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Staggered-gauche

The difference between the energy minima in the trans and gauche staggered conformations is labeled Ae in Fig. 4-2. When this energy is less than the thermal energy RT jL provided by collisions of segments, none of the three possible staggered forms will be preferred. If this occurs, the overall conformation of an isolated macromolecule will be a random coil. When Ac > RT/L, there will be a preference for the trans state. We have seen that this is the only form in the polyethylene crystallite. [Pg.134]

The trans staggered conformation is a lower energy form than either of the gauche staggered forms of polyethylene. The difference is much less for polyisobutene, however, as illustrated in Fig. 4-3. Here the chain substituent on the rear carbon shown is either between a methyl and polymer chain or between two methyl groups on the other chain carbon atom. Since no conformation is favored, this polymer tends to assume a random coil conformation. The polymer is elastomeric and can be caused to crystallize only by stretching. However, rotations between... [Pg.134]

Ae difference between energy minima in trans and gauche staggered conformations (Fig. 4-2)... [Pg.494]

Square planar cis-[Rh(dppf-P, P)(nbd)l[C10J chelate gauche (staggered) ... [Pg.20]

Iegged piano-stool Rh (tj -C6H5)B(C6H5)3 (dppf-F,F) chelate gauche (staggered) 32.2(8)"... [Pg.24]

Ru(tj=-C5H5)H(dppf-F,F) Molecule I chelate gauche (staggered) 37c-... [Pg.24]

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See also in sourсe #XX -- [ Pg.97 ]



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Gauche

Staggered

Staggerer

Staggering

Staggers

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