Effects of a Nematic-Like Interaction in Rubber Elasticity Theory

NMR Reveals Non‐Distributed and Uniform Character of Network Chain Dynamics

“…This interpretation now provides a rationale for the non-observation of substantial distribution effects on residual couplings between protons measured by MQ spectroscopy, and such observations may provide a crucial test criterion for refined theories of chain dynamics and rubber elasticity. An earlier model of rubber elasticity that might in fact conform with our findings is that of Jarry and Monnerie, [52] who assumed that the chain entropy is influenced by nematic-like inter-chain interactions. In their model, only chain orientation (as observed in NMR, or by strain birefringence) is affected, but not the stress-strain behavior.…”

Polymer Crystallization Driven by Anisotropic Interactions

“…Several authors [23][24][25][26][27] have reported improved estimates of Z conf that take into account the effect of local ordering at low temperatures; however, the resulting improvement in the prediction of the Polymer Crystallization Driven by Anisotropic Interactions 5 melting point is not very large [22]. Another approach in the calculation of configurational entropy of semiflexible lattice chains was suggested by DiMarzio [28] and was expanded by Ronca [29], and this has been found useful in the study of orientational relaxation of stretched polymer liquids [30][31][32].…”

Numerical Verification of Analytical Results for Statistical Description of Polymer Chains in Nematic Systems

“…A comparison of gammas obtained by using Equations (8) and (9) and by numerical solutions of Equations (3) for various u values is illustrated in Figures 1 and 2.…”

“…[2] The model was also applied by Jarry and Monnerie to nematic polymer systems. [9] In their model one of the end-to-end chain distances is directed along the system nematic axis. The same model is applied in the work presented here.…”