Abstract
Slide-ring (SR) gels cross-linked by ring molecules are characterized by softness (low Young’s modulus), elasticity (low hysteresis loss), and toughness (large fracture energy). In this article, the mechanical and fracture properties of SR gels are reviewed to clarify the physical understanding of the relationship between the molecular-level sliding dynamics of the slide-ring cross-links and macroscopic properties of SR gels. The low Young’s modulus and large fracture energy of SR gels are expressed by simple equations as a function of the degree of sliding movement. The dynamic fracture behaviors of SR gels gives us the time scale of the sliding dynamics of the cross-links, which is at the micro-sec scale. The fast sliding motion of the cross-links leads to the elasticity of the SR gels. The SR concept can be applied to solvent-free elastomers and composite materials.
Highlights
The cross-linking of polymers is an important process for improving the mechanical elasticity, toughness, and stability of polymeric elastomers
The dynamic rupture of the physical cross-links results in residual strains and mechanical hysteresis under repeated cyclic deformation [16,17]. Realizing both high elasticity and toughness is a challenging issue for the material design of polymeric elastomers
We reviewed the mechanical/fracture properties of SR gels with movable cross-links and discussed the molecular origins of their softness, elasticity, and toughness
Summary
The cross-linking of polymers is an important process for improving the mechanical elasticity, toughness, and stability of polymeric elastomers. For SR gels, the strand length at the crack tip is enlarged by sliding of the cross-linking points (Figure 11b,c). The fracture energy of SR gels is independent of the Young’s modulus, suggesting that the slidable distance of the cross-links does not depend on the cross-linking density. In order to enhance the toughness of SR gels, the slidable distance of the cross-links is enl3a0rged by increasing the PEG chain length [23] and decreasing the CD coverage on PEG chains [28]. FFigiguurere1144. .GGrraayy ssccaallee pphhoottooss aanndd rreettaarrddaattiioonnmmaappssooff(a(a))SSRRggelelwwitihth252%5%CDCDcocvoevreargaegaenadn(db)(bS)R SgRegl ewliwthit2h%2%CDCcDovcoervaegreagdeudriunrgincgraccrkacpkroppraogpaatgioanti.oRne. pRreipntreindtefrdomfro[m29[]2w9]itwh iptherpmeirsmsiiosnsifornomfroImOP IOScPieSnccie.nce
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
