Formulation and processing of novel non-aqueous polyethylene glycol-in-silicone oil (o/o) phase change emulsions

Oil-in-oil phase change emulsions, composed of materials (PCMs) dispersed in a continuous oily medium, have never been reported the literature. The current study involves formulation, stabilisation and characterisation novel anhydrous emulsions polyethylene glycol (PEG4000) as PCM silicone oil. Emulsions with different concentrations were evaluated by analysing viscous flow properties, optical microscopy modulated differential scanning calorimetry. results evidence that can be pre-stabilised at 80 °C, under high shear conditions, selecting an adequate surfactant but undergo severe destabilisation after cooling heating cycle. Nevertheless, post-processing protocol (low agitation °C for 24 h) leads to thermal cycle resistant storage stable non-aqueous dispersions. This process gives rise reduction shear-thinning character emulsion, shifts melting crystallization temperature PEG4000 lower values reduce its crystallinity. is attributed partial compatibility crystalline fraction other compounds emulsion.