Prepared And Property Study On Super Molecular Structure Of Oganic UV Absorber Intercalated LDHs

Three organic UV absorber has been intercalated into a layered double hydroxide (LDHs) host by ion-exchange method using ZnAl-NO3-LDHs as precursor with an aqueous solution of the sodium salt of 5-benzotriazolyl-4-hydroxy-3-sec-butylbenzenesulfonic acid (BZO), 2-Phenylbenzimidazole-5-Sulfonic Acid(PBSA) and 2,2'-Dihydroxy 4,4'-Dimethoxy Benzophenone 5,5'-Disodium Sulfonate (DBDS). After intercalation of the UV absorber, the interlayer distance in the LDHs increases from 0.89 to 2.32 nm for ZnAl-BZO-LDHs, 2.71 nm for ZnAl-PBSA-LDHs and 1.83 for ZnAl-DBDS-LDHs. Infrared spectra and TG-DTA curves reveal the presence of a complex system of supramolecular host-guest interactions.The thermostability of BZO, PBSA and DBDS is markedly enhanced by intercalation in the LDHs host. The decomposition temperature of BZO was increases from 250 °C to 450 °C after intercalated into LDHs.ZnAl-BZO-LDHs/polypropylene, ZnAl-PBSA-LDHs/polypropylene and ZnAl-DBDS-LDHs/polypropylene composite materials exhibit excellent UV photostability. The UV absorption capability of ZnAl-PBSA-LDHs was...