Polyacrylamide Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R45:Kann Krebs erzeugen.
R21/22:Gesundheitsschädlich bei Berührung mit der Haut und beim Verschlucken.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R42/43:Sensibilisierung durch Einatmen und Hautkontakt möglich.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S53:Exposition vermeiden - vor Gebrauch besondere Anweisungen einholen.
Chemische Eigenschaften
white to faintly yellow granules
Verwenden
Polyacrylamide is a polymer formed from acrylamide subunits. Polyacrylamide has been extensively used in applications such as polyacrylamide gel electrophoresis.
synthetische
Polyacrylamide resembles poly(acrylic acid) and poly(methacrylic acid)
in being water-soluble and, as with those polymers, it is mainly
this property which results in some limited commercial utilization.
Polyacrylamide is prepared by free radical polymerization, using techniques essentially similar to those described for poly(acrylic acid) and poly(methacrylic acid):
It may be noted that whereas this reaction gives a vinyl polymer, a different
type of polymer is obtained when polymerization is initiated by a strong base.
In this case, a polyamide (nylon 3) is formed. Active initiators for this type of
polymerization include alkoxides (RO-) and reaction probably takes place
according to the following scheme, which involves the rearrangement of a
carbanion to a more stable amide anion:
Polyacrylamide is a hard, brittle material. It is readily soluble in cold water
but solubility in organic compounds is generally very limited. The polymer
undergoes reactions characteristic of the amide group; for example, alkaline
hydrolysis introduces carboxylic groups and reaction with formaldehyde
gives methylol groups.
Polyacrylamide has found use as a ftocculant in the processing of minerals
and in water treatment. Copolymers of acrylamide and acrylic acid are used
to increase the dry strength of paper.
Definition
polyacrylamide: A polymerformed from 2-propenamide(CH
2:CHCONH
2). Polyacrylamide gelsare made using a cross-linking agentto form three-dimensional matrices.They are used in gel electrophoresis.
Allgemeine Beschreibung
Intelligent Swelling/Collapsing copolymer that can be used as a temperature- and pH-sensitive material.
Polyacrylamide Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
