Enthalpy relaxation of low molecular weight amorphous styrene oligomers measured with an adiabatic calorimeter
| Autor: | Itaru Tsukushi, Jun Fujimura, Eri Nishiyama, Mitsuhiro Shibata |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Enthalpy Analytical chemistry 02 engineering and technology urologic and male genital diseases 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oligomer 010406 physical chemistry 0104 chemical sciences Amorphous solid Styrene Calorimeter chemistry.chemical_compound Monomer chemistry Relaxation (physics) Physical and Theoretical Chemistry 0210 nano-technology Glass transition |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 135:2813-2817 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-018-7604-1 |
| Popis: | Herein, we measured the enthalpy relaxation of three styrene oligomers with different molecular weights (styrene oligomer with Mw = 4.53 × 102: PSA-300, styrene oligomer with Mw = 5.89 × 102: PSA-500, and styrene oligomer with Mw = 1.01 × 103: PSA-1000) near their respective glass transition temperatures (Tg) using an adiabatic calorimeter. We determined the relaxation rates and the amounts of configurational enthalpy released from the temperature dependence of the temperature drift rates around Tg. Based on our experimental findings, we found the amounts of configurational enthalpy release per monomer unit to be 0.8, 3.5, and 1.6 kJ mol−1 for PSA-300, PSA-500, and PSA-1000, respectively. These values were 3.9–18 times larger than that of glycerol, which is a typical glass-forming liquid. |
| Databáze: | OpenAIRE |
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