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Hair is straightened to improve manageability and provide style versatility. To straighten hair, an alteration of the cortex must occur. To achieve temporary straightening – a lower energy process – hydrogen bonds and salt linkages are altered while permanent straightening is achieved through the modification of covalent bonds, which requires more energy. Permanent hair straightening can be accomplished...
Abstract. Deuterium NMR and modulated differential scanning calorimetry (MDSC) were used to probe the behavior of ultrathin adsorbed poly(methyl acrylate) (PMA). The spectra for the bulk methyl-labeled PMA-d3 were consistent with the motions of the polymer segments being spatially homogeneous. For the polymers adsorbed on silica, multicomponent line shapes were observed. The segmental mobility of...
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