General Data

Structure of the polymer:

Properties of different PDADMAC types that are suitable for
preparation of hollow beads with the poly anion SEC:

Magnafloc 368:
- mean molecular weight 60,800 g/mol
- weigthed molecular weigth 357,300 g/mol
- solid white salt, 91.8 %

Praestol 187 K:
- mean molecular weight 34,500 g/mol
- weigthed molecular weigth 112,900 g/mol
- aqueous solution, 40.4 %

Economy

PDADMAC is produced in large scale e.g. for waste water treatment.
suppliers:

for Magnafloc 368: Allied Colloids GmbH, Hamburg, Germany
for Praestol 187 K: Stockhausen GmbH & Co. KG, Krefeld, Germany

Mechanical Properties

Described for hollow beads prepared of PDADMAC and Sulfoethyl cellulose (SEC). Please have a look at related page.

Encapsulation Mechanism

Hollow beads with good mechanical stability on basis of polyelectrolyte-polyelectrolyte-complexes (symplexes) could be formed with Sulfoethyl cellulose (SEC) as a polyanion.

Encapsulation Procedure

Described for hollow beads prepared of PDADMAC and Sulfoethyl cellulose (SEC). Please have a look at related page.

Biocompatibility

SEC capsules and hollow beads were tested for encapsulation of the fungus Hirsutella rhossiliensis for biological pest control of nematodes. The encapsulation did no harm to the fungus.

Shape

In combination with a poly anion, e.g. Sulfoethyl cellulose (SEC), hollow beads of 0.15 to 5 mm can be prepared by dripping techniques.

Modifications

(no entry yet)

Applications
Hollow beads on basis of the poly anion Sulfoethyl cellulose (SEC) for encapsulation of a nematophagous fungus for use in biocontrol.

Information can be found in an internetpresentation of the Institute of Technology of the Federal Agricultural Research Centre (FAL).

Other Possible applications:
Microencapsulation of bioactive materials like cells, bacteria, enzymes, etc. under moderate conditions for use in biotechnology or environmental technology.

Legal Status

Allowance in waste water treatment.

Literature

Dautzenberg, H., Jaeger, W., Kötz, J., Philipp, B., Seidel, Ch., and Stscherbina, D.
Polyelectrolytes - Formation, Characterization and Application
Carl Hanser Verlag, Munich, 1994
Chapter 2, p. 11-84, Chapter 7, p. 272-320

Wandrey, C., Hernández-Barajas, J., and Hunkeler, D. (1999).
Diallyldimethylammonium Chloride and its Polymers
Advances in Polymer Science, 145, 123-182

Rose, T., Neumann, B., Thielking, H., Koch, W., and Vorlop, K.-D. (2000).
Hollow beads of Sulfoethylcellulose (SEC) on basis of polyelectrolyte complexes.
Chemical Engineering & Technology (in press)

Contacts and Links

for hollow beads of PDADMAC and SEC:

Thomas Rose, Klaus-D. Vorlop
Institute of Technology
Federal Agricultural Research Centre (FAL)
Bundesallee 50, D - 38116 Braunschweig, Germany
Phone: + 49 531 - 596 511
Fax : + 49 531 - 596 363
e-mail: tec@fal.de