A series of amphiphilic block copolymers composed of poly(ethylene oxide) and poly(lactic acid) (PEO-PLA) were synthesized and their solution properties studied using dynamic light scattering. These materials were found to self-assemble in aqueous media with the hydrodynamic radius increasing with increasing hydrophobic fraction. In order to ascertain the potential for these materials to increase the efficiency of biopesticide delivery to plants and trees, block copolymers were adsorbed onto colloidal polystyrene and the thickness of the adsorbed layer determined from changes in the hydrodynamic size. The adsorbed thickness ranged from 4 – 15 nm with varying block ratio, polymer concentration and colloid size. The trends fit well with theoretical models for adlayer thickness, with the exception of the smallest colloids. In these systems, we propose that the colloids may become encapsulated into the block copolymer micelle. In a related project, the Savin and Guo groups are developing an efficient protocol to extract and polymerize lactic acid from fermented whey permeate.