Abstract
While numerous efforts have been put forth to correlate the morphology of microphase-separated diblock and triblock copolymers with molecular characteristics such as composition and chain length, far fewer studies have been devoted to elucidating the role of molecular architecture on microstructure in more complex linear copolymers. This is particularly surprising since many segmented copolymers, for example, have found their way into commercial applications. In this work, we present some of our recent work to bridge the gap between well-defined di/triblock copolymers and segmented copolymers. Here, a novel set of well-defined linear (AB) n multiblock copolymers possessing equal compositions and chain lengths, but different numbers of AB block pairs (n= 1,2,3,4), have been synthesized. Their microphase-separated morphologies have been characterized using both transmission electron microscopy (TEM) and small-angle x-ray scattering (SAXS). A recently-developed thermodynamic model based on confined-chain statistics is presented, and predictions are found to compare well with experimental data.
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