Development of a transcrystalline phase in poly(propylene) at the PET interface

An isothermal crystallization behaviour is observed for poly(propylene) (PP ) on the surface of (ethylene terephthalate) (PET) fibers. The extensive nu cleation on the fiber surface is followed by the development of a transcrys talline phase, while normal PP spherulites appear much later than the trans crystalline phase in regions far from the interface. The crystallization is followed by spot-intensify measurements at selected the kinetics in the tr anscrystalline areas on the picture frame near fibers from that in the PP b ulk. Furthermore, a preferential orientation of the b-axis and/or bc-planes of PP crystallites the c-axis of PET fibers is found, suggesting that the crystal structure of the fiber material could also influence the developmen t of this phase.