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How cationic and non cationic polymers deposit on hair From Shampoo and cause buildup?
Suppose there is a Shampoo with 0.3% guar Hydroxypropyltrimonium Chloride as conditioner and 0.5% non-ionic guar gum or xanthan gum as thickener. How does this cationic guar gum deposit on hair from applying this shampoo?
It has positive charge and it attaches to negative charge of hair and remains there.
1. If so then what happens to other cationic guar molecules when all negative charges of hai has attached to some cationic guar and there is no more free negative charge?2. Will more molecules of cationic guar set on top of each other without ionic attachment and cause buildup or they don’t bind/stay in hair?
3. If they set on top of each other without ionic attachment then will other polymers(xanthan gum and non-ionic guar gum) also stay on hair this way and cause buildup?
If not why not?4. If they dont stay on hair then how do they cause buildup in long term?
It deposit in hair via dilution/deposition method.
5. Then will non-ionic guar gum and xanthan gum also deposit in hair by this method?
If not then why not? -
3 Replies
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@Perry @Pharma @chemicalmatt @PhilGeis any thoughts
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Cationic polymers deposit on hair in two ways.
1. Through electrostatic interaction (as you said)
2. But also through a dilution/deposition method.The second mechanism works like this. In a shampoo, there is enough surfactant to keep the cationic polymer in solution. But when it is put on hair and mixed with water, the surfactant level falls below that which is required to keep the polymer in solution. This causes it to come out of solution and deposit on the hair. Thus dilution/deposition.
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@Perry thanks ????
Some more questions.1. Does polymers like guar Hydroxypropyltrimonium Chloride need surfactant to be solubilized in water?
2. when shampoo is put on hair and mixed with water, does only cationic polymers deposit on hair or others like xanthan gum and regular guar gum also deposit on hair from this mechanism?
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