The effect of morphology on thermal stability of isotactic polypropylene in air

Miscibility of isotactic polypropylene with atactic polystyrene

“…A similar value of degree of crystallinity is expected for iPP in the blends with aPS. The pure iPP sample prepared in the same way [17] has a degree of crystallinity of about 40 %. Thus the crystalline phase of iPP in the blends with aPS has the effect on the amorphous phase of aPS similar to its own crystals being in iPS.…”

“…Two hours' crystallization at 130 ~ (above the Tg of polystyrene) allows the macromolecules of iPP to separate and crystallize in the form of spherulites. However, the spherulite size ofiPP in the blend is much smaller than that obtained when pure iPP was crystallized at the same temperatures [17]. Only samples quenched at 0 ~ seem to be interesting from the point of view of the miscibility of their components.…”

Thermooxidation rate of diacetate terminated polyoxymethylene with various morphological structures

“…The studies reported here are a continuation of our previous investigations on the thermooxidation of isotactic polypropylene with various morphological structures [10][11][12][13], where it was found that the morphological structure of isotactic polypropylene affects the rate of polymer oxidation.…”

Oxygen uptake by isotactic polypropylene of different morphological structure

“…Thermooxidation studies of isotactic polypropylene at temperatures below the melting point of the polymer have been discussed in previous publications [1][2][3][4] in terms of the effect of different morphological structure of samples on the process. It was shown that the number of molecular chain scissions in the thermooxidative process depends both on the degree of crystallinity and on the size of spherulites in the polymeric sample.…”