FIGURE 3.
(color online) Effect of regioregularity on the thermodynamic stability of the nematic-to-isotropic transition in P3HT. The solid line is the theoretical prediction of the nematic-toisotropic transition, the broken lines correspond to the predicted equilibrium crystal melting lines as a function of chain length n and mole fraction of regioregular couplings p determined from Eq. 9 using the values for the a and b parameters employed in Fig. 1. (Error estimates would be similar to that of Fig. 1.)