  • Surfaces, Coatings and Films
  • Chemistry(all)

これを引用

Effect of polymer glycols on micro-aggregation structure and mechanical properties of Spherulite size graded polyurethane elastomers. / Kongpun, Teerin; Kojio, Ken; Furukawa, Mutsuhisa.

:: Journal of Applied Polymer Science, 巻 113, 番号 3, 05.08.2009, p. 1454-1461.

研究成果: ジャーナルへの寄稿記事

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abstract = "Spherulite size graded polyurethane elastomers (PUEs) were prepared using a mold with a temperature gradient from different polymer glycols, 4,40-diphenylmethane diisocyanate (MDI) and a mixture of 1,4-butanediol (BD), and 1,1,1-trimethylol propane (TMP) as a curing agent by a prepolymer method. The used polymer glyocols were poly(oxytetramethylene)glycol (PTMG, M n = 2000), poly(ethylene adipate)glycol (PEA, Mn = 2000), and poly(hexamethylene adipate)glycol (PHA, Mn = 2000). The effect of polyether and polyester glycols and the temperature gradient on the micro-aggregation structure and mechanical properties were studied by polarized optical microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, micro-hardness test, pulsed nuclear magnetic resonance spectroscopy, and tensile test. The prepared PUEs had spherulite size graded super-structure. Spherulite sizes of the PUEs depended significantly on the temperature gradient of the mold. Spherulite of the PUEs in contact with the mold at low temperature was significantly smaller and more dense than that contacting the mold at high temperature. The spherulite diameter of PTMG-, PEA-, and PHA-PUEs changed from 12.6 to 16.3 m̈m, 8.4 to 15.6 m̈m, and 10.4 to 16.0 m̈m, respectively from the lower temperature side (LTS) toward the higher temperature side. In contrast, the number of spherulites became sparser toward the higher one. The glass transition temperature (Tg) of PTMG-, PEA-, and PHA-based PUEs elevated from -55.3°C, -19.0°C and -33.8°C at the LTS to -48.6°C, -17.8°C and -32.8°C at the HTS, respectively. Tg of all PUEs exhibited elevation from the LTS toward the higher one. This result associated with the strong microphase separation of the LTS.",
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