|
|
Use of starch and glycerin in polymer films with controlled life span
Almásyová, Zuzana ; Pospíšil, Ladislav (referee) ; Jančář, Josef (advisor)
This diploma thesis deals with preparation and testing of biodegradable materials for use in the packaging indrustry. The task of this work is to prepare set of laboratory made films based on wheat starch, glycerol, polyvinyl alcohol with the addition of a suitable additive, which has been selected as citric acid. A suitable composition meeting the requirements of the packaging foils has been found. Quaternary blends from all components achieve the best results. It has been found that citric acid can influence the chemical structure and thus affect the mechanical and thermal properities and also the degree of solubility. The films were characterized in terms of mechanical properities by tensile testing and thermal stability by means of thermogravimetric analysis with respect to the phase structure. The structure was characterized by Fourier transform infrared spectroscopy and confocal laser scanning microscopy. The biodegradability of the film was tested by its solubility in aqueous medium.
|
|
|
Hybrid composite based on dental matrix
Almásyová, Zuzana ; Bystřický, Zdeněk (referee) ; Přikryl, Radek (advisor)
This bachelor´s thesis deals with the study of the effect of alumina fillers addition on mechanical properities of experimental composite based dimethacrylate matrix. Important properities and aspects of particle composite, composite mechanics and surface treatments methods were described in the theoretical section of this work. As a studied system was dimethacrylate matrix with micro-filler in form of barium glass and nano-filler in form of alumina. The filler was modified by two silanization methods. Surface treatment of the filler was studied by termogravimetry and infrared spectroscopy. Morphology of fracture areas was examined using scanning electron microscopy with the aim to characterize dispersion of particles in the matrix. Mechanical properties of prepared composite materials were established by the testing of the flexural properties. The best silanization method of particular filler was determined. The addition of alumina had a negative effect on the resulting mechanical properties of prepared composite.
|
|
|
Use of starch and glycerin in polymer films with controlled life span
Almásyová, Zuzana ; Pospíšil, Ladislav (referee) ; Jančář, Josef (advisor)
This diploma thesis deals with preparation and testing of biodegradable materials for use in the packaging indrustry. The task of this work is to prepare set of laboratory made films based on wheat starch, glycerol, polyvinyl alcohol with the addition of a suitable additive, which has been selected as citric acid. A suitable composition meeting the requirements of the packaging foils has been found. Quaternary blends from all components achieve the best results. It has been found that citric acid can influence the chemical structure and thus affect the mechanical and thermal properities and also the degree of solubility. The films were characterized in terms of mechanical properities by tensile testing and thermal stability by means of thermogravimetric analysis with respect to the phase structure. The structure was characterized by Fourier transform infrared spectroscopy and confocal laser scanning microscopy. The biodegradability of the film was tested by its solubility in aqueous medium.
|
|
|
Hybrid composite based on dental matrix
Almásyová, Zuzana ; Bystřický, Zdeněk (referee) ; Přikryl, Radek (advisor)
This bachelor´s thesis deals with the study of the effect of alumina fillers addition on mechanical properities of experimental composite based dimethacrylate matrix. Important properities and aspects of particle composite, composite mechanics and surface treatments methods were described in the theoretical section of this work. As a studied system was dimethacrylate matrix with micro-filler in form of barium glass and nano-filler in form of alumina. The filler was modified by two silanization methods. Surface treatment of the filler was studied by termogravimetry and infrared spectroscopy. Morphology of fracture areas was examined using scanning electron microscopy with the aim to characterize dispersion of particles in the matrix. Mechanical properties of prepared composite materials were established by the testing of the flexural properties. The best silanization method of particular filler was determined. The addition of alumina had a negative effect on the resulting mechanical properties of prepared composite.
|
guest ::
