Date
2021-04-21Subject
540 Chemistry 600 Technology 670 Manufacturing CelluloseCelluloseacetateEnergieAktivierungPolymereMetadata
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Aufsatz
Thermal Properties of Plasticized Cellulose Acetate and Its β-Relaxation Phenomenon
Abstract
Cellulose acetate (CA), an organic ester, is a biobased polymer which exhibits good mechanical properties (e.g., high Young’s modulus and tensile strength). In recent decades, there has been significant work done to verify the thermal and thermomechanical behaviors of raw and plasticized cellulose acetate. In this study, the thermomechanical properties of plasticized cellulose acetate—especially its β-relaxation and activation energy—were investigated. The general thermal behavior was analyzed and compared with theoretical models. The study’s findings could be of special interest, due to the known β-relaxation dependency of some polymers regarding mechanical properties—which could also be the case for cellulose acetate. However, this would require further investigation. The concentration of the plasticizers—glycerol triacetate (GTA) and triethyl citrate (TEC)—used in CA ranged from 15 to 40 wt%. DMTA measurements at varying frequencies were performed, and the activation energies of each relaxation were assessed. Increasing plasticizer content first led to a shift in β-relaxation temperature to highervalues, then reached a maximum before declining again at higher concentrations. Furthermore, the activation energy of the β-relaxation constantly rose with increases in plasticizer content. The trend in the β-relaxation temperature of the plasticized CA could be interpreted as a change in the predominant phase of the overlapping β-relaxation of the CA itself and the α′-relaxation of the plasticizer—which appears in the same temperature range. The plasticizer used (GTA) demonstrated a higher plasticization efficiency than TEC. The efficiencies of both plasticizers declined with increasing plasticizer content. Additionally, both plasticizers hit the saturation point (in CA) at the lowest studied concentration (15 wt%).
Citation
In: Polymers Volume 13 / Issue 9 (2021-04-21) eissn:2073-4360Citation
@article{doi:10.17170/kobra-202306098199,
author={Erdmann, Rafael and Kabasci, Stephan and Heim, Hans-Peter},
title={Thermal Properties of Plasticized Cellulose Acetate and Its β-Relaxation Phenomenon},
journal={Polymers},
year={2021}
}
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2023-06-09T12:45:17Z 2023-06-09T12:45:17Z 2021-04-21 doi:10.17170/kobra-202306098199 http://hdl.handle.net/123456789/14811 eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ cellulose acetate plasticized cellulose acetate bio-based polymers glass temperature depression plasticizer glycerol triacetate triethyl citrate beta relaxation activation energy 540 600 670 Thermal Properties of Plasticized Cellulose Acetate and Its β-Relaxation Phenomenon Aufsatz Cellulose acetate (CA), an organic ester, is a biobased polymer which exhibits good mechanical properties (e.g., high Young’s modulus and tensile strength). In recent decades, there has been significant work done to verify the thermal and thermomechanical behaviors of raw and plasticized cellulose acetate. In this study, the thermomechanical properties of plasticized cellulose acetate—especially its β-relaxation and activation energy—were investigated. The general thermal behavior was analyzed and compared with theoretical models. The study’s findings could be of special interest, due to the known β-relaxation dependency of some polymers regarding mechanical properties—which could also be the case for cellulose acetate. However, this would require further investigation. The concentration of the plasticizers—glycerol triacetate (GTA) and triethyl citrate (TEC)—used in CA ranged from 15 to 40 wt%. DMTA measurements at varying frequencies were performed, and the activation energies of each relaxation were assessed. Increasing plasticizer content first led to a shift in β-relaxation temperature to highervalues, then reached a maximum before declining again at higher concentrations. Furthermore, the activation energy of the β-relaxation constantly rose with increases in plasticizer content. The trend in the β-relaxation temperature of the plasticized CA could be interpreted as a change in the predominant phase of the overlapping β-relaxation of the CA itself and the α′-relaxation of the plasticizer—which appears in the same temperature range. The plasticizer used (GTA) demonstrated a higher plasticization efficiency than TEC. The efficiencies of both plasticizers declined with increasing plasticizer content. Additionally, both plasticizers hit the saturation point (in CA) at the lowest studied concentration (15 wt%). open access Erdmann, Rafael Kabasci, Stephan Heim, Hans-Peter doi:10.3390/polym13091356 Cellulose Celluloseacetate Energie Aktivierung Polymere publishedVersion eissn:2073-4360 Issue 9 Polymers Volume 13 false 1356
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