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Crystal structures, polymers space group

From a nanoscale point of view, /3-PP crystallizes in a hexagonal form with a = b = 11.01 A and c = 6.49 A (the space group is probably P3i) [86,96-98]. It belongs to a class of polymers which displays a frustrated structure, referring to the fact that the helices in the unit cells have different azimuthal settings [37,99-101]. The relative amounts of a- and /3-forms in a sample are controlled by intrinsic molecular parameters and extrinsic factors. They will be discussed in detail in Sect. 3.2. [Pg.48]

The crystal structure (space group I4icd) consists of a helical polymer of BH4Be and BH4 units with two hydrogen bridges between B and Be [29[. So far, experimental data are not available but first principle calculations suggest a decomposition temperature of —111 °C at 0.1 MPa [30]. [Pg.123]

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See also in sourсe #XX -- [ Pg.519 , Pg.545 ]



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Crystal spacing

Crystal structure Group

Crystals space groups

Group 230 space groups

Group structure

Polymer group

Space group

Structure space groups

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