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Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites

Authorized Users Only
2017
Authors
Nikolic, Marija S.
Petrovic, Rada
Veljović, Đorđe
Ćosović, Vladan
Stankovic, Nadezda
Đonlagić, Jasna
Article (Published version)
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Abstract
Poly(epsilon-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using ionic exchange. In order to reveal the influence of the organomodification on the nanoclay dispersion and the properties of the nano composites XRD, DSC, TG, SEM, TEM, optical microscopy, melt rheology and dynamic-mechanical analyses were performed. A better dispersion was achieved when organomodified sepiolites instead of native ones were used as fillers. As deduced from the melt rheology data, by analysis of the Cole-Cole plots, the best dispersion was obtained for SEP-SI nanoclay. The thermal stability was not improved, however in the initial stages of the thereto-oxidative degradation a delay in the weight loss was observed for nanocomposites with organomodified sepiolites. The mechanica...l properties of the nanocomposites were improved in comparison to PCL, particularly for those with modified sepiolites. In terms of mechanical properties the use of sepiolite modified with HDA gave the best results, as a consequence of better interaction between longer alkyl hydrophobic part of the organic modificator and the hydrophobic PCL matrix.

Keywords:
Sepiolite / Poly(epsilon-caprolactone) / Biodegradable / Nanocomposite
Source:
European Polymer Journal, 2017, 97, 198-209
Publisher:
  • Pergamon-Elsevier Science Ltd, Oxford
Projects:
  • Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)
Note:
  • The peer-reviewed version: http://cer.ihtm.bg.ac.rs/handle/123456789/2941

DOI: 10.1016/j.eurpolymj.2017.10.010

ISSN: 0014-3057

WoS: 000419415800021

Scopus: 2-s2.0-85031711347
[ Google Scholar ]
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2104
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