We observed that diffusion of the monomer, stability of the initiator attachment to the surface, and aggregation of the particles controls the properties of the grafted polymers on particle surfaces. Polymers grafted from nanoparticle surfaces show higher polydispersity and lower molecular weight than those formed in solution. For the nanoparticles, the grafted polymers were cleaved and characterized by FTIR, NMR, AFM, TGA and SEC. Model studies were initially done on flat Si-wafer surface and recently with Au surfaces.
SIP of polystyrene from Silicate and clay nanoparticles surfaces have been made by the living anionic polymerization method with 1, 1-diphenylethylene (DPE) initiation sites attached to nanoparticle surfaces using chlorosilane and amino functional groups. Understanding the surface chemistry issues involved is critical for future applications and protocols. On the other hand, the use of the anionic polymerization method on surfaces allows the possibility of combining a variety of polymers (organic) with various nanoparticle and surfaces (inorganic) for the preparation of hybrid nanocomposite materials.Ībstract = "To investigate the grafting of polymer chains onto nanoparticles (metal, semi-conductor, inorganic, etc) and nanostructured (patterned) surfaces, we have investigated anionic surface initiated polymerization (SIP) on a variety of surfaces.
Ahhhhhh FIRST SIP has managed to get into the driver's seat of this new blog posting with expectations of another event to report as I climb out of this same seat at the end of the day.To investigate the grafting of polymer chains onto nanoparticles (metal, semi-conductor, inorganic, etc) and nanostructured (patterned) surfaces, we have investigated anionic surface initiated polymerization (SIP) on a variety of surfaces. Juggling my precious cup of coffee, keys and thermos of even more precious brew, I unlock the van door ever careful of retaining the balance needed to keep that cup level. A FINAL SIP before leaving the house and dashing to my van. My keys already dangling from my belt as I fill the cup once again to go. ANOTHER SIP as I repeatedly tie my shoes with those freakin extra long laces fumbling between my fingers. That FIRST SIP as reality nudges me of the time ticking away as I splash cold water on my face. Ahhhhhhh the aroma and bitterness of mountain grown Columbian coffee filling my senses as I focus on the tasks at hand. Indeed an all encompassing event as I pour the precious steaming liquid, raise the cup to my quivering lips and savor that FIRST SIP OF THE DAY. Dashing and dangling as I grope about in the morning preparing for that first moment.
0 kommentar(er)
