Webpolymer chains are more or less regularly folded be-tween the upper and lower lamella surfaces with the chain stems between successive folds oriented preferen-tially normal … Weberal, polymers have been subject of intense research for a long time [1{5]. Generally speaking, the spatial confor-mation of the polymer chains de nes its properties, which in turn de nes its applications. On the other hand, the spatial conformation is de ned by temperature and by the solvent. So it is important to understand how these external ...

Polymer Features in Crystallization SpringerLink

WebGeneral chain-folding behavior, J. Polymer Sci. A-2 10, 221–238 (1972). CAS Google Scholar L. D’Ilario, A. Keller, and E. Martuscelli, Crystallization of short aliphatic chains. II. Example of even fold surface with adjacent … WebFeb 8, 2024 · As results, it is found that glassy chains adopt the same adjacent re-entry structure (adjacent re-entry number, n = 1) with the melt- and cold-grown crystals. From these results, it is concluded that (i) folding occurs prior to crystallization and (ii) melt and cold crystallization do not induce additional folding but proceed with ... long meadow veterinary clinic tx

Foldamer hypothesis for the growth and sequence differentiation …

WebMar 10, 2014 · The folded-chain lamellar crystals grown from the extended-chain precursor have been proposed by Keller and Machin [27], and such different trends of chain-folding result in a shish-kebab structure of crystallites, as observed even by means of atomic force microscopy in the crystallization process of sheared bulk polymers [50]. Since our ... WebThe study of the formation of lamellar polymer crystals through chain folding has received a new impetus as a result of the recent synthesis of normal alkanes of strictly uniform chain lengths up to C 390 H 782. Chain folding is found in all such paraffins starting with C 150 H 302. As with polyethylenes obtained by conventional polymerization ... WebSep 16, 2016 · Previous work from Barnes and coworkers also report a similar species when MEH-PPV molecules are cast directly on glass suggesting a surface-induced folding of the polymer chain [31,32]. The similarity of this emitter with bulk films may further indicate these species are aggregates although average intensities were not significantly brighter. hope chest bolivia nc