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Post-yield fracture behaviour of PA-6/LDPE-g-MA/nanoclay ternary nanocomposites: semiductile-to-ductile transition

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Abstract

Melt-mixed ternary nanocomposites of PA-6/LDPE-g-MA/organoclay, (CloisiteTM 30B) with microscopically confirmed flocculated-intercalated morphology have been evaluated for their plane-stress fracture and failure-modes following essential work of fracture (EWF) approach. The damping properties (tan δ) revealed nanoclay-induced chain mobility restrictions causing an increase in Tg of the nanocomposites by ~5–12 °C relative to the neat PA-6 and by ~12–21 °C relative to the optimized impact modified PA-6 matrix. A reduction in area-controlled EWF (w e : energy dissipated in the fracture plane) value was observed with 6 wt. % of nanoclay indicating a decreased resistance to crack initiation whereas a sharp-rise in the volume-controlled fracture-parameter, i.e. non-EWF (βw p ) by ~108 % of the composite with 4wt.-% of nanoclay loading compared to optimized PA-6 blend matrix (NLC0) showed enhanced ductility and resistance to crack propagation. A semiductile-to-ductile transition (STD) was observed in the composition range of 2–4 wt. % of nanoclay loading which is also supported by a systematic transition in the nature of deformation mode as indicated from fracture surface morphology.

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Acknowledgment

Mr. Naresh Dayma gratefully acknowledges the Senior Research Fellowship awarded by University Grants Commission, New Delhi, India to carry out this work.

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Authors and Affiliations

  1. Centre for Polymer Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Naresh Dayma, Harjeet S. Jaggi & Bhabani K. Satapathy

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  1. Naresh Dayma
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  2. Harjeet S. Jaggi
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  3. Bhabani K. Satapathy
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Correspondence to Bhabani K. Satapathy.

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Dayma, N., Jaggi, H.S. & Satapathy, B.K. Post-yield fracture behaviour of PA-6/LDPE-g-MA/nanoclay ternary nanocomposites: semiductile-to-ductile transition. J Polym Res 19, 38 (2012). https://doi.org/10.1007/s10965-012-0038-8

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