3 years ago

Supramolecular Self-Assembly of Monocarboxydecyl-Terminated Dimethylsiloxane Oligomer

Supramolecular Self-Assembly of Monocarboxydecyl-Terminated Dimethylsiloxane Oligomer
Arantxa Arbe, Juan Colmenero, Gerardo Martínez-Rugerio, Angel Alegría
The supramolecular self-assembly of monocarboxydecyl-terminated dimethylsiloxane oligomer is investigated and characterized by combining different experimental methods. Thermodynamic properties were accessed by temperature-modulated differential scanning calorimetry, and two subambient phase transitions were identified. Fourier transform infrared spectroscopy gave access to the main molecular entities involved in these phase transitions. Diffraction experiments using small-angle X-ray scattering and wide-angle X-ray scattering evidenced the development of two distinct well-ordered sub-10 nm structures, each associated with one of the thermal transitions, without any indication of long-range atomic order. All the results point to the self-assembly of the oligomeric dimers below 230 K, giving rise to supramolecular structures involving new H-bonding interactions. A further structure is developed below 205 K by the assembly of the alkane part of the molecules in an arrangement of hexagonally packed cylinders. Dielectric relaxation experiments evidenced both the pronounced effect of the lowest temperature transition on the H-bond network fluctuations and the very effective segregation of dimethylsiloxane at lower temperatures. Moreover, we found that the structured liquid presents a rubber-like mechanical behavior in the temperature range 150–200 K, where dimethylsiloxane phase remains amorphous, and at lower temperatures a glassy nanostructured material is found.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b01910

DOI: 10.1021/acs.macromol.7b01910

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.