Polymerization of Vinylidene Fluoride in Supercritical Carbon Dioxide:  Effects of Poly(dimethylsiloxane) Macromonomer on Molecular Weight and Morphology of Poly(vinylidene fluoride)

2005 ◽  
Vol 38 (2) ◽  
pp. 355-363 ◽  
Author(s):  
Hongyun Tai ◽  
Wenxin Wang ◽  
Roland Martin ◽  
Jun Liu ◽  
Edward Lester ◽  
...  
2000 ◽  
Vol 629 ◽  
Author(s):  
Srinivas Siripurapu ◽  
Yvon J. Gay ◽  
Joseph R. Royer ◽  
Joseph M. DeSimone ◽  
Saad A. Khan ◽  
...  

ABSTRACTMicrocellular polymeric foams (MPFs) hold tremendous promise for engineering applications as substitutes to their solid analogs in light of reduced manufacturing/materials costs and improved properties. We present a two-part study addressing the generation of such materials in the presence of supercritical carbon dioxide (scCO2). The first part describes the production of polystyrene MPFs in a continuous extrusion process, as well as the effect of operating conditions such as temperature and CO2 concentration on foam morphology. The second part discusses microcellular foaming of poly (vinylidene fluoride) (PVDF), a semicrystalline polymer, via blending with the amorphous polymer poly (methyl methacrylate) PMMA. Foams of pure PVDF possess ill-defined morphologies, whereas those of PVDF-PMMA blends show an improvement with cell sizes on the order of 10 mm or less and cell densities in excess of 109 cells/cm3.


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