2007 Volume 64 Issue 8 Pages 525-538
Polymeric materials give different morphologies, depending on the processing conditions, even with the same molecular architectures. If such morphological formation becomes fully controllable, the ultimate properties of molecular chains can be achieved in the bulk state. Therefore, the varieties in structure and properties are expectable even for conventional polymers having the simple chemical structure. Molecular anisotropy and entanglement, which a priori originate from their chain architectures, are key factors for structural and property development mechanisms on processing. Recent methodological improvement reveals the changes in such molecular characteristics during processing. In this research, the melt-drawing technique is applied to induce the molecular anisotropy by disentanglement formation. Also, in-situ structural analyses during such melt-drawing processes and their industrial applications are discussed.