Wide-angle X-ray pattern

Isotropic solutions (12-15% by weight) of XVI in m-cresol were dry-jet wet spun into a coagulation bath of water/methanol. The as-spun fibers were drawn at temperatures above 380 °C to give fibers having a tensile strength of about 3.2 GPa and a modulus of 130 GPa. The annealed fibers displayed distinct wide-angle X-ray patterns from which a monoclinic unit cell was determined. 

X-Ray Analysis. Wide angle x-ray patterns were photographically recorded with 30-minute exposures from selected areas of the injection-molded samples. 

Early attempts to devise chain configurations consistent with the wide-angle X-ray pattern have been summarized by Kendrew (1954), and the present account deals only with structures based on the a-helix. 

Figure 7. Sketch of wide-angle X-ray pattern for polymer I.

Materials which exhibit a preferred orientation in either the amorphous or crystalline phases reflect this in the wide-angle X-ray pattern. Figure 1.13 shows the wide-angle X-ray pattern for a melt spun monofilament fibre of poly -capralactone obtained using a transnfission system equipped with an... 

Fig. 1.13 Wide-angle X-ray pattern of a melt spun fibre of poly e-caprolactone. The fibre axis is vertical. The intense spots on the equator correspond to Q 1.5 A f...

Wide angle X-ray patterns of the aged and unaged polyester are in Figure 3. Sharp lines, indicative of crystallinity, occur in the pattern from the former polymer these are absent from the pattern from the unaged polymer. 

Fig. 12. Wide angle X-ray patterns of (a) imdeformed high density polyethylene, (h) cold rolled high density polyethylene (k 5)—beam directed along the X-axis...

Fig, 1,5 Wide-angle x-ray pattern of noncrystalUne natural rubber, (Courtesy of A, F. 

Figure 5. Wide-angle X-ray pattern of PPTA fiber spun from the optically anisotropic, liquid-crystalline phase. Fiber axis is vertical.

The structure of thermo-reversible gels of high molecular weight polyethylene, discussed in the following sections, is revealed by the self-explanatory wide-angle X-ray pattern and micrographs in Figures 13 and 14. 

Wide angle X-ray patterns of the composite fibers consisted of superimposed reflections from the two components, indicating that PANI and PPTA segregated during the coagulation.[13] In Figure 2 (inset), the conductivity vs volume fraction of PANI Is shown on a log-log plot the results indicate that over a relatively wide range of concentrations, the conductivity follows a simple power law,... 

Wide-angle X-ray patterns of nanocomposites in feedstock compound form. 

Figure III.1 Wide angle X-ray pattern of drawn P30T fibers.

Hachiboshi et al were able to crystallize random copolymers of ethylene terephthalate/ ethylene isophthalate over the complete composition range. The wide-angle X-ray patterns of these copolymers change systematically with co-unit content and it is concluded that the two units can cocrystallize and can form a new unit cell. A complete phase diagram, involving both the solidus and liquidus composition, was determined and is illustrated in Figure 23. The solidus was determined by... 

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