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oai:www.ideals.illinois.edu:2142/67232 2023-07-11 col_2142_5131 col_2142_14789 com_2142_5130 com_2142_14788 com_2142_8903

Munie, Gregory Charles 2014-12-13T20:10:57Z 2014-12-13T20:10:57Z 10000-01-01 1980 1980 Proton relaxation measurements have been used to investigate the effects of crosslinking and entanglements on segmental motion in polybutadiene. The temperature dependence of T(,1), the spin-lattice relaxation time, T(,2), the spin-spin relaxation time, and T(,1(,(rho))), the spin-lattice relaxation time in the rotating frame are reported for samples of well characterized crosslink density. These relaxation parameters are reported as a function of both temperature and pressure for uncrosslinked samples of narrow molecular weight distribution. The relaxation data are interpreted in terms of the effects of crosslinks and entanglements on segmental motion. Well characterized, lightly crosslinked networks of the narrow molecular weight distributed samples have been prepared in both the bulk and dilute states. The temperature dependence of T(,1), T(,2), and T(,1(,(rho))) for these networks is reported. The values of the Mooney-Rivilin constants, 2C(,1), and 2C(,2), for these networks have also been measured. The NMR and bulk property measurements are interpreted in terms of the effects of the sol fraction and entanglements on chain motion. Made available in DSpace on 2014-12-13T20:10:57Z (GMT). No. of bitstreams: 1 8026563.pdf: 4933248 bytes, checksum: 1ea4500be1a31974fbfb2ca7b2c4ba70 (MD5) Previous issue date: 1980 Embargo set by: Seth Robbins for item 67410 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 171 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980. http://hdl.handle.net/2142/67232 (UMI)AAI8026563 eng Chemistry, Polymer Crosslinking and Entanglement Effects in Polybutadiene text Chemistry Chemistry University of Illinois at Urbana-Champaign Dissertation Ph.D.