Download PDF by Giuseppe Allegra (Editor): Interphases and mesophases in polymer crystallization

By Giuseppe Allegra (Editor)

ISBN-10: 3540253459

ISBN-13: 9783540253457

ISBN-10: 3540282807

ISBN-13: 9783540282808

This sequence offers severe reports of the current and destiny traits in polymer and biopolymer technological know-how together with chemistry, actual chemistry, physics and fabrics technology. it really is addressed to all scientists at universities and in who desire to retain abreast of advances within the subject matters lined.

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Extra info for Interphases and mesophases in polymer crystallization

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Abstract Recent extensive experimental work and the limited theoretical studies of the phenomenon of self-poisoning of the crystal growth face are reviewed. The effect arises from incorrect but nearly stable stem attachments which obstruct productive growth. Experimental data on the temperature and concentration dependence of growth rates and 46 G. Ungar et al. the morphology of long-chain monodisperse n-alkanes from C162 H326 to C390 H782 are surveyed and compared to some previously established data on poly(ethylene oxide) fractions, as well as on polyethylene.

Right-handed and left-handed helices are associated in bilayers parallel to the (110) plane of the unit cell (Fig. 3a) [25]. Furthermore, the right-handed and left-handed helices are oriented in opposite azimuthal directions (in Fig. 3a, one of their sidechains is oriented either towards the top or towards the bottom of the page). Due to this arrangement, all flat faces of the three-fold helices (seen in chain axis projection) are located in the same plane, (110). Furthermore, the flat faces that are in contact in the (110) plane are different: one exposes only right-handed helices, and the other exposes only left-handed helices.

It does indeed indicate that the thin film as a whole has a single crystal texture: the diffraction pattern is not symmetrical, as would be expected for a fiber or even a uniplanar orientation. In particular, the strong diffraction spot on the second layer line indicates the tilt of crystallographic planes containing the side-chains illustrated in Fig. 3b. This tilt is the same for the right and left-handed helices in this layer (helices are related by a glide plane parallel to the layer), again in agreement with the crystal structure of iPBu-1.

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Interphases and mesophases in polymer crystallization by Giuseppe Allegra (Editor)


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