Silicone deposition on bleached Asian hair

Hair is easily damaged by a variety of mechanisms including environmental exposure, mechanical abrasion and chemical processing, such as bleaching. Unlike undamaged hair, bleached hair is more hydrophilic and has a higher combing force, which is why conditioning is needed in most cases. Cationic polymers have been found to be efficient at depositing on bleached hair as well as improving its combability during the wet stage. Adsorption has been attributed to an electrostatic attraction between the anionic character of the hair fibre and cationic polymers. On the contrary, silicone has a totally different deposition mechanism. The silicone droplets spread and form a uniform thin coating much easier on hydrophobic hair fibres than on hydrophilic hair fibres. The conditioning shampoo deposits much less silicone on bleached hair than on undamaged hair.8 As shown in Figure 4, conditioning shampoos without polymers or containing PQ-10 deposited almost no silicone on bleached hair for all silicone emulsion types. The polyAPTAC-ACM/GHPTC mixture deposited the most SPS and LPS/SPS silicone and similar amounts as GHPTC for ADM silicone, whereas LPS silicone has almost no deposition and is not suitable for use on bleached hair. The commercial product we tested in this experiment does not deposit enough silicone on bleached hair. The results for silicone build-up on bleached hair after five washings are shown in Figure 5. No silicone build-up was found in all experiments, and the deposition results were similar to hair samples after just one wash.
source from https://www.personalcaremagazine.com