Arm-length-dependent phase transformation and dual dynamic healing behavior of supramolecular networks consisting of ureidopyrimidinone-end-functionalized semi-crystalline star polymers
- Authors
- Lee, W.; Kwak, S.-Y.; Chung, J.W.
- Issue Date
- Sep-2020
- Publisher
- Elsevier Ltd
- Keywords
- Crystalline physical bond; Dual dynamic supramolecular network; Phase transformation; Self-healing; Ureidopyrimidinone
- Citation
- European Polymer Journal, v.138
- Journal Title
- European Polymer Journal
- Volume
- 138
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/39702
- DOI
- 10.1016/j.eurpolymj.2020.109976
- ISSN
- 0014-3057
- Abstract
- A rigid crystalline structure suppresses chain mobility and diffusion of self-healing supramolecular networks, lowering their healing capabilities. Herein it is presented that the incorporation of crystals in self-healing supramolecular networks as an effective way to overcome the inherent lack of mechanical strength of self-healing supramolecular networks, instead of a healing barrier. We prepare dual dynamic supramolecular networks composed of two types of dynamic physical bonds, i.e., quadruple hydrogen bonds and crystalline physical bonds, using the ureidopyrimidinone (UPy)-end-functionalized semi-crystalline star-shaped poly(ε-caprolactone)s (USPs). With increasing arm-length of the USPs, the phase of the network changes from UPy-stacked crystals to an amorphous phase and further to chain-folding polymeric crystals. The healing capabilities are also enhanced with increasing the arm-length of the USPs. Such changes in phase and healing capability are strongly associated with the crosslinking density of the network. In addition, the appropriate arm-length balance of USPs can provide a mechanically rigid semi-crystalline supramolecular network with a highly efficient healing property due to their reversible dual dynamic features, associated with the re-association of UPy quadruple hydrogen bonds and restoration of crystalline physical bonds during healing. © 2020 Elsevier Ltd
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