Fracture toughness analysis of O-POSS/PLA composites assessed by essential work of fracture method


YILMAZ S., KODAL M., YILMAZ T., ÖZKOÇ G.

COMPOSITES PART B-ENGINEERING, vol.56, pp.527-535, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 56
  • Publication Date: 2014
  • Doi Number: 10.1016/j.compositesb.2013.08.081
  • Journal Name: COMPOSITES PART B-ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.527-535
  • Keywords: Polymer-matrix composites (PMCs), Fracture toughness, Fractography, Mechanical testing, POSS, POLYHEDRAL OLIGOMERIC SILSESQUIOXANE, STRESS ESSENTIAL WORK, EWF METHOD, MECHANICAL-PROPERTIES, THERMAL-PROPERTIES, NANOCOMPOSITES, POLYMERS, FILMS, PLA, PET
  • Kocaeli University Affiliated: Yes

Abstract

Essential work of fracture (EWF) method was employed to investigate the effect of the octavinylisobutyl based polyhedral oligomeric silsesquioxane (O-POSS) addition in poly(lactic acid) (PLA) matrix on the fracture behavior of O-POSS/PLA composites. The 2 mm thick rectangular shaped PLA-matrix composites containing various weight ratios of O-POSS were injection molded after processing in a twin-screw extruder. Constant deformation rate tensile tests at room temperature were performed on double edge notched tensile (DENT) specimens with various ligament lengths. It was found that the addition of O-POSS to PLA improved the toughness. It was observed that a greater energy consumed after the maximum load reached on load-displacement curves for the composites. Optimum additive value was obtained at 7 wt% O-POSS. (C) 2013 Elsevier Ltd. All rights reserved.