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Original title in Czech: Makromolekulární chemieFCHAbbreviation: DKCO_MCHAcad. year: 2009/2010
Programme: Macromolecular Chemistry
Length of Study:
Accredited from: 27.2.1995Accredited until: 31.5.2013
Guarantor
prof. RNDr. Josef Jančář, CSc.
Issued topics of Doctoral Study Program
Tutor: Vojtová Lucy, doc. Ing., Ph.D.
Majority of research efforts in the field of polymers filled with individual nanoparticles is concentrated to the viscoelastic behavior, flammability and other physico-chemical properties. Fracture characteristics of this kind of polymer materials stay unrevealed. Hence, this work should represent a comprehensive investigation in the field of fracture behavior of polymer nanocomposites. The accent will be put on the investigation of the effect of surface treatment of nanoparticles as well as molecular parameters of polymer matrix. Student will go through laboratory preparation and processing procedures, machining of specimens and impact testing methods. The testing methods will involve use of instrumented impact pendulum equipped with high-speed camera. In addition, tensile testing and various imaging methods will be employed. In spite of the extensive experimental program, effort in the field of theoretical treatment will be accented.
Tutor: Jančář Josef, prof. RNDr., CSc.
Crosslinking mechanism and kinetics study of different PE grades by the aid of peroxide radical initiation in heterogeneous medium (solid states polymer particles). It includes literature survey, choice of polymers, initiators and other additives, providing planned experiments and evaluation of results attained. Evaluation is to be oriented mainly towards influencing structure, molecular weights distribution and rheological properties
Tutor: Petrůj Jaroslav, doc. RNDr., CSc.
Crosslinking mechanism and kinetics study of different PE grades by the aid of peroxide radical initiation in homogeneous medium (in the melt). It includes literature survey, choice of polymers, initiators and other additives, providing planned experiments and evaluation of results attained. Evaluation is to be oriented mainly towards influencing structure, molecular weights distribution and rheological properties.
Thermooxidation mechanism and kinetics study of different PE grades. It includes literature survey, choice of polymers, initiators and other additives, providing planned experiments and evaluation of results attained. Oxidation is to be carry out in oven on polymer films to a low conversion only. Evaluation is to be oriented mainly towards determination of primary oxidation products (hydroperoxides, peracids, ketones etc.). Evaluate results kinetically and compare thermooxidation course in dependence of polymer structure.
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Tutor: Nezbedová Eva, doc. Ing., CSc.
Adding of inorganic particles with size in the range of diameter from 5 to 30 nm into an amorphous polymer matrix causes considerable modification of the viscoelastic manifestations of a polymer. Above the glass transition temperature of matrix, polymer nanocomposite exhibits elastic modulus much higher than can be explained on the basis of simple micromechanical models. This effect occurs due to the interaction of polymer chains with extensive nano-filler surface. The interaction leads to significant change of segmental dynamics of polymer chains as well as statistical segmentation of polymer chains. Consequently, the addition of nanoparticles completely change relaxation spectrum of a polymer. The work will be focused on understanding fundamental molecular mechanisms responsible for the observed viscoelastic behavior. Student will break into the preparation and processing procedures of nanocomposite samples, various physical characterization methods, as well as fundamental concepts of polymer physics and basics of computer simulation methods.