PolyVivo AK33,AK40,AK38,AK20 Water Solubility?

PolyVivo AK33, AK40, and AK38 block copolymers do not easily dissolve in water however they are partially soluble. When left as 5% w/v solutions in Di H2O with shaking in cold condition (best way to dissolve PEG block co-polymers) AK38/AK40 were observed to be clearly softened/reduced in quantity (partially soluble), AK33's appearance was unchanged but the water surrounding it was soapy looking (indicates some block copolymer as they behave like surfactants). Polyvivo AK20 is completely water insoluble however.