Preparation and properties of diolefin rubber based on dynamically reversible bonding crosslinking

Abstract

Endowing polymers with self-healing properties holds great promise for extending the life of materials and reducing environmental pressure. However, it is still a challenge to have both mechanically enhanced and selfhealing properties. Dynamic reversible bonds can be broken and regenerated in response to external stimuli, thereby repairing localized cracks in the rubber matrix during use. Click reaction is an efficient and facile way to prepare self-healing rubbers with dynamic reversible bonds. Herein, we have obtained a self-healing styrene-butadiene rubber (SBR) (SLA) by introducing dynamic disulfide and hydrogen bonds in an "imitative" click reaction via using SBR as a model compound and lipoic acid (LA) as the cross-linking agent. The mechanical properties and self-healing capacity of SLA can be altered by adjusting the LA content. Furthermore, SLA-Zn was further prepared by introducing Zn 2+ to form metal-oxygen coordination bonds with carboxyl groups. The effect of Zn 2+ on the mechanical and self-healing properties has been systematically investigated. Compared with SLA, SLA-Zn has better mechanical properties and self-repairing ability, with a tensile strength up to 3.85 MPa and a repair efficiency of about 76%. This facile preparation method paves the way for the development of low-cost self-healing diolefin rubbers.

Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

“…[8][9][10] This self-healing asphalt without the use of microwave heating and microcapsule technology has the advantages of energy conservation, repeatability, and efficient healing. 11,12 Previous research focused on the impact of dynamic chemical bonds on the self-healing performance of asphalt, while neglecting the rheological properties of this polymer modified asphalt. 13 The rheological properties of asphalt directly affect the high-and low-temperature performance and fatigue resistance of asphalt pavement during service.…”

“…Polyurethane (PU) modifiers containing dynamic chemical bond (disulfide bond or selenium bond) have been proved to be able to effectively improve the self‐healing ability of asphalt binder 8–10 . This self‐healing asphalt without the use of microwave heating and microcapsule technology has the advantages of energy conservation, repeatability, and efficient healing 11,12 . Previous research focused on the impact of dynamic chemical bonds on the self‐healing performance of asphalt, while neglecting the rheological properties of this polymer modified asphalt 13 .…”

Self‐healing corrosion‐resistant coatings based on fluorinated alkyl silane microcapsules

“…Internal self-healing requires the remodeling ability of polymers under the action of external stimuli such as heat, UV light, and so forth. [9][10][11][12] However, the high price of functional materials as matrix in the internal self-healing method limits their widespread use. [13] Therefore, the external selfhealing method has developed rapidly with the introduction of microcapsules and vascular network.…”