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Issue 20, 2018
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Discrete oligodimethylsiloxane–oligomethylene di- and triblock co-oligomers: synthesis, self-assembly and molecular organisation

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Abstract

A new class of discrete-length block co-oligomers comprising oligodimethylsiloxane (oDMS) and oligomethylene (oM) is presented. For this, oM blocks containing up to 69 backbone carbons are synthesised via an iterative, Wittig reaction-based strategy. Ligation with oDMS hydrides permits the formation of a library of block co-oligomers (BCOs) in which the block configuration, MW, and composition can be tuned. Differential scanning calorimetry and small-angle X-ray scattering show that all BCOs exhibit microphase separation into well-ordered lamellar morphologies, driven by the crystallisation of the oM blocks. Pre-melting order–order transitions are present for a number of BCOs, resulting in an alteration of the oM crystal packing as well as in changes of the overall microphase-segregated structure. As a result of the discrete nature of the BCO chains, we propose models that describe the molecular organisation within the microphase-segregated structures by evaluating the changes in the lamellar thickness upon varying the BCO architecture.

Graphical abstract: Discrete oligodimethylsiloxane–oligomethylene di- and triblock co-oligomers: synthesis, self-assembly and molecular organisation

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Article information


Submitted
03 Mar 2018
Accepted
17 Apr 2018
First published
19 Apr 2018

Polym. Chem., 2018,9, 2746-2758
Article type
Paper

Discrete oligodimethylsiloxane–oligomethylene di- and triblock co-oligomers: synthesis, self-assembly and molecular organisation

B. van Genabeek, B. F. M. de Waal, A. R. A. Palmans and E. W. Meijer, Polym. Chem., 2018, 9, 2746
DOI: 10.1039/C8PY00355F

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