Features of structural relaxation in diblock copolymers |
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| Institution: | 1. The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. University of Michigan – Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Center for Advanced Materials, Qatar University, PO Box 2713, Doha, Qatar;2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Praha, Czechia;1. Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang, 37673, Korea;3. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, United States;1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China;2. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China;1. Institute of Fundamental Technological Research, PAS, Warsaw, Poland;2. Institute of Materials Science, University of Silesia, Katowice, Poland;3. Aichi Institute of Technology, Toyota-city, Japan;4. SMP Technologies Inc., Tokyo, Japan |
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| Abstract: | Time- and temperature-dependent structural relaxation (physical aging) of poly (styrene-b-methyl methacrylate) (PS-b-PMMA) block copolymers was investigated by calorimetry. Our study reveals the interplay of the relaxation responses of the two components of the copolymer in an intermediate temperature regime. That is, when the testing temperature is closely below the glass transition temperatures of PS and PMMA, structural relaxation in these polymer phases takes place concurrently, the corresponding thermogram displays partially superposed dual endothermic peaks as a feature of physical aging in the diblock copolymers. The aging response for each component is identified from a curve fitting method and analyzed by the relaxation of enthalpy. Comparing with the homopolymer analogs, the PS and PMMA in diblock copolymers show enhanced aging rate. |
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| Keywords: | Structural relaxation Diblock copolymers Enthalpy recovery Calorimetry |
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