In the presence of denaturing solvent

solutions of polypeptide can be liquid crystalline at room temperature.They may undergo an anisotropic-isotropic transition at low temperatures where the intramolecular helix-coil transformation occurs.On the basis of Florys lattice model and Zimm-Bragg's notion for the helix-coil transition

a theory considering the above phenomenon has been proposed.In this work

such theory was further developed by replacing the axial ratio x with the Kuhn chain axial ratio xk which is temperature-dependent. The calculation results show that an improved agreement between the theory and the experimental data has been achieved

and an appreciable influence on the phase behavior from both chain rigidity and polymer-solvent interaction parameterχwas found. Finally

the temperature effect on orientational parameter S was also studied. The information obtained through the investigation may find important applications

such as envisaging new routes for processing the rigid-flexible block copolymer with better mechanical properties

and helping to understand bioprocesses in the life phenomena.