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We report results of a detailed experimental investigation into the drying ofsessile droplets of aqueous poly(ethylene oxide) (PEO) polymer solutions undervarious experimental conditions. Samples are prepared with a range of initialconcentrations c_0 and are filtered to remove traces of undissolved PEOclusters. In typical experiments, droplets with initial volumes between 5\muLand 50\muL are left to evaporate while temperature and relative humidity aremonitored. Droplets either form a disk-like solid "puddle" or a tall conical"pillar". The droplet mass is monitored using a microbalance and the dropletprofile is recorded regularly using a digital camera. Subsequent processing ofthe data allows values of droplet volume V, surface area A, base radius R,contact angle {\theta} and height h to be determined throughout drying. Fromthis data we identify four stages during pillar formation: pinned drying;pseudo-dewetting; bootstrap building; solid contraction and propose physicalmodels to explain key aspects of each stage and to predict the transition fromeach stage to the next. The experimental parameters of relative humidity,temperature, pressure, droplet volume and initial contact angle are allsystematically varied and observed to influence the drying process andconsequently whether the droplet forms a pillar or a puddle. We combine theseparameters into a dimensionless P\'eclet number Pe, which compares the relativeeffects of evaporation and diffusion, and show that the drying behaviour isonly dependent on c_0 and Pe.

Drying and deposition of poly(ethylene oxide) droplets determined by P\'eclet number