Studies Of Designed Supramolecular Intercalation Structure And UV Blocking Properties

The component of Layered double hydroxides (LDHs) has great effect on the structure of guest anion. It could change the structure of interlayer anion to modify the properties of materials. So we can take full advantage of confinement effect and host-guest interaction and design novel supramolecular structure UV blocking materials which can be used to improve the anti UV aging performance of bitumen. It has great theoretical and practical application value to the development of supramolecular intercalation structure functional materials and improvement the service life of bitumen Pavement.In this thesis, PPN was intercalated in the different layer of LDHs by the ion exchange method. PPN has equilibrium of lactone and quinoid structure. Use XRD, FT-IR,13C NMRand UV-vis analysis to study the process of structure change and influence on UV absorption.The research shows that PPN is lactone structure before intercalated.Whereas the main structure of PPN is quinoid structure in the layer of LDHs. There is also less amount of lactone structure and PP(OH)3-. The confinement effect of LDHs could provide alkaline environment and move the equilibrium to the quinoid side. The quinone structure has a larger conjugate structure, so the PPN-LDHs have great improvement in UV-Vis absorption and wide UV absorption range. The component of layer can move the equilibrium. The performance UV absorption property:MgAl-PPN-LDHs > CoAl-PPN-LDHs > CaAl-PPN-LDHs.MgAl-PPN-LDHs were mix into the bitumen to produce modified bitumen.After ageing, test results of modified bitumen are VAI 10.4%, ?S 1.0?.Comparing with base bitumen VAI (36.0%) and ?S (4.25?), it decreased 71% and 76%respectively.CCA, which can form hydrogen bonds with LDHs, and CFB, which cannot form hydrogen bonds, were inserted into the layer of LDHs. Use XRD , FT-IR and UV-vis analysis to study the the Host-Guest interactions between layer and CCA. The research shows that the vibrational peaks of carbonyl groups in CCA are quite different in different LDHs, because carbonyl groups form the hydrogen bonds with the layer of LDHs. The stronger the hydrogen bond, the lower the absorption intensity in the visible region. This may be due to CCA and LDHs layer hydroxyl hydrogen bonding interactions increase, reduce the number of intermolecular hydrogen bonds, resulting in the decrease of absorption intensity in the visible light region. The vibrational peak of sulfonic acid groups is almost unchanged, because it can't form hydrogen bonds with LDHs. The hydrogen bond of the host and guest has a great influence on UV-Vis absorption of CCA-LDHs in different layers and less on CFB-LDHs. Due to the interaction of CCA and layer of LDHs, the thermal stability of CCA-LDHs has greatly enhance, about 200 ?. MgAl-CCA-LDHs and MgAl-CFB-LDHs were mix into the bitumen respectively to produce modified bitumen. After ageing, test results of MgAl-CCA-LDHs modified bitumen are VAI 18.4% andAS 2.5 ?. Comparing with base bitumen VAI and ?S, it decreased 51% and 59%respectively. MgAl-CFB-LDHs are VAI 17.1% and ?S 2.5 ?and 2.05 ?. Comparing with base bitumen VAI and ?S, it decreased 53% and 52 % respectively.In this thesis, we develop kinds of novel intercalated structure UV blocking materials which have remarkable UV absorption property. It also enriches the supramolecular intercalation structure theory and provides new research ideas and methods for the new material.