A nanosheets-polyborosiloxane composite impregnated with shorter hydrogen-bonding clusters achieves combination of self-healing, shapeability and high-barrier properties. (21st July 2022)

• Record Type: Journal Article
• Authors: Zhao, Zhiyu; Xie, Heping; Yang, Dongsheng; Wu, Yifan; Tang, Wenbin; Zhu, Liangyu; Liu, Wei; Liu, Tao
• Is Part Of: Polymer. Volume 254(2022)
• Publication Date: 2022-07-21
• Subjects: MMT nanosheets -- Self-healing -- Barrier -- Shapeability -- Shorter hydrogen-bonding cluster; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2022.125013
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Self-healing polymers have been extensively studied, however, challenges remain in cooperating processability and functionality for practical applications. Here, we present a facile method to fabricate a nanocomposite by constructing intercoupling short hydrogen-bonding clusters between polyborosiloxane (PBS) and l -cystine modified MMT nanosheets (LMMT) to produce both weak entanglement and interfacial interaction. At ambient conditions, the resultant nanocomposite simultaneously achieves preferable rheological dynamics, short self-healing time and higher self-healing efficiency (∼99.48% in 10 min), remarkable barrier properties (water vapor permeability ∼4.74 × 10 −11 g m/(m 2 ·s·pa)) even after repeated damage-healing cycles, which overturns the previous understanding of conventional self-healing composites where self-healing, shapeability and high-barrier performances are mutually exclusive. Moreover, such nanostructure characterize enables the self-sealing ability applying in the substance-preserving function. This work provides fundamental insight for designing and developing multi-function materials for self-sealing packaging application. Graphical abstract: Image 1 Highlights: Facile preparation method of PBS/LMMT composite combined with room-temperature shapeability, self-healing and barrier properties. Shorter hydrogen-bond cluster of LMMT results in improving a stable interfacial interaction and creating a weak entanglement. The short layer spacing of LMMT endows the composites with room-temperature formability. Providing a newly method and material of in-situ self-sealing for substance-preserving packaging.