NDLI: Influence of Sample Preparation and Processing on Observed Glass Transition Temperatures of Polymer Nanocomposites

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Influence of Sample Preparation and Processing on Observed Glass Transition Temperatures of Polymer Nanocomposites

Content Provider	Semantic Scholar
Author	Hub, Chenming Harton, Shane E. Hunt, Marcus A. Fink, Rainer Ade, Harald W.
Copyright Year	2007
Abstract	Polymer composites composed of poly(methyl methacrylate) (PMMA) and silica (14 nm diameter) have been investigated. The influences of sample preparation and processing have been probed. Two types of sample preparation methods were investigated: (i) solution mixture of PMMA and silica in methyl ethyl ketone and (ii) in situ synthesis of PMMA in the presence of silica. After removing all solvent or monomer, as confirmed using thermogravimetric analysis, and after compression molding, drops in Tg of 5–15 8C were observed for all composites (2–12% w/w silica) and even pure polymer reference samples. However, after additional annealing for 72 h at 140 8C, all previously observed drops in Tg disappeared, and the intrinsic Tg of bulk, pure PMMA was again observed. This is indicative of nonequilibrium trapped voids being present in the as-molded samples. Field-emission scanning electron microscopy was used to show well-dispersed particles, and dynamic mechanical analysis was used to probe the mechanical properties (i.e., storage modulus) of the fully equilibrated composites. Even though no equilibrium Tg changes were observed, the addition of silica to the PMMA matrices was observed to improve the mechanical properties of the glassy polymer host. VC 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 2270–2276, 2007
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.physics.ncsu.edu/stxm/pubs/ade-2007-influence_of_sample_prep_and_proc.pdf
Language	English
Access Restriction	Open
Subject Keyword	Compression Diameter (qualifier value) Electron Microscopy John D. Wiley Ketones Methacrylates Methylmethacrylate Modulus robot Nanocomposite Nanocomposites Polymer Polymethyl Methacrylate Silicon Dioxide Simulated annealing methylethyl ketone monomer
Content Type	Text
Resource Type	Article

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