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Fracture toughness analysis of O-POSS/PLA composites assessed by essential work of fracture method
Affiliation:1. Department of Mechanical Engineering, Kocaeli University, Umuttepe 41380, Kocaeli, Turkey;2. Department of Chemical Engineering, Kocaeli University, Umuttepe 41380, Kocaeli, Turkey;1. Faculty of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran;2. Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran;1. School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand;2. Materials for Energy and Environment (MEE) Research Group, Mae Fah Luang University, Chiang Rai 57100, Thailand;3. School of Engineering and Materials Science, and Materials Research Institute, Queen Mary University of London, Mile End Road, E1 4NS London, UK;4. Nanoforce Technology Ltd., Joseph Priestley Building, Queen Mary University of London, Mile End Road, E1 4NS London, UK;1. Institute of Nano- and Bio-polymeric Materials, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Material Science and Engineering, Tongji University, Shanghai 201804, China;2. KINGFA SCI.& TECH. CO.,LTD, Guangzhou 510663, China;1. Materials Engineering Division, Universidade Tecnológica Federal do Paraná, Av. dos Pioneiros 3131, Londrina - PR, CEP 86036-370, Brazil;2. Materials Engineering Department, Escola de Engenharia de São Carlos, Trabalhador Sãocarlene 400, São Carlos - SP, CEP 13566-590, Brazil;3. Department of Metallurgical and Materials Engineering, Escola Politécnica da Universidade de SãoPaulo, Av. Prof. MelloMoraes 2463, SãoPaulo - SP, São Paulo, CEP05580-900, Brazil
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.
Keywords:A  Polymer–matrix composites (PMCs)  B  Fracture toughness  D  Fractography  D  Mechanical testing  POSS
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