聚乳酸/改性水滑石吹塑薄膜的制备工艺及其紫外老化行为研究OA北大核心

Using Mg2+,Al3+and Ce3+nitrate as the raw materials,layered double hydroxides(LDHs)were synthesized via the co-precipitation method.Sodium dodecyl sulfate(SDS)was used as an intercalating agent to prepare organically modified layered double hydroxides(LDHs-SDS).Structural characterization showed that the contact angle of LDHs-SDS was increased from 30.0° to 107.7°.XRD analysis results showed that the layer spacing of LDHs-SDS was increased by 0.3 nm.FTIR analysis was consistent with XRD results.Then poly(lactic acid)(PLA)/LDHs-SDS blown molding film was prepared with LDHs-SDS as additives,and its properties and ultraviolet aging behavior were studied.The results showed that the elongation at break of PLA films could be significantly increased when the mass fraction of LDHs-SDS was 0.5％.DSC analysis showed that the crystallization properties of PLA films were improved due to the heterogeneous nucleation of LDHs-SDS.The UV shielding test showed that the addition of LDHs-SDS enhanced the UV shielding property of PLA film.The results of UV aging showed that PLA3 film had remarkable UV aging resistance compared with PLA0,and its aging kinetics fitting conformed to the second-order reaction kinetics model.