Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties

A. Araichimani, Kasper K.J. Baack, R.J. Gaymans

Research output: Contribution to journalArticleAcademic

13 Citations (Scopus)

Abstract

A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4′-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, Mn = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 2010.
Original languageUndefined
Pages (from-to)747-755
JournalPolymer engineering and science
Volume50
Issue number4
DOIs
Publication statusPublished - 2009

Keywords

  • IR-72581

Cite this

Araichimani, A. ; Baack, Kasper K.J. ; Gaymans, R.J. / Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties. In: Polymer engineering and science. 2009 ; Vol. 50, No. 4. pp. 747-755.
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title = "Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties",
abstract = "A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4′-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, Mn = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt {\%} by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 2010.",
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journal = "Polymer engineering and science",
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Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties. / Araichimani, A.; Baack, Kasper K.J.; Gaymans, R.J.

In: Polymer engineering and science, Vol. 50, No. 4, 2009, p. 747-755.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties

AU - Araichimani, A.

AU - Baack, Kasper K.J.

AU - Gaymans, R.J.

PY - 2009

Y1 - 2009

N2 - A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4′-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, Mn = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 2010.

AB - A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4′-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, Mn = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 2010.

KW - IR-72581

U2 - 10.1002/pen.21579

DO - 10.1002/pen.21579

M3 - Article

VL - 50

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EP - 755

JO - Polymer engineering and science

JF - Polymer engineering and science

SN - 0032-3888

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