Journal
EUROPEAN POLYMER JOURNAL
Volume 55, Issue -, Pages 48-56Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2014.03.005
Keywords
Polypropylene; Layered Double Hydroxide; Nanocomposites; Temperature Modulated Differential; Scanning Calorimetery; Dielectric spectroscopy; Rigid amorphous fraction
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Funding
- BAM Federal Institute for Materials Research and Testing through the BAM PhD program
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Polymer based nanocomposites by melt blending of synthesized ZnAl-Layered Double Hydroxide (ZnAl-LDH) and polypropylene (PP) were investigated by temperature modulated differential scanning calorimetry (TMDSC). The LDH was organically modified by using a surfactant, sodium dodecylbenzene sulfonate (SDBS) to increase the interlayer spacing of the LDH, so that polymer segments can intercalate the inter layer galleries. The glass transition temperature (T-g) and the thermal relaxation strength (Delta C-p) were determined. The Tg remains constant for concentration till 12 wt% of LDH and a slight reduction of 3 K might be observed for 16 wt% LDH but within the experimental error. The thermal relaxation strength decreases indicating reduction in the amount of mobile polymer segments from amorphous fraction. This finding is supported by the increase in the rigid amorphous fraction (RAF) which is attributed to the polymer molecules which are in close proximity to the crystals and the LDH sheets, as they hinder their mobility. This is analyzed in detail and related to the dielectric relaxation spectroscopy (BDS) results. (C) 2014 Elsevier Ltd. All rights reserved.
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