Synthesis, characterization, and glass transition temperature of poly(styrene-b-butyl methacrylate) block copolymers by stable free radical polymerization

2001 ◽  
Vol 82 (1) ◽  
pp. 14-21 ◽  
Author(s):  
M. Fernández-García ◽  
R. Cuervo-Rodríguez ◽  
E. L. Madruga
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Free Radical ◽  
Glass Transition Temperature ◽  
Block Copolymers ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Butyl Methacrylate ◽  
Stable Free Radical ◽  
Stable Free Radical Polymerization

Investigation into the Thermal and Mechanical Behavior of PMMA/Alumina Nanocomposites

2000 ◽  
Vol 661 ◽  
Author(s):  
Benjamin J. Ash ◽  
Jason Stone ◽  
Diana F. Rogers ◽  
Linda S. Schadler ◽  
Richard W. Siegel ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Free Radical ◽  
Glass Transition Temperature ◽  
Mechanical Behavior ◽  
Radical Polymerization ◽  
Ultimate Strength ◽  
Yield Point ◽  
Free Radical Polymerization ◽  
Average Increase

ABSTRACTPolymethylmethacrylate (PMMA) nanocomposites were synthesized by free radical polymerization in the presence of various weight percentages of alumina (Al2O3) nanoparticles. The resulting nanocomposites show an average increase of 600% in strain-to-failure and the appearance of a well-defined yield point. Concurrently, the glass transition temperature (Tg) of the composites decreased 20°C, while the ultimate strength and the Young's modulus decreased by 20% and 15%, respectively.

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