Polymer Design for Biomedical Drug Delivery Systems

Polymeric carriers have transformed the delivery of therapeutic agents by combining precise control over composition with biocompatibility and tunable degradation rates. Modern designs employ amphiphilic block copolymers that self-assemble into nanoscale micelles or vesicles, offering a hydrophobic core for drug loading and a hydrophilic corona to confer colloidal stability and minimise immune recognition. Advances in ring-opening polymerisation have enabled the incorporation of functional monomers, yielding materials responsive to pH, temperature or redox potential. Surface modifications, such as polyethylene glycol grafting or targeting ligand conjugation, further refine circulation half-life and site-specific uptake. Beyond simple encapsulation, polymer–drug conjugates covalently link active compounds to the backbone, enhancing solubility and providing controlled release profiles. Emerging architectures include dendrimers, nanogels and stimuli-sensitive hydrogels, each offering distinct release kinetics and mechanical properties. Such systems address key challenges in oncology, vaccination and gene therapy by improving bioavailability, reducing off-target toxicity and enabling sequential or combination therapies. Ongoing efforts focus on scalable synthesis, biodegradation by‐products and regulatory compliance, ensuring that novel polymer designs can transition from laboratory prototypes to clinical applications with robust safety and efficacy profiles.

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Polymer Design for Biomedical Drug Delivery Systems publication trend

The graph below shows the total number of articles in polymer design for biomedical drug delivery systems across all publications each year (not limited to Nature Index journals).

Technical terms

Amphiphilic block copolymer: A macromolecule composed of covalently linked hydrophilic and hydrophobic segments that self-assemble into organised nanostructures in aqueous media.

Micelle: A nanosized core–shell aggregate formed by amphiphilic molecules, with a hydrophobic interior for drug encapsulation and a hydrophilic exterior for steric stabilisation.

Ring-opening polymerisation (ROP): A polymerisation technique that opens cyclic monomers to form linear polymers, offering precise control over molecular weight and functional group incorporation.

Stimuli-responsive: Materials engineered to undergo physical or chemical changes—such as swelling, degradation or cargo release—in response to environmental triggers like pH, temperature or redox conditions.

Polymer–drug conjugate: A system in which a therapeutic molecule is covalently bonded to a polymer backbone to improve solubility, circulation time and targeted delivery.

References

1. Maleimide functionalized polycaprolactone micelles for glutathione quenching and doxorubicin delivery. Chemical Science (2024).
2. Recent Advances in Polycaprolactones for Anticancer Drug Delivery. Pharmaceutics (2023).
3. Effect of aromatic substituents on thermoresponsive functional polycaprolactone micellar carriers for doxorubicin delivery. Frontiers in Pharmacology (2024).