Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution
The rheological behavior of polyvinyl alcohol (PVA) aqueous solution is crucial to optimizing the processing technology and performance of PVA products. In this paper, the dynamic rheological behavior of PVA aqueous solution was investigated in detail. PVA solution with a concentration of 10 wt% sho...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/2310-2861/8/8/518 |
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| author | Qingsheng Ni Weijuan Ye Miao Du Guorong Shan Yihu Song Qiang Zheng |
| author_facet | Qingsheng Ni Weijuan Ye Miao Du Guorong Shan Yihu Song Qiang Zheng |
| author_sort | Qingsheng Ni |
| collection | DOAJ |
| description | The rheological behavior of polyvinyl alcohol (PVA) aqueous solution is crucial to optimizing the processing technology and performance of PVA products. In this paper, the dynamic rheological behavior of PVA aqueous solution was investigated in detail. PVA solution with a concentration of 10 wt% showed unnormal rheological behaviors, that is, the liquid-like behavior in the high frequency (<i>ω</i>) region and the solid-like behavior in the low <i>ω</i> region. A storage modulus (<i>G</i>′) plateau appears in the relatively low <i>ω</i> region as a gel with a network structure. Different from conventional hydrogel, this plateau has a low modulus, and the corresponding size of the relaxation unit is estimated to be 554 nm, being higher than the size of a whole PVA chain. It is believed that the network mesh is formed by the intermolecular hydrogen bonding interactions among PVA chains. The relaxation time of these meshes is longer than the reptation time of a PVA chain. Based on the relaxation spectrum and calculation analysis, it is found that the destruction of intermolecular hydrogen bonds, such as by heating up, adding sodium dodecyl sulfate, and shear operation, will make the relaxation unit (mesh) larger and lead to the left shift of the intersection of <i>G</i>′ and loss modulus (<i>G</i>″). In a PVA solution with a high concentration, multiple meshes of various sizes could be formed and thus generate multiple relaxation peaks. The large-sized meshes mainly contribute to the left shift of the intersection of <i>G</i>′ and <i>G</i>″, and the small-sized meshes contribute to the high plateau modulus. The results in this paper offer a new angle to analyze polymer solutions with strong intermolecular interaction. |
| first_indexed | 2024-03-09T13:23:08Z |
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| language | English |
| last_indexed | 2024-03-09T13:23:08Z |
| publishDate | 2022-08-01 |
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| record_format | Article |
| series | Gels |
| spelling | doaj.art-380b6f4c550a4889a143d5ebead42b722023-11-30T21:26:53ZengMDPI AGGels2310-28612022-08-018851810.3390/gels8080518Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous SolutionQingsheng Ni0Weijuan Ye1Miao Du2Guorong Shan3Yihu Song4Qiang Zheng5State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaState Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaThe rheological behavior of polyvinyl alcohol (PVA) aqueous solution is crucial to optimizing the processing technology and performance of PVA products. In this paper, the dynamic rheological behavior of PVA aqueous solution was investigated in detail. PVA solution with a concentration of 10 wt% showed unnormal rheological behaviors, that is, the liquid-like behavior in the high frequency (<i>ω</i>) region and the solid-like behavior in the low <i>ω</i> region. A storage modulus (<i>G</i>′) plateau appears in the relatively low <i>ω</i> region as a gel with a network structure. Different from conventional hydrogel, this plateau has a low modulus, and the corresponding size of the relaxation unit is estimated to be 554 nm, being higher than the size of a whole PVA chain. It is believed that the network mesh is formed by the intermolecular hydrogen bonding interactions among PVA chains. The relaxation time of these meshes is longer than the reptation time of a PVA chain. Based on the relaxation spectrum and calculation analysis, it is found that the destruction of intermolecular hydrogen bonds, such as by heating up, adding sodium dodecyl sulfate, and shear operation, will make the relaxation unit (mesh) larger and lead to the left shift of the intersection of <i>G</i>′ and loss modulus (<i>G</i>″). In a PVA solution with a high concentration, multiple meshes of various sizes could be formed and thus generate multiple relaxation peaks. The large-sized meshes mainly contribute to the left shift of the intersection of <i>G</i>′ and <i>G</i>″, and the small-sized meshes contribute to the high plateau modulus. The results in this paper offer a new angle to analyze polymer solutions with strong intermolecular interaction.https://www.mdpi.com/2310-2861/8/8/518dynamic rheological behaviorPVA aqueous solutionhydrogen bondrelaxation spectrum |
| spellingShingle | Qingsheng Ni Weijuan Ye Miao Du Guorong Shan Yihu Song Qiang Zheng Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution Gels dynamic rheological behavior PVA aqueous solution hydrogen bond relaxation spectrum |
| title | Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution |
| title_full | Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution |
| title_fullStr | Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution |
| title_full_unstemmed | Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution |
| title_short | Effect of Hydrogen Bonding on Dynamic Rheological Behavior of PVA Aqueous Solution |
| title_sort | effect of hydrogen bonding on dynamic rheological behavior of pva aqueous solution |
| topic | dynamic rheological behavior PVA aqueous solution hydrogen bond relaxation spectrum |
| url | https://www.mdpi.com/2310-2861/8/8/518 |
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