TY - JOUR
T1 - Effect of interfacial area on heterogeneous free radical grafting of vinyl monomers in supercritical carbon dioxide: Grafting of acrylic acid on poly(vinylidenefluoride) nanoparticles
AU - Lanzalaco, Sonia
AU - Scialdone, Onofrio
AU - Galia, Alessandro
PY - 2015
Y1 - 2015
N2 - The role of the polymer interfacial area on free radical grafting of acrylic acid (AA) onto poly(vinylidenefluoride) (PVDF) was studied at 65°C using supercritical carbon dioxide (scCO2) as a solvent and swelling agent, benzoylperoxide (BPO) as chemical initiator and PVDF nanoparticles as polymer matrix. Under adopted conditions PVDF particles do not melt neither dissolve in the reaction medium and FTIR analyses performed on carefully washed nanoparticles confirmed the achievement of high grafting levels. The mass fraction of grafted AA increased with the grafting time and the BPO concentration while it decreased when the density of the fluid phase was enhanced. Collected results suggest that the grafting level obtained by free radical grafting of vinyl monomers onto solid polymer in scCO2 can be significantly enhanced by increasing the interfacial area of the matrix.
AB - The role of the polymer interfacial area on free radical grafting of acrylic acid (AA) onto poly(vinylidenefluoride) (PVDF) was studied at 65°C using supercritical carbon dioxide (scCO2) as a solvent and swelling agent, benzoylperoxide (BPO) as chemical initiator and PVDF nanoparticles as polymer matrix. Under adopted conditions PVDF particles do not melt neither dissolve in the reaction medium and FTIR analyses performed on carefully washed nanoparticles confirmed the achievement of high grafting levels. The mass fraction of grafted AA increased with the grafting time and the BPO concentration while it decreased when the density of the fluid phase was enhanced. Collected results suggest that the grafting level obtained by free radical grafting of vinyl monomers onto solid polymer in scCO2 can be significantly enhanced by increasing the interfacial area of the matrix.
KW - Coatings and Films; Chemistry (all)
KW - biomedical applications; functionalization of polymers; grafting; radical polymerization; synthesis and processing; Materials Chemistry2506 Metals and Alloys; Polymers and Plastics; Surfaces
KW - Coatings and Films; Chemistry (all)
KW - biomedical applications; functionalization of polymers; grafting; radical polymerization; synthesis and processing; Materials Chemistry2506 Metals and Alloys; Polymers and Plastics; Surfaces
UR - http://hdl.handle.net/10447/231952
UR - http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4628
M3 - Article
VL - 132
SP - n/a-n/a
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
SN - 0021-8995
ER -