On the dynamics of stiff polymers in a melt

摘要

Chain length dependencies of relaxation times of stiff polymers in nonordered melts are studied both by computer simulation and experimentally. Simulations are performed using the cooperative motion algorithm (CMA). Two kinds of simulated systems are considered with different origin of chain stiffness. In one case, the stiffness is introduced by reduction of accessibility of some conformation angles and in the other case by a large number of side chains anchored to the backbone. Experimental results for melts of poly(p-phenylene) chains with flexible short side chains are obtained using rheological measurements in the terminal relaxation zone. Experimental and simulation results for relevant systems show a good argeement of dependencies of the chain relaxation times on chain length.