Spacial Confined Intercalation And Supramolecular Interaction Of UV Blocking Materials In Intercalated Structure

Layered double hydroxides are a new class of functional materials with the host-guest layered structure. Specific functional object under supramolecular effect, will produce conformational transition and regular arrangement in confined space, resulting in new features or greatly improving the performance of the material. To study the confinement assembly of functional objects and its effect on anti-UV aging properties of asphalt and other materials, it has great theoretical and practical application value.In this thesis, we design the material molecular by LDHs space confinement effect and the ion exchange method. Three kinds of intercalated structure UV-blocking material MgAl-PPN-LDHs, MgAl-PSPN-LDHs and MgAl-PNPL-LDHs have been got by intercalating PPN, PSPN and PNPL into confinement layers of MgAl-LDHs. XRD test shows that the three guest molecules have been intercalated completely. FT-IR and 13C MAS NMR analysis show that in the supramolecular effect, organic objects change their conformation in the confinement space, resulting in a quinone-type structure with a large conjugated structure. UV-vis DRS show the average UV absorption rate of intercalated structure UV-blocking materials in 220-400nm band can reach about 96%. TG-DTA tests show under the host-guest supramolecular effect thermal stability of intercalated objects have been enhanced:PPN exothermic decomposition peak is increased from 354℃ to 440, and the melted phase change does not occur; PSPN exothermic decomposition peak is increased from 318℃ to 409℃; PNPL exothermic decomposition peak is at 369℃ and no melting and sublimation phase transition occur. Three intercalation products mix into the bitumen respectively with 3 wt% of the added amount and their UV aging capacity have been significantly improved.It is shown that the specific functional objects are intercalated into LDHs layer by assembling method. Specific functional object will produce conformational transition in the confinement space. The resulting in a large conjugated structure makes anti-UV properties of the materials improve greatly. Series of excellent UV-blocking functional material have been obtained. Our research provides new research ideas for confinement assembly of LDHs-like materials and development of relevant functional materials with supramolecular structure.