Mesophase flow-induced

Fathollahi, B. and White, J. L., Polarized-light observations of flow-induced microstructures in mesophase pitch, JRheol, 1994,38(5), 1591-1607. 

As seen in Fig. 10, the larger the pitch, the slower the rate the modulus evolution. The modulus of the right-handed mesophase (AEC-4) developed faster than that of the left-handed mesophase (AEC-1) with similar pitch. The difference in relaxation behavior of the AEC solutions may be because of the smaller driving force to reform helicoidal structures of chiral nematic phases from flow-induced nematic mesophases for the mesophases with larger pitch (nematic-like). 

Brochard and de Gennes [67] discussed theoretically a flow-induced isotropic-mesophase transition in a polydisperse polymer system occurring through spinodal decomposition. Following Maier-Saupe s [50] theory of the nematic phase, the orientation-dependent interaction energy was taken as... 

In this section, we review three representative cases of flow-induced mesophases. PET serves as an example of a semi-rigid polymer with intrinsic rigid building blocks. The shear-induced smectic ordering in the flexible-chain polymer iPP provides a special case of induced rigidity, which is still far from fully understood. PDES has been chosen as an example of a stretch-induced condis crystal. Various experimental techniques have been employed to characterize flow-induced mesophases. While scattering methods probe the ordering, a direct technique to measure the molecular mobility is nuclear... 

In flow-induced crystallization of polymers, the occurrence of an intermediate mesophase before the onset of the crystallization itself has a profound influence on the process, which we shall consider in this section. As mentioned above, due to the non-thermodynamic nature of the processes involved we encounter a biphasic coexistence of a partially ordered mesophase and the... 

---