Programmable Lifetime Polymers

Engineering stability, degradation and circularity through molecular design

The lifetime of a polymer should never be accidental—it should be engineered.

Whether a material is designed to remain stable for decades in an engineering application, degrade after one growing season in agriculture, or safely disappear after delivering a therapeutic, its lifetime should be programmed at the molecular level. At SPC, we develop programmable lifetime polymers, where stability, transformation and end-of-life behaviour are intrinsic material properties rather than consequences of ageing.

Our research combines modern organic and inorganic chemistry, precision polymer synthesis and advanced polymer characterization to establish predictive structure–function–fate relationships. By understanding how molecular architecture governs degradation, self-assembly, interfaces and recycling, we aim to transform degradation from an afterthought into a powerful design principle.

Polyphosphoesters – Nature's Blueprint for Sustainable Polymers

Inspired by DNA and RNA, our group has pioneered the development of polyphosphoesters (PPEs) as one of the most versatile classes of sustainable polymers. The phosphate linkage provides a unique molecular handle to control polymer properties, enabling precise tuning of hydrolytic stability, enzymatic degradation, self-assembly, responsiveness and interfacial interactions.

Today, PPEs represent one of SPC's core research platforms. We develop new synthetic methodologies, greener phosphorus chemistry and circular phosphorus concepts while continuously expanding their functionality. Recent work has demonstrated biodegradable ³¹P MRI imaging agents (Nature Communications, 2023), RNA-inspired degradation mechanisms that enable precise lifetime control (Chemical Science, 2021), advanced flame-retardant polymers, antifouling coatings and functional nanocarriers. Their unique combination of functionality and degradability makes PPEs an attractive platform for applications ranging from healthcare to sustainable materials and future engineering systems.

Molecular Design Controls Lifetime

The central question in our research is deceptively simple:

How does molecular structure determine polymer lifetime?

To answer this, we investigate how backbone chemistry, side-chain functionality, polymer architecture, supramolecular interactions and morphology influence hydrolysis, enzymatic degradation and environmental stability.

Rather than describing polymers simply as "biodegradable", we seek quantitative relationships between molecular design and degradation behaviour. This enables us to engineer polymers that remain stable throughout their service life while transforming predictably under predefined conditions.

Beyond Biodegradability

Biodegradability is often treated as a material label, although degradation strongly depends on the surrounding environment. At SPC, we therefore combine molecular polymer chemistry with standardized biodegradation studies in soil, waters and compost to understand where, how fast and by which mechanisms materials transform. Our goal is to establish predictive design rules that connect molecular structure directly to environmental fate. This research forms the basis of our emerging Polymer Fate Engineering platform and supports the development of sustainable polymers for applications where recovery after use is impossible.

Controlling polymer lifetime requires precise control over polymer structure.

SPC has a long tradition in living and controlled polymerization techniques, sequence-controlled polymers and advanced macromolecular architectures. Our research established new monomer families for living anionic polymerization, enabling access to previously inaccessible polymer structures and sophisticated sequence-controlled copolymers. More recently, these concepts have evolved towards precision polymer synthesis for sustainable materials, allowing us to tailor degradation, functionality and self-assembly through molecular design.

Today, this synthetic expertise underpins all research activities within SPC, from polyphosphoesters and lignocellulosic polymers to advanced functional materials and environmental delivery systems.

Selected Highlights

• RNA-inspired degradation pathways in polyphosphoesters (Chemical Science, 2021) – revealing how molecular structure programs degradation kinetics.
• Metal-free biodegradable ³¹P MRI imaging agents (Nature Communications, 2023) – combining advanced functionality with intrinsic biodegradability.
• Advanced polyphosphoester materials – including flame retardants, antifouling coatings, responsive polymers and functional interfaces.
• Towards circular phosphorus chemistry – developing greener synthetic routes and recyclable phosphorus-containing polymers.