What does this chart about polymer deposition mean?

This chart is about deposition of polymers. But i couldn't get the idea that what does it mean. 

can you explain what does this chart means and what is it showing?

Comments

  • chemicalmattchemicalmatt Member, Professional Chemist
    Your confusion is warranted. If the x-axis values are %Transmission @ 600nm (yellow-red part of spectrum) how did the analyst gain a transmission HIGHER than 100% with their cationic polymer? Impossible.  Other than that absurdity, it shows their Polyquat-74 flocced nearly out of solution at a 2:1 dilution-deposition ratio with water while at a 4:1 ratio Polyqaut-10 (my personal fave) deposited onto substrate better than theirs and guarHPTC deposited even better at a 6:1 dilution-deposition. My conclusion: try not  to spend too much time under the shower head when rinsing  that 2-in-1 conditioning shampoo off your hair.
  • @chemicalmatt thanks for explaining

    This dilution ratio for example 4, means 4 parts water one part shampoo or 3 parts water one part shampoo that Totals 4 parts?


  • It can also be mentioned that both PQ-74 and Cationic guar deposit higher amounts of polymer than PQ-10 (although, the initial transmitance for Cationic guar was 80, so it was a bit more turbid from the start than the other two). 

    Both curves (from PQ-10 and Cationic guar are broader) than the one from PQ-74, which might mean that they have a range of flocculation rather than a sharp peak.

    Also, in this system, PQ-7 doesn't seem to form coacervates (which is actually no surprising).

    Now, it should be understood that the behavior from those graphics depends on the system tested (I'd expect something different if we increase for instance, the amount of Betaine relative to the amount of SLES, or if the secondary surfactant is substituted by a different one). 
  • @ketchito what do you think x-axis is in this chart? 
    And in y-axis does 2 mean two parts water one part product or one part water one part product that becomes two parts? 
  • @Abdullah The vertical axis as @chemicalmatt mentioned, should be Transmittance. In the horizontal axis, the numbers indicate the parts of water per 1 part of your base shampoo (that's the dilution factor).
  • @ketchito thanks 

    Any comments on when this dilution deposition is happening?

    When we apply shampoo to wet hair and shampoo is diluted with water or when we are rinsing the foam from hair? 

    Because when we are applying shampoo to wet hair it dilutes with around 10 times water there to create lather. 
  • @Abdullah It happens when you apply the shampoo to hair following by water. By the time you are rinsing, dilution is way too high (but it doesn't matter, becaue whatever had to deposit already did). 
  • ketchito said:
    @Abdullah It happens when you apply the shampoo to hair following by water. By the time you are rinsing, dilution is way too high (but it doesn't matter, becaue whatever had to deposit already did). 
    Thanks for explaining
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