Abstract
Poly(dimethylsiloxane) (PDMS)-based bottlebrush polymers, PDMS-g-PDMS, have been synthesized by anionic polymerization in combination with a condensation-based grafting reaction. Bottlebrush polymers show intriguing features, e.g., extremely low viscosities. Hereby, studies of their dynamics are rare. Therefore, we focus on the segmental relaxation by broadband dielectric spectroscopy. An increasing cross-sectional radius proportional to the increasing side chain length has been observed by small-angle neutron scattering over three samples. A comparison of the segmental relaxation times of the bottlebrushes with the respective linear chains reveals slower dynamics in the former. For longer chains, this effect vanishes.
| Original language | English |
|---|---|
| Pages (from-to) | 8450-8458 |
| Number of pages | 9 |
| Journal | Macromolecules |
| Volume | 53 |
| Issue number | 19 |
| DOIs | |
| State | Published - Oct 13 2020 |
| Externally published | Yes |
Funding
We acknowledge funding by the U.S. Department of Energy (DoE) under grant DE-SC0019050. We are also grateful for access to the neutron scattering instruments, provided by the Australian Nuclear Science and Technology Organisation (ANSTO).