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Dispersity under Scrutiny: Phase Behavior Differences between Disperse and Discrete Low Molecular Weight Block Co-Oligomers.

ABSTRACT: An experimental study is presented in which we compare the bulk phase behavior of discrete and (partially) disperse diblock co-oligomers (BCOs) with high ?-low N. To this end, oligomers of dimethylsiloxane (oDMS) and lactic acid (oLA) were synthesized, each having either a discrete number of repeat units or a variable block length. Ligation of the blocks resulted in oDMS-oLA BCOs with dispersities ranging from <1.00001 to 1.09, as revealed by mass spectroscopy and size exclusion chromatography. The phase behavior of all BCOs was investigated by differential scanning calorimetry and small-angle X-ray scattering. Compared to the well-organized lamellae formed by discrete oDMS-oLA, we observe that an increase in the dispersity of these BCOs results in (1) an increase of the stability of the microphase-segregated state, (2) a decrease of the overall degree of ordering, and (3) an increase of the domain spacing.

SUBMITTER: van Genabeek B 

PROVIDER: S-EPMC5526650 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Dispersity under Scrutiny: Phase Behavior Differences between Disperse and Discrete Low Molecular Weight Block Co-Oligomers.

van Genabeek Bas B   de Waal Bas F M BFM   Ligt Bianca B   Palmans Anja R A ARA   Meijer E W EW  

ACS macro letters 20170614 7

An experimental study is presented in which we compare the bulk phase behavior of discrete and (partially) disperse diblock co-oligomers (BCOs) with high χ-low <i>N</i>. To this end, oligomers of dimethylsiloxane (<i>o</i>DMS) and lactic acid (<i>o</i>LA) were synthesized, each having either a discrete number of repeat units or a variable block length. Ligation of the blocks resulted in <i>o</i>DMS-<i>o</i>LA BCOs with dispersities ranging from <1.00001 to 1.09, as revealed by mass spectroscopy  ...[more]

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