- Pronunciation: \ ˌpä-lē-ˈvī-nᵊl \ ˈal-kə-ˌhȯl \
- Type: Synthetic
What Is Polyvinyl alcohol?
Polyvinyl alcohol is an odorless white or cream-colored powder or grainy substance.[1]
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What Does Polyvinyl alcohol Do in Our products?
Polyvinyl alcohol is a finishing agent used in household cleaning products. In food, it can be a glazing agent or thickener. It is also used as a lubricant to relieve dry or irritated eyes.[2] The ingredient can be found in makeup, face masks, moisturizer, and other personal care products; it can also be a barrier against CO2 in certain kinds of plastic bottles.[3,4] In laundry detergent it helps prevent dirt from getting back into fabrics during washing.[5] We use the ingredient in our dishwasher detergent powder because it dissolves in water, which facilitates the production of individual packets. It is not an active cleaning ingredient.
The company is the world’s best polyvinyl alcohol powder supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
Why Puracy Uses Polyvinyl alcohol
Polyvinyl alcohol mixes well with water, and studies show the ingredient is not a skin or eye irritant.[7,8,9] The FDA has deemed the ingredient safe to use in food contact surfaces.[10,11]
How Polyvinyl alcohol Is Made
Commercially, manufacturing polyvinyl alcohol occurs by dissolving polyvinyl acetate in some methanol or ethanol, along with a catalyst and heat. This separates the polyvinyl alcohol from the solution.[6]
If you want to learn more, please visit our website HPMC solubility chart.
Hi All,
I need help from you guys about PVA water solution. I did try to disolve PVA (Mw 89,000-98,000, 99+% hydrolyzed Poly(vinyl alcohol) powder from Sigma Aldrich), but I failed. I am describing the method I used, could you guys please point out what I did wrong?
Currently I heated a bottle with 10 ml water at 98 degree C and keep stir at 300 rpm, then I slowly add 1 gram of the above PVA powder into it. After keep heat and stir for 4 hours, I stop heat and stir. Then a few minutes later, white soft staff appeared at the bottom of the bottle. I tried to spin coat the solution on silicon, but I got very non-uniform film. I can see big grains (about 0.5 mm) composed of the film. After drying the film, the film becomes very fragile.
My objective is prepare less than 10 um thick uniform PVA film on silicon substrate. But right now I even couldn't get uniform PVA solution to start with. I am wondering if you can provide me some help on preparing PVA solution of ~ 10 wt%. Thank you very much.
Polymers that big can take days to actually go into solution. Remember it is a diffusion process and diffusion is proportional to mass (among other things).
Also, believe it or not, often with larger polymers rapid stiring actually slows down the process (not always).
Conversely, if you need a lot of agitation for something to go into solution, sonicating is often better.
My solution, stir it gently (but thoroughly) over the weekend and see what you get Monday.
Also, is water the best choice for thin films?
Thank you so much.
I will try your advices. I found on wiki and other papers that PVA is a water soluble polymer and good to dissolve in water. Also it seems that PVA water solution is extensively used in industry to produce thin films. If you have any other suggestions on the choices of solvents for PVA, please let me know.
Thank you.
Polymers that big can take days to actually go into solution. Remember it is a diffusion process and diffusion is proportional to mass (among other things).
Also, believe it or not, often with larger polymers rapid stiring actually slows down the process (not always).
Conversely, if you need a lot of agitation for something to go into solution, sonicating is often better.
My solution, stir it gently (but thoroughly) over the weekend and see what you get Monday.
Also, is water the best choice for thin films?
Polyvinyl alcohol dissolves well in water, but not much else. Be careful with your thin films, they will pull a lot of moisture out of the air and that will plasticize them, changing their mechanical properties. The plasticization may also cause the films to deform, causing wrinkling or dewetting from the wafer. Just keep an eye out for that.
As for making your solutions, molecular weights that high are going to take a long time to dissolve. You may also find that you can't make a 10 %wt solution of PVA that is that heavy. We usually don't use molecular weights like that at a concentration of more than a few %wt because the solutions get too viscous.
Follow the suggestion above of letting the solution stir for several days, gently, at room temperature and see what you get, it should work a lot better.