polyacrylic acid वाक्य
उदाहरण वाक्य
मोबाइल
- By contrast, polyacrylic acid displays UCST behavior solely at high ionic strength.
- The new gel contains roughly four times as much polyacrylic acid as normal vaginal products.
- The researchers discovered that polyacrylic acid, a common ingredient in vaginal products, was an ideal buffer.
- Most cytotoxicity is caused by polyacrylic acid.
- Polyacrylic acid appears to do this without harming the vaginal lining or inactivating beneficial bacteria, according to Moench.
- Chemically, it is a synthetic polymer of polyacrylic acid cross-linked with divinyl glycol, with calcium as a counter-ion.
- It's made from the same cross-linked polyacrylic acids that fill diapers : long, netlike molecules that unfurl in the presence of water.
- A graft-and-block approach might be useful for solving problems encountered by the use of a common bioadhesive polymer, polyacrylic acid ( PAAc ).
- For polar systems such as polyacrylic acid in 1, 4-dioxane, this is often due to the formation of hydrogen bonds between polymer and solvent.
- A different representation : polyacrylic acid residues are shown in red, residues of the cross-linker divinyl glycol ( 3, 4-dihydroxy-1, 5-hexadiene ) in blue.
- While sodium neutralized polyacrylic acids are the most common form used in industry, there are also other salts available including potassium, lithium and ammonium.
- As MTA is mainly composed of calcium-alumino-silicate, PAA ( polyacrylic acid ) is an accelerant for MTA . PAA set MTA within 15 18 minutes.
- Polyacrylic acid _ a polymer made of up of long, branching chains of molecules _ is normally used in moderate quantities for its gel-forming properties.
- The substance is a polymer in powder form ( a polyacrylic acid derivative ) which reportedly has the ability to absorb 1, 500 times its own weight in water.
- As the pH of the aqueous solution rises, the polyacrylic acid begins to ionise, and becoming negatively charged it sets up a diffusion gradient and helps draw cations out of the glass and dentine.
- Polyacrylic acid is a weak anionic polyelectrolyte, whose degree of ionisation is dependent on solution pH . In its non-ionised form at low pHs, PAA may associate with various non-ionic polymers ( such as polyethylene oxide, poly-N-vinyl pyrrolidone, polyacrylamide and some cellulose ethers ) and form hydrogen-bonded interpolymer complexes.
- Lattuada " et al . " prepared nanoparticles with one side coated with a pH-responsive polymer ( polyacrylic acid, PAA ) and the other with either a positively charged polymer ( poly dimethylamino ethyl methacrylate, PDMAEMA ), a negatively charged, pH-insensitive polymer, or a temperature-responsive polymer ( poly N-isopropyl acrylamide, PNIPAm ).
- There are two kinds of pH sensitive materials : one which have acidic group (-COOH,-SO 3 H ) and swell in basic pH, and others which have basic groups (-NH 2 ) and swell in acidic pH . Polyacrylic acid is an example of the former and Chitosan is an example of the latter.
- Examples for water systems are : chelating agents ( for example, EDTA ), long-chain aliphatic amines or polyamines ( for example, octadecylamine, helamin, and other " film-forming " amines ), organic phosphonic acids ( for example, etidronic acid ), or polyelectrolytes ( for example, polyacrylic acid, polymethacrylic acid, usually with a molecular weight lower than 10000 ).
- Acrylic acid and its esters readily combine with themselves ( to form polyacrylic acid ) or other monomers ( e . g . acrylamides, acrylonitrile, vinyl, styrene, and butadiene ) by reacting at their double bond, forming homopolymers or copolymers which are used in the manufacture of various plastics, coatings, adhesives, elastomers, as well as floor polishes, and paints.
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