Analysis of the Local Mobility of RAFT Mediated Poly(acrylic acid) Networks via Low Field 1 H‐NMR Techniques for Investigation of the Network Topology
Abstract An in‐depth investigation of the network topology for a series of sodium acrylate hydrogels synthesized via conventional free radical polymerization (FRP) and reversible addition–fragmentation chain transfer (RAFT) polymerization is conducted. The role of the RAFT agent on the crosslinking...
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| Published in | Macromolecular chemistry and physics Vol. 221; no. 1 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2020
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| Abstract | Abstract
An in‐depth investigation of the network topology for a series of sodium acrylate hydrogels synthesized via conventional free radical polymerization (FRP) and reversible addition–fragmentation chain transfer (RAFT) polymerization is conducted. The role of the RAFT agent on the crosslinking process is demonstrated on a model system upon analysis of the reaction mixture via size‐exclusion chromatography before the gelation point. For a comprehensive study, both the impact of the amount of RAFT agent and of the degree of crosslinking on the microstructure of the final product are systematically investigated. In addition to swelling experiments and oscillatory shear rheology measurements, the resulting networks are analyzed via low‐field proton nuclear magnetic resonance (
1
H‐NMR) techniques such as transverse relaxation and double‐quantum coherence to evaluate the network mobility, which is then correlated to structural inhomogeneity. A broader mobility distribution is observed for the RAFT mediated networks compared to the FRP samples, which can be assigned to a higher content of dangling ends in the former case. The results are further elaborated to propose a mechanism for network formation in presence of a RAFT agent. |
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| AbstractList | Abstract
An in‐depth investigation of the network topology for a series of sodium acrylate hydrogels synthesized via conventional free radical polymerization (FRP) and reversible addition–fragmentation chain transfer (RAFT) polymerization is conducted. The role of the RAFT agent on the crosslinking process is demonstrated on a model system upon analysis of the reaction mixture via size‐exclusion chromatography before the gelation point. For a comprehensive study, both the impact of the amount of RAFT agent and of the degree of crosslinking on the microstructure of the final product are systematically investigated. In addition to swelling experiments and oscillatory shear rheology measurements, the resulting networks are analyzed via low‐field proton nuclear magnetic resonance (
1
H‐NMR) techniques such as transverse relaxation and double‐quantum coherence to evaluate the network mobility, which is then correlated to structural inhomogeneity. A broader mobility distribution is observed for the RAFT mediated networks compared to the FRP samples, which can be assigned to a higher content of dangling ends in the former case. The results are further elaborated to propose a mechanism for network formation in presence of a RAFT agent. |
| Author | Arens, Lukas Wilhelm, Manfred Cavalli, Federica Barner, Leonie Pfeifer, Christoph |
| Author_xml | – sequence: 1 givenname: Federica surname: Cavalli fullname: Cavalli, Federica organization: Soft Matter Synthesis Laboratories Institute for Biological Interfaces Karlsruhe Institute of Technology Hermann‐von‐Helmholtz Platz 1 76344 Eggenstein‐Leopoldshafen Germany – sequence: 2 givenname: Christoph surname: Pfeifer fullname: Pfeifer, Christoph organization: Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology Engesserstrasse 18 76131 Karlsruhe Germany – sequence: 3 givenname: Lukas surname: Arens fullname: Arens, Lukas organization: Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology Engesserstrasse 18 76131 Karlsruhe Germany – sequence: 4 givenname: Leonie surname: Barner fullname: Barner, Leonie organization: Soft Matter Synthesis Laboratories Institute for Biological Interfaces Karlsruhe Institute of Technology Hermann‐von‐Helmholtz Platz 1 76344 Eggenstein‐Leopoldshafen Germany, Institute for Future Environments Queensland University of Technology 2 George St Brisbane Queensland 4000 Australia – sequence: 5 givenname: Manfred surname: Wilhelm fullname: Wilhelm, Manfred organization: Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology Engesserstrasse 18 76131 Karlsruhe Germany |
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An in‐depth investigation of the network topology for a series of sodium acrylate hydrogels synthesized via conventional free radical polymerization... |
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