caa a22 4500 467886555 CHVBK 20180406152736.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s10924-006-0002-y doi (NATIONALLICENCE)springer-10.1007/s10924-006-0002-y Reactive Extrusion of Starch-Polyacrylamide Graft Copolymers Using Various Starches [Elektronische Daten] [J. Willett, V. Finkenstadt] Graft copolymers of polyacrylamide and various substrates were prepared by reactive extrusion in a twin screw extruder using ammonium persulfate as initiator. Substrates included unmodified starches (corn, waxy maize, wheat, and potato), cationic starches, dextrin, dextran, and polyvinyl alcohol (PVOH). The feed ratio of substrate to monomer was 2:1. Average conversion of monomer to polymer was 88.9% (±5.1%). Graft contents for the starch substrates were approximately 25% with grafting efficiencies of about 70%. Polyacrylamide graft molecular weights ranged from 317,000 to 769,000. Absorbencies at pH7 for saponified graft copolymers prepared with unmodified starches were approximately 200g/g and approximately 150g/g for the cationic starches, dextran, and PVOH. In electrolyte solution (0.9% NaCl), absorbencies were in the range of 26-59g/g, depending on substrate type. Saponified dextrin copolymers were essentially soluble with absorbencies of 6g/g in water and 12g/g in 0.9% NaCl. Springer Science+Business Media, Inc., 2006 Starch nationallicence Graft copolymer nationallicence Reactive extrusion nationallicence Polyacrylamide nationallicence Willett J. Plant Polymer Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, 61604, Peoria, IL, USA aut Finkenstadt V. Plant Polymer Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, 61604, Peoria, IL, USA aut Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/2(2006-06-01), 125-129 1566-2543 14:2<125 2006 14 10924 https://doi.org/10.1007/s10924-006-0002-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10924-006-0002-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Willett J. Plant Polymer Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, 61604, Peoria, IL, USA aut NATIONALLICENCE 700 1- Finkenstadt V. Plant Polymer Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, 61604, Peoria, IL, USA aut NATIONALLICENCE 773 0- Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/2(2006-06-01), 125-129 1566-2543 14:2<125 2006 14 10924 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer