Exposure to air is considered a significant external stressor for hair, which can cause damage to the cuticle (higher dry/wet combing energy), protein degradation, and a more hydrophilic hair surface.
Compared to leave-in products, rinse-off products, such as shampoos, are more challenging to achieve anti-pollution benefits due to surfactants and the rinse process during hair washing. A recently developed conditioning and deposition mechanism was found to be effective in protecting hair from rinse-off product contamination. Use containing 0.2 wt. % acrylamidopropyl ammonium trichloride/acrylamide copolymer (APTAC/ACM) silicone-free shampoo-washed hair tresses show greater protein degradation following smoke exposure after first shampooing than unwashed hair tresses The delivery time was reduced by 3 times. Effect of 0.2% by weight of conventional conditioning polymer polyquaternium 10 or cationic guar gum or untreated hair strands on shampoo. After the second wash, little smoke-induced protein degradation was observed. In addition, hair washed with shampoo containing APTAC/ACM also showed a dust-proof effect.
