While sodium neutralized polyacrylic acids are the most common form used in industry, there are also other salts available including potassium, lithium and ammonium.
12.
As MTA is mainly composed of calcium-alumino-silicate, PAA ( polyacrylic acid ) is an accelerant for MTA . PAA set MTA within 15 18 minutes.
13.
Polyacrylic acid _ a polymer made of up of long, branching chains of molecules _ is normally used in moderate quantities for its gel-forming properties.
14.
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.
15.
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.
16.
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.
17.
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 ).
18.
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.
19.
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 ).
20.
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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