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

作者：Dayma Naresh; Jaggi Harjeet S; Satapathy Bhabani K^*

来源：Journal of Polymer Research, 2012, 19(12): 38.

DOI：10.1007/s10965-012-0038-8

• Polymer
• Fracture
• Toughness
• Microstructure
• Deformation

Melt-mixed ternary nanocomposites of PA-6/LDPE-g-MA/organoclay, (Cloisite (TM) 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 delta) revealed nanoclay-induced chain mobility restrictions causing an increase in T-g of the nanocomposites by similar to 5-12 degrees C relative to the neat PA-6 and by similar to 12-21 degrees 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 (beta w(p)) by similar to 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.

• 出版日期2012-12