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J.YangandP.H.Geil T.C.LongandP.Xu 《高分子科学》2005,(2):137-145
The effect of sintering dispersed and bulk, low molecular weight (Mn = 50,000 Da), nano-emulsion polytetrafluoroethylene (PTFE) particles near their melting point is described. With the nascent particles consisting of ca.75 nm diameter, hexagonal, single crystals, sintering at, e.g., 350℃, results, initially, in merger of neighboring particles,followed by individual molecular motion on the substrate and the formation of folded chain, lamellar single crystals and spherulites, and on-edge ribbons. It is suggested these structures develop, with time, in the mesomorphic “melt”. Sintering of the bulk resin yields extended chain, band structures, as well as folded chain lamellae; end-surface to end-surface merger,possibly by end-to-end polymerization, occurs with increasing time. 相似文献
104.
Consider a finite dimensional vector space over a field of prime characteristic. We show that two differently constructed
filtrations of the symmetric powers of this space coincide. One of them arises from the representation theory of the general
linear group. In order to get the other one we interpret the symmetric powers as crystalline cohomology groups and use the
action of the Frobenius endomorphism on this cohomology.
Dedicated to Jacques Tits on his sixtieth birthday
Supported in part by the NSF. 相似文献
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Hexa‐ and nonanuclear titanium complexes were obtained by self‐assembly of titanium(IV)‐tert‐butoxide and D ‐mandelic acid. Suitable single crystals of these complexes were characterized by X‐ray structure analysis. When used with these complexes, aldol adducts were isolated with a high degree of regioselectivity in direct aldol additions of aromatic and aliphatic aldehydes to functionalized unsymmetrical ketones. High syn‐diastereoselectivities were obtained in aldol additions of enolizable aldehydes with hydroxyacetone and methoxyacetone. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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John N. Helbert Edward H. Poindexter Burkhard E. Wagner 《Chemical physics letters》1977,52(3):546-548
Strongly scalar 1H intermolecular dynamic nuclear polarization (DNP) of solvent 1H nuclei in solutions of organic free radicals has now been observed at room temperature. Transient protonation of the CF3COOH/pyridyl imidazoline-1-oxyl radical system accounts for the observed effects. 相似文献