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On the Effect of Nanofillers on the Environmental Stress Cracking Resistance of Glassy Polymers

Polycarbonate (PC), polystyrene (PS) and poly(methyl methacrylate) (PMMA) nanocomposites containing different amounts and sizes of nano-SiO2 particles were prepared using a twin-screw extruder followed by injection molding. Adding a small amount of nano-SiO2 caused a reduction in material transparency but improved the tensile, toughness, and thermal properties of the polymer nanocomposites due to an adequate level of nano-SiO2 particle distribution within the polymer matrix. This was particularly in the case with the smaller sized nano-SiO2 , which not only significantly improved mechanical properties but also preserved optical properties of the nanocomposites. Interestingly, the incorporation of nano-SiO2 greatly enhanced the ESC resistance of the materials in all investigated fluids, particularly for smaller sizes nano-SiO2 . The enhancement in ESC resistance was more effective in mild agents and air, where the quality of the deformation process was vastly altered with the presence of nano-SiO2 . For a comparison of different materials, the ESC resistance improved in the following order: PMMA/SiO2 < PS/SiO2 < low molecular weight PC/SiO2 < high molecular weight PC/SiO2 . In most cases, nanocomposites with 1 vol.% of nano-SiO2 exhibited the largest improvement in ESC resistance. The correlation of the critical stress intensity factor with the Hansen solubility parameter and molar volume of the agent shows a very good agreement for different fluids, thus allowing to predict the risk of stress cracking in different fluids without performing extensive tests. Moreover, an accelerated ESC-testing in aggressive agent and/or elevated temperature as well as a modified superposition approach have been developed for predicting the slow crack growth behavior, allowing to minimize the test time and the great expense for stress-cracking tests. Additionally, the modeling and simulation of diffusion processes linked to the structural fracture model can be applied for quick screening and mitigating the risk of ESC failures in plastic products.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Jiraporn Nomai

Jiraporn Nomai
Fakultät für Maschinenbau und Verfahrenstechnik
Technische Universität Kaiserslautern

Information

Free keywords: Amorphous polymer, Polymer nanocomposites, Process-structure-property relationships, Environmental stress cracking resistance, Fracture behavior
Institute / chair: Fakultät für Maschinenbau und Verfahrenstechnik der Technischen Universität Kaiserslautern
Language: English
Technical consultant for expert services: Professor Dr.-Ing. Alois K. Schlarb, Professor Dr.-Ing. Volker Altstädt
Publication year: 2019
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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