Freedom From Mental Slavery this is the dangerous chemicals in perms smh !!! Ammonium thioglycolate, also known as perm salt, is the chemical compound with the formula HSCH2CO2NH4. It finds extensive use in perm-ing hair. Being the salt of a weak acid and weak base, ammonium thioglycolic acid exists in solution as an equilibrium mixture of the salt itself as well as thioglycolic acid and ammonia: HSCH2COO− + NH4+ ⇌ HSCH2COOH + NH3 Thioglycolate, in turn, is able to scission disulfide bonds, capping one side with a hydrogen and forming a new disulfide with the other side: RSH + RSSR ⇌ RSH + RSSR The chemistry of perms[edit] A solution containing ammonium thioglycolate contains a lot of free ammonia, which swells hair, rendering it permeable. The thioglycolic acid in the perm solution reduces the disulfide cystine bonds in the cortex of the hair.[2] In a sense, the thioglycolate removes crosslinks. After washing, the hair is treated with a mild solution of hydrogen peroxide, which oxidizes the cysteines back to cystine. These new chemical bonds impart the structural rigidity necessary for a successful perm. The rigidification process is akin to the vulcanization of rubber, where commonly polysulfide linkages are used to crosslink the polymer chains. However, not as many disulfide bonds are reformed as there were before the permanent. As a result, the hair is weaker than before the permanent was applied and repeated applications over the same spot may eventually cause strand breakage. Since polar molecules are less volatile than nonpolar ones, the glycolate substituent makes the thiol non-volatile and hence less odorous. An added advantage is that the glycolate confers some solubility in water. One could almost certainly use HSCH3 and ammonia to give a perm, but there would be serious olfactory consequences. The dependency of African Women on Hair relaxers is truly worrisome especially as most women are not well informed about the chemicals present in these relaxers. Women relax their hair at least once every month and this ritual continues mostly for the rest of their lives. Being exposed to potentially harmful chemicals in small doses for a long period of time is whats absolutely scary. Hair companies do not print all the chemicals present in black hair products, if they did they’d probably go out of business. youtube/watch?v=4avPb_esHVo&feature=youtu.be reunionblackfamily/apps/blog/show/21531094-the-dependency-of-african-women-on-hair-relaxers-is-truly-worrisome — with Calvin X Jefferson.
Posted on: Fri, 02 Jan 2015 17:20:08 +0000
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