caa a22 4500 463228499 CHVBK 20180405153234.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1623-9 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1623-9 Ultrasound devulcanization: comparison of synthetic isoprene and natural rubbers [Elektronische Daten] [Ximei Sun, Avraam Isayev] Sulfur-cured vulcanizates of unfilled synthetic isoprene rubber (IR) were prepared and successfully devulcanized in a continuous co-axial ultrasonic reactor. Die pressure characteristics and ultrasonic power consumptions were measured. Network structures of the virgin vulcanizates, devulcanizates and revulcanizates were characterized by gel fraction and crosslink density according to the classic swelling method. The molecular characteristics of the sol generated by ultrasound treatment were determined by GPC. Kinetics of revulcanization, rheological properties of the devulcanizates and mechanical properties of the revulcanizates were compared with those of virgin uncured IR and their vulcanizates. In addition, a comparison of the cure behavior, devulcanization characteristics, network structures and the mechanical properties was made between IR and the natural rubber (NR) reported earlier. Simulations on the correlation of the normalized gel fraction and the normalized crosslink density show that these two rubbers have almost equivalent probability of main chain scission and crosslink rupture ratio, which is probably determined by the main chain structure of both rubbers consisting of cis-1,4-isoprene. Springer Science+Business Media, LLC, 2007 Sun Ximei Institute of Polymer Engineering, The University of Akron, 44325-0301, Akron, OH, USA aut Isayev Avraam Institute of Polymer Engineering, The University of Akron, 44325-0301, Akron, OH, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7520-7529 0022-2461 42:17<7520 2007 42 10853 https://doi.org/10.1007/s10853-007-1623-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1623-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sun Ximei Institute of Polymer Engineering, The University of Akron, 44325-0301, Akron, OH, USA aut NATIONALLICENCE 700 1- Isayev Avraam Institute of Polymer Engineering, The University of Akron, 44325-0301, Akron, OH, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7520-7529 0022-2461 42:17<7520 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer