Phase Morphology of Multiblock Copolymers Differing in Sequence of Blocks

Abstract

The chemical nature, the number length of integrated building blocks, as well as their sequence structure impact the phase morphology of multiblock copolymers (MBC) consisting of two non‐miscible block types. It is hypothesized that a strictly alternating sequence should impact phase segregation. A library of well‐defined MBC obtained by coupling oligo(ε‐caprolactone) (OCL) of different molecular weights (2, 4, and 8 kDa) with oligotetrahydrofuran (OTHF, 2.9 kDa) via Steglich esterification results in strictly alternating (MBCalt) or random (MBCran) MBC. The three different series has a weight average molecular weight (Mw) of 65 000, 165 000, and 168 000 g mol−1 for MBCalt and 80 500, 100 000, and 147 600 g mol−1 for MBCran. When the chain length of OCL building blocks is increased, the tendency for phase segregation is facilitated, which is attributed to the decrease in chain mobility within the MBC. Furthermore, it is found that the phase segregation disturbs the crystallization by causing heterogeneities in the semi‐crystalline alignment, which is attributed to an increase of the disorder of the OCL semi‐crystalline alignment.

Dimensionally stable multication-crosslinked poly(arylene piperidinium) membranes for water electrolysis

“…This can be attributed to the introduction of multications that promote the aggregation of the ions, thereby enhancing micro-phase separation. 21,42,43 Notably, with increasing content of the multication crosslinker, a larger domain size is observed. Besides, with the increasing content of the multication crosslinker, there is another peak appearing around 0.64 nm −1 for C-IL-60, C-IL-80 and C-IL-100.…”

High‐Throughput and Combinatorial Approaches for the Development of Multifunctional Polymers

“…Reproduced under terms of the CC‐BY license. [ 109 ] Copyright 2021, Helmholtz‐Zentrum Geesthacht, published by Wiley‐VCH GmbH.…”

“…Complex moduli IE*| of MBC as a function of temperature, OCL weight content, and chain length of OCL building blocks. Reproduced under terms of the CC-BY license [109]. Copyright 2021, Helmholtz-Zentrum Geesthacht, published by Wiley-VCH GmbH.…”