Photograph 56. Quenched from

Photographs 42 and 43, Plate XII, show the development of the same structure after quenching from 990° and reannealing at 600°. 

Figure 20 Isothermal crystallization of about 40 ng iPP at 80 °C after quenching from the melt at lOOOKs". The inset shows the temperature profile, and the right photograph in the inset is the sample on the sensor. Reproduced with permission from Schick, C. Anal. Bioanal. Chem. 2009, 395,1589-1611. ...

Fig. 2.18 illustrates the nature of the intensity profiles in pure polyetheretherke-tone (PEEK) and carbon fiber reinforced PEEK composites in the transmission and reflection modes, respectively. The quenched amorphous and slowly cooled crystalline components from PEEK can be separated. The three prominent diffraction peaks from the crystalline components in Fig. 2.18(a) correspond to the three uniform rings which can be detected in X-ray photographs. In contrast, no clearly measurable signal is identified from the PEEK amorphous phase independent of the carbon fiber content. 

Fig. 7.29 Scanning electron microphotographs of quenched AP composite propellant burning surfaces without LiF (a) and with 0.5% LiF (b), obtained by a pressure decay from 2 MPa to 0.1 MPa the width of each photograph is 0.60 mm.

From a practical point of view the purpose of this study was to increase the crystallizability of the polycarbonate by incorporating in it well-defined amounts of plasticizer. With this modification, crystalline polycarbonate films could be made with a higher modulus of elasticity, and these would extend the usefulness of the polymers as photographic film bases. When this study was completed an article was published by Sears and Darby (16), who made an extensive study of the plasticization of polycarbonate using 50 plasticizers of widely differing types. The crystallization tendency in the presence of plasticizers was recognized by these authors as a problem and was circumvented by quench cooling. 

Figure 9-66. Quasicrystals (a) Flowerlike icosahedral quasicrystals in a quenched Al/Mn sample, from CsanSdy el al. [9-99] (b) pentagonal dodecahedron in quasicrystalline Al/Cu/Ru sample obtained by slow cooling from melt photograph courtesy of Professor H.-U. Nissen, Zurich (cf. Ref. ]9-100]). (Continued on next page)...

Fig. 11.21 PL (fluorescence) spectra (excitation light of A = 350 mn, 100 W) of Poly-9 a in chlcnoform solution (4.0 x 10 M) and b in cast film. Inset shows photographs of emitting and quenching between open form and PSS in solution (excitation light of A = 330— 390 nm, 16 W, handy lamp). Reversible changes of fluorescence intensities of Poly-9 at 575 nm c in cast films upon alternative irradiations of UV (blue area) and vis (yellow area) light. Reprinted with permission from [15]. Copyright 2008, American Chemical Society...

Fig. 11.23 a PL (fluorescence) spectra and b CPL (ot CPF, circularly polarized fluorescence) spectra of (/f)-Poly-10 cast films. The wavelength of excitation light for fluorescence was 380 nm. The inset shows photographs of the emitting film of the open form and the quenching film of the PSS of (7 )-Poly-10 (excitation wavelength A = 370 nm, 4 W, handheld lamp). Reprinted with permission from [20], Copyright 2010, Wiley... 

Fig. 6.1. FE-SEM photographs of cross sections of asymmetric 6FDA-BAAF membranes quenched in water at 30 °C and at 38 °C. Reprinted from [1 ]. Copyright 1999, with kind permission from the American Chemical Society...

Fig. 1 Photograph taken with a videodensitometer of a Whatman Multi-K SC5 plate showing the 2-D separation of a 16-component mixture of pesticides. The fluorescence-quenched zones are outlined for clarity. Direction 1 ethyl acetate-diisopropyl ether (2.5 97.5) mobile phase on the 20 cm x 3 cm K5F silica gel strip (normal phase TLC) direction 2 acetonitrile-water (85 15) on the adjacent 20 cm x 17 cm C-18F bonded silica gel layer (RPTLC). X Origin. Pesticides 1, propaquizafop 2, quizalofop-P 3, triadimefon 4, triadimenol 5, fenoxycarb 6, quinoxyfen 7, cyromazine 8, oxyfluorfen 9, fluoroglycofen 10, acetochlor 11, metazachlor 12, piperonyl butoxide 13, fur-alaxyl 14, pyriproxyfen 15, buprofezin 16, clofentezine. Source From Separation of a mixture of pesticides by 2D-TLC on two-adsorbentlayer Multi-K SC5 plate, in J. Liq. Chromatogr. Relat. Technol. with permission of Marcel Dekker, Inc.

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