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The conditioning performance of a formulation reflects the distribution of cationic conditioning polymers and agents such as silicone oils along the hair fiber. Thus, to deposit conditioners as well as fragrances, actives and other materials onto hair surfaces from cleansing and conditioning formulas, various deposition technologies have been developed.1 In cleansing formulations, the most broadly used deposition technology is based on the complex coacervate formed from a combination of cationic polymers and anionic surfactants. Alternatively, pearlized wax networks provide deposition in cleansing formulations.
In order to target the deposition of materials, innovative methods are required to assess the delivery of conditioning agents to the fiber surface and damaged ends. One such spectroscopic technique, generally used with flat film substrates, is called attenuated total reflectance-infrared spectroscopy (ATR-IR). ATR-IR has effectively been used to monitor the migration of low molecular weight silicone polymers through a silicone matrix.2 In the present study, ATR-IR is used to map silicone polymer depositions along the length of hair fibers from conditioning shampoo formulations. In addition, a combination of confocal laser scanning (CLS), fluorescent microscopy and atomic force microscopy (AFM) are used to define the corresponding distributions of cationic polymers along hair fiber surfaces.
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