Robust, healable and hydrophobically recoverable polydimethylsiloxane based supramolecular material with dual-activate h

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bust, healable and hydrophobically recoverable polydimethylsiloxane based supramolecular material with dual-activate hard segment 1

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LV Chi , QI YuHao , HU RuoFei & ZHENG JunPing 1

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Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, 2

Tianjin University, Tianjin 300350, China; College of Chemistry and Chemical Engineering, Dezhou University, Dezhou 253023, China Received April 25, 2020; accepted June 11, 2020; published online November 18, 2020

In this paper, a novel dual-activate hard segment strategy is proposed for the fabrication of polydimethylsiloxane (PDMS) based supramolecular polymer (PDMS-PDITC-IPDI). The unique design endows the PDMS-PDITC-IPDI with high toughness (43.1– 3 24.5 MJ/m ), tensile strength (11.3–6.6 MPa) and elongation at break (730%–615%), and the mechanical properties and dynamic property can be regulated by varying degrees of hard segment activation. Moreover, the PDMS-PDITC-IPDI polymers exhibit excellent self-recovery property during successive loading-unloading processes. Additionally, both wettability damage caused by O2 plasma treatment and mechanical damage can be healed by simple heating, showing good hydrophobic recovery and selfhealability. Taking advantages of merits of the PDMS-PDITC-IPDI, the applications of the material as recyclable adhesive and 3D printing material are also investigated. high strength, hydrophobic recovery, self-healing, PDMS, 3D printing Citation:

Lv C, Qi Y H, Hu R F, et al. Robust, healable and hydrophobically recoverable polydimethylsiloxane based supramolecular material with dual-activate hard segment. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-020-1674-7

1 Introduction Benefitting from the unique molecular structure, polydimethylsiloxane (PDMS) based materials exhibit fascinating hydrophobicity, flexibility and nontoxicity [1–3]. In recent years, they are widely used in adhesives, sealants and coatings, etc. [4–6]. High mechanical strength and toughness are first required for these applications. Unfortunately, most neat PDMS based materials usually show poor mechanical properties, which makes them more likely to damage in their service life and limits their practical applications. To address this problem, people have tried to design PDMS materials capable of healing themselves or recycling their wastes [7– 11]. Nevertheless, self-healing materials often involve in *

Corresponding authors (email: [email protected]; [email protected])

weak dynamic bonds and their mechanical properties are often compromised. Mechanically strong and tough selfhealing materials are urgently desired but the preparation still a challenge. Regarding to robust and tough self-healing materials, many design strategies have been proposed and demonstrated. The most common approach is to introduce nanoparticles. However, the introduction of nanoparticles involves complicated process of modification and dispersion and has been confirmed to reduce polymer chain mobility, thus decreasing the se