Abstract: Branched polyesters carrying dendrons are a useful class of nanomaterials which exhibit good handling properties and stability, can degrade to a high extent, and are effective encapsulation materials. They can be used to make nanoprecipitated particles which may for example be used in therapy. Furthermore, these materials can be synthesised by economical and tailorable processes. The materials can be prepared by the ring-opening polymerisation (ROP) of mono-functional lactone monomers and difunctional lactone monomers, using dendron initiators.