Controlling the topology of a polymer is essential in determining its physical properties and processing. Even after numerous studies, obtaining a diverse array of topologies, particularly within the framework of hyperbranched systems, remains challenging. Here, we propose a synthetic approach to obtain highly tunable hyperbranched polyglycidol (hb-PG) using a frustrated Lewis pair of pyridine or tributylamine along with tris(pentafluorophenyl)borane, B(C6F5)3, that not only influences the preferred activated monomer mechanism through hydrogen bonding with the glycidol monomer, but also facilitates the formation of unique polymer topologies. Notably, the frustrated Lewis pair containing pyridine was found to yield a branched polymer carrying cyclic structures (branched cyclic polymers) with an increased degree of branching, whereas the more sterically hindered tributylamine yielded hb-PG without a cyclic structure; these results were confirmed by MALDI-ToF analyses. Based on the unique topologies of the PGs, significant correlations between the topology and the bulk and solution states were investigated using SEC, DSC, and 1H NMR diffusion-ordered spectroscopy.
|Number of pages||10|
|Publication status||Published - 2022 Mar 7|
Bibliographical noteFunding Information:
We thank Dr Kyung-Youl Baek of the Korea Institute of Science and Technology (KIST) for his insights into 1H DOSY NMR spectra. This study was supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No. 20011123) and the Korea Research Institute of Chemical Technology (KRICT) (No. KS2041-00). This work was also supported by the National Research Foundation of Korea (NRF-2021R1A2C3004978).
© 2022 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Organic Chemistry