Entanglement braids

It is apparent that the solubilization of amphiphilic molecules with chiral head groups produces aggregates such as braided fibers, helices, ribbons, rods, or tubules. When these organizations are sufficiently extended, they start to get entangled and develop the ability to entrap solvent molecules in the resulting reticulum. Many such instances eventually lead to the formation of gels. This phe-... 

Therefore, the conformation of the complex In the rapidly mixed system is presumed to consist of three structural parts the normal single helix (A), the side-by-side associated helices (B) and the entangled packet around Intermolecular junction (C). Thereby, the C part Includes the subsidiarily created junction by intermolecular entanglement In the complexatlon besides the authentic junction existing in uncomplexed amylose. The complex in the slowly mixed system Is composed of two structural parts for amylose with DP less than 1000 and three structural parts for higher DP amylose the normal single helix (A), a braided double helix (A ) and the entangled packet around Intermolecular junction (C). 

In the slowly mixed system, the complex conformation is characterized by a worm-like helical chain or a randomly oriented zig-zag rod accompanied by the formation of braided double helices. The intramolecular side-by-side association of helices and inter-molecular entanglement are scarely developed due to the fractional mixing with a long interval periods exceeding the relaxation time for the rearrangement of hydrogen bonds. This may result in the exclusive formation of the A and A species by suppressing the formation of the B species due to extinction of the C species as an anchor. 

An existence of restraining force between polymer chains other than covalent braiding viz., entanglements, presence of microcrystaUinity, and glassy blocks in block copolymer. 

Fig. 4. Tg and 7y from torsional braid analysis. TBA, (/ = 1 Hz) and differential scanning calorimetry, DSC, (30 K/min) from ref. 11. M, entanglement molecular weight. For ar-PS,M M =...

Fig. 7. Transition temperature - log My, plot for the glass and the liquid-liquid transitions in polyisobutylene, (x) TSC, ( ) Differential Scaiming Calorimetry (ref. 77), ( ) Adiabatic Calorimetry (ref. 77), ( ) Torsional Braid Analysis (ref 77), and (O) Melt Viscosity (ref 77). Mg is the critical molecular weight for chain entanglement.

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