Studies of network organization and dynamics of e-beam crosslinked PVPs: From macro to nano |
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| Authors: | C. Dispenza N. Grimaldi M.-A. Sabatino S. Todaro D. Bulone D. Giacomazza G. Przybytniak S. Alessi G. Spadaro |
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| Affiliation: | 1. Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanica, Università degli Studi di Palermo, Viale delle Scienze Ed. 6, 90128 Palermo, Italy;2. CNR – Istituto di Biofisica (Palermo unit), Via U. La Malfa 153, 90146 Palermo, Italy;3. Centre for Radiation Research and Technology, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland;1. Institute of Strength Physics and Materials Science SB RAS, 2/4 Akademichesky Ave., Tomsk 634021, Russia;2. National Research Tomsk State University, 36 Lenin Ave., Tomsk 634036, Russia;3. National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk 634036, Russia;1. College of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116024, China;1. Accelerators & Ion Sources Dept., Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;2. Central Lab. for Elemental & Isotopic Analysis, Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;1. Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;2. National Nano Device Laboratories, National Applied Research Laboratories, 741, Taiwan;1. Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212013, China;1. Laboratoire de Sciences des Matériaux, ECAM Lyon, 40 Montée Saint Barthélemy, Université de Lyon, 69 321 Lyon Cedex, France;2. LaBoMaP, Arts & Métiers ParisTech, Centre de Cluny, Rue porte de Paris, 71 250 Cluny, France;3. Department of Production Engineering, Faculty of Mechanical Engineering, Technical University of Lodz, Poland |
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| Abstract: | In this work the influence of poly(N-vinyl pyrrolidone) (PVP) concentration in water on the organization and dynamics of the corresponding macro-/nanogel networks has been systematically investigated. Irradiation has been performed at the same irradiation dose (within the sterilization dose range) and dose rate. In the selected irradiation conditions, the transition between macroscopic gelation and micro-/nanogels formation is observed just below the critical overlap concentration (～1 wt%), whereas the net prevalence of intra-molecular over inter-molecular crosslinking occurs at a lower polymer concentration (below 0.25 wt%). Dynamic–mechanical spectroscopy has been applied as a classical methodology to estimate the network mesh size for macrogels in their swollen state, while 13C NMR spin–lattice relaxation spectroscopy has been applied on both the macrogel and nanogel freeze dried residues to withdraw interesting information of the network spatial organization in the passage of scale from macro to nano. |
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