Preparation of Poly ( L-lactic acid ) / Vermiculites Composites by in situ Copolymerization of Lactic Acid and Hydroxylic Vermiculites  

作　　者：徐红 刘欢 马辉 钟毅 毛志平 

机构地区：[1]Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University

出　　处：《Journal of Donghua University(English Edition)》2012年第4期326-330,共5页东华大学学报（英文版）

基　　金：National High-Tech Research and Development Program of China ( 863 Program ) ( No. 2007AA03Z336) ;Program for New Century Excellent Talents in University,China ( No. NCET-07-0174) ;National Natural Science Foundations of China ( No. 21074021,No.50673018) ;The Fundamental Research Funds for the Central Universities ( No. 2011D10543)

摘　　要：L-lactic acid (L-LA) based copolymer/hydroxylation vermiculites composites (PLLA-co-bis A/HVMTs) were prepared by in situ reaction among L-LA, adipic acid, and hydroxylation lamellar vermiculites (HVMTs) using bisphenol-A epoxy resin as chain extending agent. HVMTs were obtained by sulfuric acid-leaching of lamellar vermiculites (VMTs). The effects of sulfuric acid leaching on the VMTs structure were characterized by X-ray diffraction (XRD), 29Si magic-angle spinning nuclear magnetic resonance(29Si NMR), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and thermogravimetric analysis (TGA). FTIR, FE-SEM, and TGA were used to characterize the reaction activity of HVMTs. The results indicated that VMTs with increased hydroxyl groups had been successfully obtained and could react with -COOH of the reaction system. The amount of L-LA based copolymer grafted on the surface of HVMTs was more than 22%. The onset decomposition temperature of L-LA based copolymer grafted on the surface of HVMTs was 30℃ higher than that of free L-LA based copolymer.L-lactic acid （L-LA） based copolymer/hydroxylation vermiculites composites （PLLA-co-bis A/HVMTs ） were prepared by in situ reaction among L-LA, adipic acid, and hydroxylation lamellar vermiculites （HVMTs） using bisphenoI-A epoxy resin as chain extending agent. HVMTs were obtained by sulfuric acid. leaching of lamellar vermiculites （VMTs）. The effects of sulfuric acid leaching on the VMTs structure were characterized by X-ray diffraction （XRD）, 29Si magic-angle spinning nuclear magnetic resonance （29Si NMR ）, Fourier transform infrared spectroscopy （FTIR）, field emission scanning electron microscopy （FE-SEM）, and thermogravimetric analysis （TGA）. FTIR, FE-SEM, and TGA were used to characterize the reaction activity of HVMTs. The results indicated that VMTs with increased hydroxyl groups had been successfully obtained and could react with--COOH of the reaction system. The amount of L-LA based copolymcr grafted on the surface of HVMTs was more than 22%. The onset decomposition temperature of L-LA based copolymer grafted on the surface of HVMTs was 30℃ higher than that of free L-LA based copolymer.

关 键 词：L-lactic acid(L-LA) based copolymer vermiculites in situ reaction COMPOSITES 

分 类 号：O63[理学—高分子化学]