The Poly(vinylidene) fluoride (PVDF) thin films with a high content of β-phase were prepared by controlling heat-treatment temperature using casting from the poled solvents. The crystallite microstructure of thin films was depicted by the techniques of X-ray diffraction and FTIR. The results...

We study the evolution of thermal degradation of samples of polypropylene (PP), during their aging for two periods of 60 and 80 days. The study, using thermogravimetric analysis (TG) and differential scanning calorimetric (DSC) analyses, focused on two types of aging: the natural one under the...

A semiquantitative theoretical discussion is given of a DNA nucleoid escaping from a bacterial cell after lysis. There is a strong excluded-volume effect causing the nucleoid to expand, though it may be held together globally by various constraints. It is argued that the friction is dominated by...