THE CHALLENGE
Poly(olefin sulfone)s (POSs) offer a uniquely tunable combination of high polarity, high glass transition temperatures, thermal and oxidative stability, and chemical robustness, enabling potential applications in semiconductor technologies, advanced battery components, high-performance gas-separation membranes, and next-generation engineering plastics. Derived from cheap and abundant monomers—alkenes and sulfur dioxide—POSs have the potential to replace legacy materials and enable new technologies. Additionally, they can be degraded back to monomers under alkaline conditions or irradiation at elevated temperatures. However, their widespread adoption has been limited by the difficulty of achieving controlled and predictable molecular weights, managing side reactions and degradation pathways, and reliably producing materials with targeted molecular weights and properties. Current free radical polymerization methods cause the polymers to grow at unequal rates, leading to extremely high molecular weights and broad size distributions, which translate into inconsistent performance and limited ability to design advanced products. A lack of reactive chain ends enabling the formation of POS block copolymers has also prevented their application to materials with nanoscale features.
OUR SOLUTION
We offer a controlled method for synthesizing poly(olefin sulfone)s using an innovative allyl sulfone-mediated reversible addition-fragmentation chain transfer (AS-RAFT) polymerization process. This reversible-deactivation radical polymerization process is photochemically initiated, allowing for living polymerization characteristics such as predictable molar mass evolution, first-order kinetics, and low dispersity. The system is highly tunable: the electronic nature of the aromatic Z-group on the allyl sulfone chain transfer agents can be adjusted to optimize propagation rates and chain transfer efficiency, while the process parameters (such as temperature and irradiation wavelength) are optimized for precise control over polymer architecture and functional chain ends. This technology can enable the production of well-defined POSs with tailored properties, including the ability to form block copolymers while retaining functional chain ends for further modification. This versatility and precision open new avenues for sustainable and advanced polymer applications.
Figure: Overview of the invention.
Advantages:
Potential Application: