3 PolymerMorphology

3 PolymerMorphology - Crystalline Morphology of Polymers Polymers are always semi-crystalline In polymers the process of crystallization is never

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Crystalline Morphology of Polymers • Polymers are always semi-crystalline • In polymers, the process of crystallization is never complete. • Polymers always contain some amorphous regions and are always semi- crystalline.
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Single Crystals of Polyethylene Formed From Dilute Solution
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X-ray diffraction indicates the polymer chains are aligned perpendicular to the broad faces of the pyramids. The thickness is much less than the extended chain length so the polymer chains must be folded.
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The Unit Cell of Polyethylene is Orthorhombic .
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In the orthorhombic unit cell, the conformation of the polyethylene chain is a planar zigzag.
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If the large substituted atoms of a vinyl polymer, when laid out in a planar zigzag, exceed 254 pm, this structure cannot occur since the substituted atoms would be too big and touch. In real vinyl polymers, the substituted atoms or groups of atoms always
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This note was uploaded on 11/10/2010 for the course EGR 201 taught by Professor Cerry during the Spring '10 term at Virginia College.

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3 PolymerMorphology - Crystalline Morphology of Polymers Polymers are always semi-crystalline In polymers the process of crystallization is never

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