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Elongation induced phase separation

Chen Qun, Kurosu Hiromichi, Ma Lin, and Matsuo Masaru. Elongation-induced phase separation of poly(vinyl alcohol)/poly(acrylic-acid) blends as studied by C CP/MAS NMR and wide-angle X-ray diffraction. Polymer. 43 no. 4 (2002) 1203-1206. [Pg.73]

The predominant conformation of the mother compound bicyclo[3.3.1]nonane in the gas phase is the double chair (cc), as detected by electron diffraction studies (120-123). The most important destabilization in the cc conformer of this structure is van der Waals repulsion of the endo-3- and endo-7- hydrogen atoms. In the twin-chair conformation with ideal tetrahedral angles, the C3-C7 separation would be 2.5 A and the separation of the corresponding endo-hydrogen atoms would have the physically impossible value of 0.75 A (124). Repulsion induces an elongation of the C3- - C7 distance to 3.1 A, which translates to an endo-hydrogen distance of 2.2 A,... [Pg.627]

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Elongation induced phase separation polymer blends

Elongation phase

INDUCED PHASE SEPARATION

Phase induced

Phase inducer

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