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Time resolved study of oriented crystallisation of poly(lactic acid) during rapid tensile deformation
Abstract Poly( l -lactic acid) with 4% d -lactic acid comonomer has been drawn in the amorphous state at 80, 90, 100, 110 and 120 °C at an extension rate of 4 s−1 while simultaneously recording WAXSExpand
X-ray microdiffraction study of chain orientation in poly(p-phenylene terephthalamide)
Single fibers of poly(p-phenylene terephthalamide) (PPTA; trade names: Kevlar 29 , Kevlar 49 , and Kevlar 149 ) have been scanned through a 3 μm diameter X-ray beam and the degree of orientation (f cExpand
Observation of a transient structure prior to strain-induced crystallization in poly(ethylene terephthalate)
Abstract Using time-resolved X-ray diffraction at the European Synchrotron Radiation Facility we have observed a highly oriented weak transient diffraction peak which persists for about 0.2 s priorExpand
Influence of temperature and chain orientation on the crystallization of poly(ethylene terephthalate) during fast drawing
Abstract Three regimes of poly(ethylene terephthalate) (PET) deformation are identified from a detailed analysis of time-resolved wide angle X-ray scattering (WAXS) data recorded during theExpand
Conformational transitions in the synthetic polynucleotide poly[d(G-C)] . poly[d(G-C)] double-helix.
The S form emerges as a particularly stable form of the poly[d(G-C)] . Expand
Investigation of the Multi-Step Dehydration Reaction of Theophylline Monohydrate Using 2-Dimensional Powder X-ray Diffractometry
Two dimensional powder X-ray diffractometry, using a high intensity source, is a powerful technique to study kinetics of rapid solid-state reactions, and the inhibitory effect of excipients can have profound effect on phases formed during pharmaceutical processing. Expand
Real time SAXS/stress–strain studies of thermoplastic polyurethanes at large strains
Abstract Simultaneous small angle X-ray scattering (SAXS) and force measurements have been recorded during tensile deformation of two contrasting polyurethane elastomers. The elastomers comprise theExpand
Effect of draw ratio and temperature on the strain-induced crystallization of poly (ethylene terephthalate) at fast draw rates
Abstract Wide angle X-ray scattering (WAXS) data recorded during the drawing of poly(ethylene terephthalate) (PET) under industrial processing conditions was analysed in terms of changes in theExpand
Ultrasonic measurements related to evolution of structure in curing epoxy resins
Abstract The tracking of the cure of epoxy adhesives and the assessment of the cure state of adhesive bondlines joining engineering components are important for quality assurance during manufactureExpand
Orientation and crystallisation mechanisms during fast drawing of poly(ethylene terephthalate)
SummarySynchrotron radiation has been used to record the diffraction patterns from Poly(ethylene terephthalate) for a range of draw rates (0.1 to 10sec−1) and temperatures (90 to 120°C). The patternsExpand