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Effect of free-volume holes on static mechanical properties of epoxy resins studied by positron annihilation and PVT experiments. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122225] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lu S, Zhang R, Wang X, Sun P, Lv W, Liu Q, Jia N. Effect of PEO molecular weight on the miscibility and dynamics in epoxy/PEO blends. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2015; 38:118. [PMID: 26577817 DOI: 10.1140/epje/i2015-15118-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 10/23/2015] [Indexed: 06/05/2023]
Abstract
In this work, the effect of poly(ethylene oxide) (PEO) molecular weight in blends of epoxy (ER) and PEO on the miscibility, inter-chain weak interactions and local dynamics were systematically investigated by multi-frequency temperature modulation DSC and solid-state NMR techniques. We found that the molecular weight (M(w)) of PEO was a crucial factor in controlling the miscibility, chain dynamics and hydrogen bonding interactions between PEO and ER. A critical PEO molecular weight (M(crit)) around 4.5k was found. PEO was well miscible with ER when the molecular weight was below M(crit), where the chain motion of PEO was restricted due to strong inter-chain hydrogen bonding interactions. However, for the blends with high molecular weight PEO (M(w) > M(crit)), the miscibility between PEO and ER was poor, and most of PEO chains were considerably mobile. Finally, polarization inversion spin exchange at magic angle (PISEMA) solid-state NMR experiment further revealed the different mobility of the PEO in ER/PEO blends with different molecular weight of PEO at molecular level. Based on the DSC and NMR results, a tentative model was proposed to illustrate the miscibility in ER/PEO blends.
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Affiliation(s)
- Shoudong Lu
- Patent Examination Cooperation Center of the Patent Office, SIPO, Beijing, P. R. China
| | - Rongchun Zhang
- Key Laboratory of Functional Polymer Materials, Ministry of Education; College of Chemistry and School of Physics, Nankai University, 300071, Tianjin, P. R. China
| | - Xiaoliang Wang
- Key Laboratory of High Performance Polymer Materials and Technology, Ministry of Education, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210093, Nanjing, P. R. China.
| | - Pingchuan Sun
- Key Laboratory of Functional Polymer Materials, Ministry of Education; College of Chemistry and School of Physics, Nankai University, 300071, Tianjin, P. R. China.
| | - Weifeng Lv
- Research Institute of Petroleum Exploration & Development, PetroChina, 100083, Beijing, P. R. China
| | - Qingjie Liu
- Research Institute of Petroleum Exploration & Development, PetroChina, 100083, Beijing, P. R. China
| | - Ninghong Jia
- Research Institute of Petroleum Exploration & Development, PetroChina, 100083, Beijing, P. R. China
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