Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 46, Pages 23425-23434Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta07580h
Keywords
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Funding
- Key Major Program of the Natural Science Fundamental Research Project of Jiangsu Colleges and Universities [18KJA430013]
- National Natural Science Foundation of China [51873135]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Scientific Innovation Research of College Graduate in Jiangsu Province [KYLX17_1232]
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The rapid development of flexible transparent electronic devices puts forward more requirements for substrate materials, not only including high transparency, but also possessing good self-healing ability, high mechanical strength and toughness. Herein, a urea-containing chain-extended polydimethylsiloxane (LPx) was first designed and synthesized to construct dynamic physical crosslinks induced by hydrogen bonds. Subsequently, multi-amino terminated hyperbranched polysiloxane (HPSi) was selected as the permanent chemical crosslinking point and connected with LPx through isocyanate with controlled exchangeable aliphatic disulfide (SS-NCO). Consequently, a series of LPx-SS-HP films with hierarchical crosslinked networks and dual dynamic bonds are developed. The chain-extension degree of LPx has been proved to play a key role in adjusting the mechanical, thermal and self-healing properties. Among the serial films, LP2-SS-HP shows the best comprehensive properties, of which the glass transition temperature (T-g), tensile strength, Young's modulus and toughness are as high as 96 degrees C, 8.6 +/- 0.6 MPa, 188.5 +/- 11.2 MPa and 16.3 +/- 0.2 MJ m(-3), respectively. Besides, its outstanding flexibility could generate reversible shape changes from folding to bending and scrolling. After three scratching-healing cycles, the healing efficiency of LP2-SS-HP at the same location is still above 90% and the transmittance at 550 nm is as high as 88.6%. These remarkable properties demonstrate that LP2-SS-HP is a high performance scrollable and foldable substrate for fabricating transparent healable electrodes.
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