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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Polymer Physics I
CPP 2.3: Vortrag
Montag, 26. März 2007, 10:30–10:45, H40
Core-shell filler in a block copolymer matrix: morphology and properties — •Leszek Jakuczek1,2, Jochen Gutmann2,3, and Danuta Zuchowska1 — 1Wroclaw University of Technology,Wroclaw,Poland — 2Max Planck Institute for Polymer Research,Mainz,Germany — 3J.Gutenberg University,Mainz,Germany
Physical modification of block copolymer matrices has drawn much attention due to the remarkable possibility of property tailoring. Numerous structures can be prepared by changing the properties of the matrix (e.g. block length) or those of the nanofiller (dimensions, type of modification). Simultaneously interesting research problems- e.g. possible spatial arrangements of constitutive elements- can be addressed.
PS-grafted nanoparticles (polysiloxane microgel) were used as the filler. The inorganic cores were synthesized in a sol-gel process and surface modified with ATRP initiator. Controlled polymerization allowed to obtain well-defined polymer shells (Mw- up to 30 kg/mol; Mw/Mn about 1,10).
PS-grafted nanoparticles were used to modify the PS-PI diblock and PS-PI-PS triblock copolymers. All samples were prepared via solution casting. Upon changing the filler type and loading, the influence of such parameters as Mw of grafted chains, grafting density and particle dimensions on the properties of host matrix could be extensively evaluated. Nanocomposites were thoroughly characterized- morphology changes were identified and visualized using SAXS and TEM. Additional information was obtained from rheological and thermal analyses (by the DSC).