Structure-property relationships of nanocomposites based on polylactide and MgAl layered double hydroxides
作者： Jing Leng , Purv J. Purohit , Nianjun Kang , De-Yi Wang , Jana Falkenhagen
DOI: 10.1016/J.EURPOLYMJ.2015.05.008
关键词:
摘要: Abstract Nanocomposites based on poly( l -lactide) (PLA) and organically modified MgAl Layered Double Hydroxides (MgAl-LDH) were prepared by melt blending investigated a combination of Differential Scanning Calorimetry (DSC), Small- Wide-Angle X-ray Scattering (SAXS, WAXS), dielectric spectroscopy (BDS). microfocus SAXS investigations show that the MgAl-LDH is homogeneously distributed in matrix as stacks 6 layers and/or partly exfoliated layers. DSC WAXS degree crystallinity decreases linearly with content LDH. The extrapolation dependencies (DSC WAXS) to zero estimates limiting concentration LDH C Cri ca. 21 wt% where crystallization PLA completely suppressed nanofiller. behavior neat two relaxation regions, β-relaxation at low temperatures related localized fluctuations α-relaxation higher due dynamic glass transition. spectra nanocomposites several additional processes compared which are discussed detail. For around 260 K ( f = 1 kHz) an process observed intensity increases increasing This mainly attributed exchanged dodecylbenzene sulfonate (SDBS) molecules adsorbed form mixed phase polymer close stacks. An analysis this provides information about molecular dynamics interfacial region between reveal glassy region. In temperature range 310 K further observed. Its rate has unusual saddle-like dependence. It was assigned rotational water nanoporous environment provided filler. Above transition above. Maxwell/Wagner/Sillars polarization blocking charges
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