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An experimental study of the glass transition induced by solvent desorption has been performed for a series of Methyl methacrylate (MMA)/n-butyl methacrylate (nBMA) statistical copolymer films. The glass transition temperature of the dry homopolymers, PMMA and PnBMA, are, respectively, about 105 and 7°C above the temperature of the experiment, so that the glass transition domain can be analyzed in...
The imidization and cure reactions of a thin film of phenylethynyl imide oligomer (LaRC PETI-5, M n =2500g/mol) applied to a glass fabric and processed under cumulative and isothermal heat-treatment conditions have been measured. Three distinguishable peaks were detected in the tanδ curves, which give useful information on the glass transition temperature, imidization temperature, and cure...
Ultra-thin layers (h=50–150nm) of PVC, functionalised in solution by thiophenol (t-PVC) and 4-aminothiophenol (am-PVC), were prepared by spin-coating on silicon wafers. The glass transition temperature of these thin films was investigated by kinetic scan ellipsometry. The Tg of the am-PVC and t-PVC modified PVC is found to increase more strongly with the degree of modification in thin layer geometry...
Experimental evidence is reached by differential scanning calorimetry (DSC), and modulated differential scanning calorimetry (MDSC), about the existence of a glass transition in a commercial ethylene-1-octene copolymer synthesized with a metallocene catalyst and in its corresponding composites with glass fibre at different content of reinforcement. The glass transition is found in the region from...
Literature data on the viscosity of solutions of poly(butyl methacrylate) (PBMA) and poly(methyl methacrylate) (PMMA) in diethyl phthalate (DEP) for different temperatures, including the range around and below T g , the glass transition temperatures of the pure polymers, were evaluated by means of an approach that uses surface fractions as composition variables. The discussion of these results...
The influence of electron irradiation on the glass transition temperature, T g , of poly(ether ether ketone) (PEEK) has been investigated by differential scanning calorimetry, up to a dose of 100MGy. For amorphous PEEK, the observed T g increases linearly with absorbed dose at a rate of 0.18°CMGy −1 . This indicates the formation of crosslinks, as deduced elsewhere. Above ∼50MGy,...
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