文献类型：期刊文献

英文题名：Poly(L-lactide) nanocomposites containing octaglycidylether polyhedral oligomeric silsesquioxane: Preparation, structure and properties

作者：Zou, J.[1,2];Chen, X.[1];Jiang, X. B.[1];Zhang, J.[1];Guo, Y. B.[1];Huang, F. R.[1]

机构：[1]E China Univ Chem Technol, Sch Mat Sci & Engn, Minist Educ, China Key Lab Specially Funct Polymer Mat & Relat, Shanghai 200237, Peoples R China;[2]Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Jiangsu, Peoples R China

年份：2011

卷号：5

期号：8

起止页码：662

外文期刊名：EXPRESS POLYMER LETTERS

收录：;EI(收录号：20123215320961);WOS:【SCI-EXPANDED(收录号:WOS:000291045900002)】；

基金：The work was financially supported by The Key Technology R&D Program of Jiangsu (Project No. BE2010176), Natural science fund for colleges and universities in Jiangsu Province (Project No. 08KJB430004), Scientific and Technological Developing Scheme of Zhenjiang City (Project No. SH2008073).

语种：英文

外文关键词：nanocomposites; poly(L-lactide); octaglycidylether POSS; hybrid PLLA

摘要：Poly(L-lactide)s (PLLA) tethered with octaglycidylether polyhedral oligomeric silsesquioxane (OPOSS) with contents of 0.02-1.00 mol% were successfully prepared by solution ring-opening polymerization of L-lactide in the presence of Sn(Oct)(2) catalyst. Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1)H-NMR spectroscopic techniques confirm the formation of secondary hydroxyls due to the reaction between PLLA main chains and OPOSS cages. X-ray analyses prove that the presence of OPOSS does not alter the packing structure of PLLA chain in the crystals but enhances the crystallinity of PLLA hybrids. PLLA/PLLA-OPOSS nanocomposites with PLLA-OPOSS contents of 1-30 wt% were prepared by solution-mixing of the neat PLLA polymer with various contents of the PLLA-OPOSS hybrid with 0.50 mol% OPOSS. It is found that the glass transition temperature of the PLLA/PLLA-OPOSS nanocomposites remains the same as that of pristine PLLA and the thermooxidative stability of the nanocomposites is improved with the PLLA-OPOSS content of 1-20 wt%, as compared to that of the neat PLLA polymer. PLLA/PLLA-OPOSS nanocomposites, except for PLLA/PLLA-OPOSS(1), has higher crystallization rate at 120 degrees C. The nucleation density increases with increase in the content of PLLA-OPOSS.