Die sintese van terpenoiede vanaf prenaal

Proefskrif (M. Sc.) -- Universiteit van Stellenbosch, 1980.Full text to be digitised and attached to bibliographic record

Die sintese van terpenoiede en poliene vanaf prenaal en verwante karbonielverbindings

Proefskrif (Ph. D.) -- Universiteit van Stellenbosch, 1986.Full text to be digitised and attached to bibliographic record

Die sintese van terpenoiede en poliene vanaf prenaal en verwante karbonielverbindings

Proefskrif (Ph. D.) -- Universiteit van Stellenbosch, 1986.Full text to be digitised and attached to bibliographic record

Photopolymerization kinetics and dynamic mechanical properties of silane hydrolysed without evolution of byproducts. I. Tetrakis(methacryloyloxyethoxy)silane-diethylene glycol dimethacrylate

The temperature dependence of photopolymerization kinetics of tetrakis[(methacryloyloxy)ethoxy]silane (TetMESi) was compared with an analogue, diethylene glycol dimethacrylate and their copolymers. In all cases, the kinetics are controlled by the temperature dependence of the propagation step, the effect of diffusion on radical termination, the effect of rising glass transition during cure, and topological restraint on complete conversion. The glass transition regions of these polymers were very broad, suggesting their use in high temperature applications. NMR of the TetMESi monomer, and FTIR and water sorption measurements during exposure to water of the TetMESi-based polymers showed that the Si−O−C bond was slowly hydrolyzed, resulting in water-swollen polymers containing poly(hydroxyethyl methacrylate) which reduced the glass transition temperature and narrowed the glass transition region. UV−vis spectroscopic studies showed that during exposure to water, SiO2 nanoparticles or nanostructures were formed from the condensation of the silanol groups formed during the hydrolysis of TetMESi.Fil: Uygun, Mustafa. Monash University; AustraliaFil: Cook, Wayne D.. Monash University; AustraliaFil: Moorhof, Cornelis. Monash University; AustraliaFil: Chen, Fei. Monash University; AustraliaFil: Vallo, Claudia Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería; ArgentinaFil: Yagci, Yusuf. Istanbul Technical University; TurquíaFil: Sangermano, Marco. Politecnico Di Torino; Itali