Rheological Properties of Personal Lubricants
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In this study, a number of lubricants were assessed for their rheological properties, and qualitative correlation with sensory experience was made. The lubricants contained various structurants including xanthan, hydroxyethyl cellulose, carboxymethyl cellulose and carbomer. A range of shear thinning behaviour was found, with the samples containing xanthan gum showing the highest degree of shear thinning behaviour and the highest degree of gel-like behaviour. The non-water-based lubricants which contained silicon oil or glycerin showed the lowest viscosities and relatively little shear thinning. On cooling, samples containing hydroxyethyl cellulose showed a crossover temperature where G′ became higher than G′′, suggesting a transition from a more liquid-like behaviour to a more solid-like behaviour. The crossover temperature was higher for samples which exhibited higher steady shear viscosities. The rheological measurements correlated with sensory data that the xanthan-based lubricant could be easily spread and had a more ‘solid’ feeling with little tendency to drip or flow.
KeywordsLubricant Rheology Friction
The authors would like to thank Andrew Lai Eng Khiong and Tee Kok Wee from Curtin University Sarawak for performing the experiments.
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