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Jin X, Guo Y, Tu W, Feng S, Liu Y, Blochowicz T, Wang LM. Experimental evidence of co-existence of equilibrium and nonequilibrium in two-glass-transition miscible mixtures. Phys Chem Chem Phys 2020; 22:25631-25637. [PMID: 33150891 DOI: 10.1039/d0cp04494f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Two glass-transitions have been observed in some miscible molecular mixtures with notable differences in geometry or chemistry of constituents. The explanation of the phenomena has been puzzling with diverse structural models. Here, we present detailed studies on two glass-transition mixtures composed of tripropyl phosphate (TPP) and polystyrene (PS) by using calorimetric and dielectric measurements. We found that ageing between the two transitions always generates endothermic peaks at temperatures ∼4 K higher than the ageing temperatures and, subsequent thermal cycles around the peaks can remove the ageing effect and restore the systems, confirming the co-existence of nonequilibrium and equilibrium states in the regions. We also found that the broad glass transition thermogram is associated with highly stretched relaxation dynamics. The results allow us to draw a conclusion of continuous mobility gradient spanning the two TPP-PS glass-transitions, rather than complete phase separation.
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Affiliation(s)
- Xiao Jin
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, China.
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Singh LP, Cerveny S, Alegría A, Colmenero J. Dynamics of Water in Supercooled Aqueous Solutions of Poly(propylene glycol) As Studied by Broadband Dielectric Spectroscopy and Low-Temperature FTIR-ATR Spectroscopy. J Phys Chem B 2011; 115:13817-27. [DOI: 10.1021/jp2073705] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | - Silvina Cerveny
- Centro de Fisica de Materiales (CSIC, UPV/EHU)-Materials Physics Center, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
| | - Angel Alegría
- Departamento de Física de Materiales, UPV/EHU, Facultad de Química, 20018, San Sebastián, Spain
- Donostia International Physics Center, San Sebastián, Spain
| | - Juan Colmenero
- Centro de Fisica de Materiales (CSIC, UPV/EHU)-Materials Physics Center, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
- Departamento de Física de Materiales, UPV/EHU, Facultad de Química, 20018, San Sebastián, Spain
- Donostia International Physics Center, San Sebastián, Spain
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Martínez-García JC, Tamarit JL, Pardo LC, Barrio M, Rzoska SJ, Droz-Rzoska A. Disentangling the Secondary Relaxations in the Orientationally Disordered Mixed Crystals: Cycloheptanol + Cyclooctanol Two-Component System. J Phys Chem B 2010; 114:6099-106. [DOI: 10.1021/jp100270z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julio C. Martínez-García
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Josep Ll. Tamarit
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Luis C. Pardo
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - María Barrio
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Sylwester J. Rzoska
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Aleksandra Droz-Rzoska
- Group de Caracterització de Materials, Department de Física I Enginyeria Nuclear, ETSEIB, Diagonal 647, Universitat Politècnica de Catalunya, 08028 Barcelona, Catalonia, Spain, and Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
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Singh LP, Murthy SSN, Singh G. Study of supercooled orientationally disordered binary solid solutions II: cyclohexyl derivatives, neopentanol and neopentylglycol. Phys Chem Chem Phys 2009; 11:9278-92. [DOI: 10.1039/b907215b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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