8 citations
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December 2003 in “Materials Research-ibero-american Journal of Materials” Polyquaternium 7® builds up on hair, improving its look and feel, and AFM is good for measuring these changes.
January 2010 in “EPub Bayreuth (University of Bayreuth)” This study found that Polyquaternium-87 significantly reduced friction forces on hair surfaces treated with various shampoo formulations, highlighting its potential for improving hair care products.
2 citations
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January 2004 in “PubMed” This study concluded that Polyquaternium-10 conditioner softens the surface of the scale face on hair fibers.
13 citations
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March 2006 in “International Journal of Cosmetic Science” The study found that a polymer treatment changes the charge on hair surfaces, making bleached hair smoother and less porous.
4 citations
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November 2017 in “Journal of Cosmetic Dermatology” This study found that polyquaternium-68 at pH 9 achieved the greatest hair deposition, while polyquaternium-44 demonstrated the best wash resistance at pH 6.