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Effect of architecture on the tensile properties of triblock copolymers in a lamellar phase.
Authors:Rui Huang  Ying Jiang  Haojun Liang
Institution:Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China, Hefei Anhui, 230026, P.R. China.
Abstract:We have used self-consistent field theory to calculate the tensile moduli of triblock copolymers in lamellar microstructures prepared from linear and star architectures. The extensional moduli K(33) are the main contributors to the tensile moduli, and the contribution of K(U)33 (the internal energy contribution to K(33)) is the main component of the value of K(33). We find that the tensile moduli of ABC three-miktoarm star terpolymers are smaller than those of ABC linear triblock copolymers having identical components, presumably for two main reasons. First, for the ABC three-miktoarm star terpolymers, the contributions of K(U)33 are larger than those of the linear triblock copolymers; we attribute this phenomenon to the star terpolymers having smaller lamellar domain sizes at equilibrium relative to those of the linear triblock copolymers. Second, conformational entropies play an important role in affecting the tensile moduli, mainly because of the different degrees of freedom of the various chains. In contrast, the shear moduli contribute negligibly to the tensile moduli.
Keywords:lamella  mechanical properties  polymers  structure–property relationship  tensile modulus
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