Influence of a hindered amine stabilizer on optical and mechanical properties of poly(methyl methacrylate) exposed to gamma irradiation

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Kátia Aparecida S. Aquino ◽  
Elmo S. Araújo ◽  
Selma Matheus L. Guedes
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Gamma Irradiation ◽  
Poly Methyl Methacrylate ◽  
Optical And Mechanical Properties ◽  
Hindered Amine Stabilizer

Electrical, mechanical, and optical changes in MWCNT-doped PMMA composite films

2020 ◽  
Vol 54 (18) ◽  
pp. 2449-2459
Author(s):  
Ömer Bahadır Mergen ◽  
Ertan Arda ◽  
Gülşen Akın Evingür
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Scattered Light ◽  
Ultrasonic Method ◽  
Composite Films ◽  
Tensile Modulus ◽  
Mwcnt Content ◽  
Poly Methyl Methacrylate ◽  
Electrical Percolation ◽  
Optical And Mechanical Properties

In this study, we report the preparation of poly (methyl methacrylate)/multi-walled carbon nanotube (MWCNT) composite thin films by simple and efficient solution mixing and ultrasonic method and the electrical, optical, and mechanical characterizations. Scattered light intensity ( I sc), tensile modulus ( E), and surface conductivity ( σ) of these composites have increased with the addition of MWCNT into the composite. The observed behavior in electrical, optical, and mechanical properties of the poly (methyl methacrylate)/MWCNT composites was interpreted by site and classical percolation theory. The optical mechanical and electrical percolation thresholds of poly (methyl methacrylate)/MWCNT composites were determined as φ op = 3 wt%, φ m = 0 wt%, and φσ = 5 wt%, respectively. The optical ( t op), mechanical ( t m), and electrical ( t σ) critical exponents were calculated as 2.23, 0.43, and 0.11, respectively. Both the tensile modulus and tensile strength of poly (methyl methacrylate)/MWCNT composites were increased with increasing MWCNT content until it reaches to 10 wt%. However, above φ = 10 wt%, the mechanical properties of the composites were decreased due to the aggregation of MWCNTs, while the toughness does not show a significant change until φ = 10 wt% MWCNT content, whereas it was decreased above this value.

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