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Crystallization behavior in a number of blends and copolymers of nylons (polyamides) was investigated using time-resolved X-ray scattering data obtained simultaneously in the small- and wide-angle regimes. The following samples studied were: nylon 6 homopolymers (N6) of different molecular weights, copolymers of N6 and nylon 6,6 (N6/66), and blends of these with an amorphous nylon (N6I/T), which is...
Mesoscale (secondary) structure arising from association of layered silicates is quantified and its impact, along with constituent interactions, on elevated temperature crystallite morphology in nylon-6/montmorillonite nanocomposites is examined. Simultaneous small- and wide-angle X-ray scattering and diffraction methods are developed to provide detailed information on the secondary structure of the...
The early stages of isothermal melt crystallization in linear polyethylene (PE) were investigated via simultaneous synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. During these stages, noticeable short-range density fluctuations with periodic spacing from 40 to 80nm were detected (by SAXS) before the identification of three-dimensional crystal ordering...
For the purpose of resolving an uncertainty over the correct determination of the crystalline lamellar thickness in semicrystalline poly(ethylene terephthalate), PET, via small-angle X-ray scattering (SAXS) analysis, a gel-crystallization method from oligomeric poly- (ethylene glycol) solution was used to prepare samples with high crystallinity (57%). By using simultaneous synchrotron SAXS and wide-angle...
Morphological development of the homopolymer, poly(glycolide), PGA; its random copolymers, poly(glycolide-co-lactide), PGA-co-PLA (5:95 and 90:10) and segmented block copolymer, poly(glycolide-co-caprolactone), PGA-co-PCL (75:25) during isothermal crystallization was studied using simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques with synchrotron radiation...
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