Smart rubber is a polymeric material that is able to "heal" when torn. Near room temperature this process is reversible and can be cycled several times. Supramolecular self-healing rubber can be processed, re-used, and ultimately recycled. The edges of a tear can be held together, and they will simply re-bond into apparent solidity. This is done by utilizing a hydrogen-bonding polymer, rather than producing a material whose structure would depend on covalent bonding and ionic bonding between chains, which is typical of normal rubber. In this case hydrogen bonding can occur simply by pressing two faces of the substance together, allowing the recovery of a continuous hydrogen bonding network.
Hydrogen Bonding Network
Smart rubber will recover its original mechanical strength within several hours of being split and them subsequently recombined. Residual hydrogen bond donors and acceptors responsible for the self-healing properties of the elastomer remain unpaired until the newly exposed surface comes in contact with another complimentary surface, allowing formation of new intermolecular hydrogen bonds.
Comparisons with Conventional Rubber
When compared to rubber, which is covalently cross-linked, smart rubber cannot continually hold mechanical stress without undergoing gradual plastic deformation, and strain recovery is typically slow.
References
Hydrogen Bonding Network
Smart rubber will recover its original mechanical strength within several hours of being split and them subsequently recombined. Residual hydrogen bond donors and acceptors responsible for the self-healing properties of the elastomer remain unpaired until the newly exposed surface comes in contact with another complimentary surface, allowing formation of new intermolecular hydrogen bonds.
Comparisons with Conventional Rubber
When compared to rubber, which is covalently cross-linked, smart rubber cannot continually hold mechanical stress without undergoing gradual plastic deformation, and strain recovery is typically slow.
References
- "Smart rubber promises self-mending products. newscientist.com. Retrieved July 15,2012.
- Montarnal, Damien; Cordier, Philippe; Soulié-Ziakovic, Corinne; Tournilhac, François; Leibler, Ludwik (15 December 2008). "Synthesis of self-healing supramolecular rubbers from fatty acid derivatives, diethylene triamine, and urea". Journal of Polymer Science Part A: Polymer Chemistry 46 (24): 7925–7936. doi:10.1002/pola.23094.
- Montarnal, Damien; Tournilhac, François; Hidalgo, Manuel; Couturier, Jean-Luc; Leibler, Ludwik (17 June 2009). "Versatile One-Pot Synthesis of Supramolecular Plastics and Self-Healing Rubbers". Journal of the American Chemical Society 131 (23): 7966–7967. doi:10.1021/ja903080c.
- Wietor, Jean-Luc; Sijbesma, Rint P. (13 October 2008). "A Self-Healing Elastomer". Angewandte Chemie International Edition 47 (43): 8161–8163. doi:10.1002/anie.200803072.
- Wikipedia
No comments:
Post a Comment