JOURNAL OF COSMETIC SCIENCE 184 Table IV Volume Difference Data for Hair Treated with Various Polymers ΔV (cm3) VP/acrylates/lauryl methacrylate copolymer 22.67 ± 3.52 VCL/VP/DMAEMA copolymer 40.10 ± 6.36 Polyquaternium-69 25.07 ± 5.72 Isobutylene/ethylmaleimide/hydroxyethylmalemide copolymer 33.67 ± 17.36 VP/VCL/DMAPA acrylates copolymer 40.33 ± 16.30 High MW Polyimide-1 22.37 ± 13.54 Polyimide-1 56.93 ± 16.62 PVP K90 81.17 ± 16.60 PVP K30 154.30 ± 12.38 Figure 11. Straight hair technique. Three-dimensional surface plots for hair treated with PVP K30 (a) be- fore and (b) after exposure to 90% RH. Tests were conducted using the conventional hair tress technique. ΔV represents the difference in volume before and after humidity exposure. Each value represents the average of three measurements and is reported with standard deviation.

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