Thermal data measured by DSC for blends of PLLA with PLCL(70:30)-PEG or PLCL(80:20)-PEG, either before (Fig01) or after (Fig08) degradation. Contains Microsoft Excel files with Tg measurements and experimental details, as well as measured changes in enthalpy of relaxation after degradation. Example raw DSC curves are also given (.txt format), as well as script and data files for generating plots (.txt). Molecular weight distributions for blends of PLLA with PLCL(70:30)-PEG or PLCL(80:20)-PEG, measured by GPC, either before (Fig02) or after (Fig06) degradation. Contains Microsoft Excel files with raw GPC curves. Average molecular weights are also given in a Microsoft Excel file (Table01). Measured distributions for blends are compared with a calculated distribution based on a linear combination of individual blend components. Script and data files for generating plots (.txt) are also included. Mechanical testing data from tensile tests of blends of PLLA with PLCL(70:30)-PEG or PLCL(80:20)-PEG (Fig03). Tests were carried out before degradation in the dry state, before degradation in 37°C water, and after degradation in 37°C water. Contains Microsoft Excel files with measured properties and example stress-strain curves, as well as script and data files for generating plots (.txt). Degradation pH measurements from degradation of blends of PLLA with PLCL(70:30)-PEG or PLCL(80:20)-PEG in PBS at 37°C (Fig04 and Fig05). Contains Microsoft Excel files with raw pH measurements over time, as well as photographs of polymer samples during degradation. Script and data files for generating plots (.txt) are also included. Raw SEM images (.tif) of an 80:20 blend of PLLA and PLCL(70:30)-PEG before and after degradation are included (Fig07). Crystallinity data measured by XRD for blends of PLLA with PLCL(70:30)-PEG or PLCL(80:20)-PEG, either before (FigS1) or after (Fig09) degradation. Contains Microsoft Excel files experimental details, and sample codes. Example raw XRD patterns are also given (.uxd format), as well as script and data files for generating plots (.txt). Plots are generated using gnuplot (www.gnuplot.info),