Transient entanglement mechanism

As described for the transient entanglement mechanism, DNA molecules, in the short term, intertwine with the polymer-adsorbed on the GNPs. There are reasons where slowing the entanglement of DNA fragments may be desired. First, polymer-adsorbed on the GNPs are stiffer and less extended. 

The slower rise and decay of normal stress transients compared to shear stress arises quite simply and directly from the polydispersity of relaxation times (78), and probably has no direct bearing on entanglement mechanisms per se. Likewise, the depression of the superimposed moduli at low frequencies follows from rather non-specific continuum models, the loss moduli by Eqs.(8.49) and (8.50) from the simple fluid model, and the storage moduli from the following properties of the more specific but still quite general BKZ model (366,372) ... 

Barron, A.E., Blanch, H.W., and Soane, D.S., A transient entanglement coupling mechanism for DNA separation by capillary electrophoresis in ultradUutepolymer solutions. Electrophoresis, 15,597,1994. 

The molecular entities of VOCCs have been well characterized. Ten distinct genes have so far been cloned, six of which have been identified in smooth muscle (Hofmann et al 1999, Ertel et al 2000). In contrast, the molecular counterparts of ROCCs and CCE have long been elusive, due probably to the lack of specific ligands/blockers and the presence of complex entangled regulatory mechanisms. The transient receptor potential (TRP) protein gene... 

Fig. 11). It is, therefore, highly probable that the bulky filler particles impose geometrical hindrances (entropy constraints) for the chain dynamics at the time scale of the NMR experiment (of the order of 1 ms). This effect may be compared with the effect of transient chain entanglements on chain dynamics in polymer melts. It should be remarked that the entanglements density estimated for PDMS melts by NMR is close to its value fi om mechanical experiments [38]. Therefore, it can be assimied that topological hindrances from the filler particles can also be of importance in the stress-strain behavior of filled elastomers. 

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