Dynamical Correlations for Statistical Copolymers from High-Throughput Broad-Band Dielectric Spectroscopy
| Autor: | Alamgir Karim, Jing Zhao, Chad R. Snyder, Kevin A. Cavicchi, David S. Simmons, Tzu-Yu Lai, Xiao Zhang, Changhuai Ye |
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| Rok vydání: | 2019 |
| Předmět: |
Models
Molecular Acrylic Resins 010402 general chemistry Kinetic energy 01 natural sciences Phase Transition Fragility Transition Temperature Computer Simulation Mixing (physics) chemistry.chemical_classification Molecular Structure 010405 organic chemistry General Chemistry General Medicine Polymer 0104 chemical sciences Computational physics Dielectric spectroscopy Kinetics chemistry Dielectric Spectroscopy Relaxation (physics) Coaxial Glass transition Software |
| Zdroj: | ACS Combinatorial Science. 21:276-299 |
| ISSN: | 2156-8944 2156-8952 |
| DOI: | 10.1021/acscombsci.8b00160 |
| Popis: | Broad-band dielectric spectroscopy (BDS) provides a powerful method of characterizing relaxation dynamics in diverse materials. Here we describe and employ a novel instrument for high-throughput broad-band dielectric spectroscopy (HTBDS) that accelerates this capability, enabling simultaneous measurements of 48 samples. This capability is based around a coaxial switching system for rapid scanning between multiple samples on the same sample stage, coordinated with shared environmental control. We validate the instrument by measuring dielectric response in three polymers, distributed across 48 sample sites, and comparing results to measurements via a standard BDS instrument. Results are found to be reproducible and are in agreement with relaxation times from traditional BDS. We then employ HTBDS to establish mixing rules for glass transition temperatures, kinetic fragility indices, and segmental stretching exponents in a series of acrylate copolymers, a matter of considerable technological interest in a variety of technological applications. Results are consistent with the empirical Fox rule for the glass transition temperature T |
| Databáze: | OpenAIRE |
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