Annealing effects on the thermal properties of liquid crystalline polyurethanes
This work is a continuation of our earlier investigations of liquid crystalline polyurethanes prepared from 4,4′‐bis(2‐hydroxyethoxy) biphenyl (BHBP), 2,4‐tolylene diisocyanate (TDI), and poly (oxytetramethylene) diols (PTMO). The annealing effects on the thermal properties of the investigation poly...
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| Veröffentlicht in: | Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 1994-10, Vol.32 (13), p.2559-2563 |
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| container_end_page | 2563 |
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| container_issue | 13 |
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| container_title | Journal of polymer science. Part A, Polymer chemistry |
| container_volume | 32 |
| creator | Szczepaniak, Barbara Frisch, Kurt C. Penczek, Piotr Rudnik, Ewa |
| description | This work is a continuation of our earlier investigations of liquid crystalline polyurethanes prepared from 4,4′‐bis(2‐hydroxyethoxy) biphenyl (BHBP), 2,4‐tolylene diisocyanate (TDI), and poly (oxytetramethylene) diols (PTMO). The annealing effects on the thermal properties of the investigation polyurethanes are presented for three samples with the same BHBP content, different flexible spacer length, and different molecular weight of the polyurethanes. The annealed polyurethanes were investigated by means of DSC, and polarizing microscopy. The results of the thermal analysis show that the temperatures of phase transitions depend on the annealing temperature and time. These dependences are different for different molecular weights. © 1994 John Wiley & Sons, Inc. |
| doi_str_mv | 10.1002/pola.1994.080321319 |
| format | Article |
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The annealing effects on the thermal properties of the investigation polyurethanes are presented for three samples with the same BHBP content, different flexible spacer length, and different molecular weight of the polyurethanes. The annealed polyurethanes were investigated by means of DSC, and polarizing microscopy. The results of the thermal analysis show that the temperatures of phase transitions depend on the annealing temperature and time. These dependences are different for different molecular weights. © 1994 John Wiley & Sons, Inc.</description><identifier>ISSN: 0887-624X</identifier><identifier>EISSN: 1099-0518</identifier><identifier>DOI: 10.1002/pola.1994.080321319</identifier><identifier>CODEN: JPLCAT</identifier><language>eng</language><publisher>New York: John Wiley & Sons, Inc</publisher><subject>Annealing ; annealing effect ; Applied sciences ; Calorimetry ; Exact sciences and technology ; main-chain liquid crystalline polymers ; Microscopic examination ; Molecular structure ; Molecular weight ; Organic polymers ; Phase transitions ; Physicochemistry of polymers ; Properties and characterization ; Synthesis (chemical) ; Thermal and thermodynamic properties ; Thermal effects ; Thermoanalysis ; Thermodynamic properties ; Thermotropic liquid crystals ; thermotropic polyurethane</subject><ispartof>Journal of polymer science. 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Part A, Polymer chemistry</title><addtitle>J. Polym. Sci. A Polym. Chem</addtitle><description>This work is a continuation of our earlier investigations of liquid crystalline polyurethanes prepared from 4,4′‐bis(2‐hydroxyethoxy) biphenyl (BHBP), 2,4‐tolylene diisocyanate (TDI), and poly (oxytetramethylene) diols (PTMO). The annealing effects on the thermal properties of the investigation polyurethanes are presented for three samples with the same BHBP content, different flexible spacer length, and different molecular weight of the polyurethanes. The annealed polyurethanes were investigated by means of DSC, and polarizing microscopy. The results of the thermal analysis show that the temperatures of phase transitions depend on the annealing temperature and time. 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| ispartof | Journal of polymer science. Part A, Polymer chemistry, 1994-10, Vol.32 (13), p.2559-2563 |
| issn | 0887-624X 1099-0518 |
| language | eng |
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| subjects | Annealing annealing effect Applied sciences Calorimetry Exact sciences and technology main-chain liquid crystalline polymers Microscopic examination Molecular structure Molecular weight Organic polymers Phase transitions Physicochemistry of polymers Properties and characterization Synthesis (chemical) Thermal and thermodynamic properties Thermal effects Thermoanalysis Thermodynamic properties Thermotropic liquid crystals thermotropic polyurethane |
| title | Annealing effects on the thermal properties of liquid crystalline polyurethanes |
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