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Georgia Tech

1. Nam, Sunghyun. Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends.

Degree: PhD, Textile and Fiber Engineering, 2006, Georgia Tech

Chemically identical but topologically different cyclic and linear polymers not only result in marked differences in dynamics, but also lead to unique transport properties of their blends, where cyclic polymers have chances to be threaded onto the linear polymers. This dissertation addresses the effect of ring architecture on dynamics using different time/length scale techniques: self-diffusion coefficients, NMR spin-spin relaxation time (T2) and bulk viscosity. In deuterated water, synthesized cyclic poly(oxyethylene) (CPOE) (400-1500 g/mol) diffused faster than corresponding linear POE (LPOE) and linear POE dimethyl ether (LPOEDE). However, the self-diffusion coefficients in melts were arranged in the following manner: LPOEDE > CPOE > LPOE, in excellent agreement with T2 and viscosity data, showing topological and chain end effects. Compared to LPOEDE, both CPOE and LPOE had higher activation energies for viscosity with less dependence on the molecular weight. In the blends of CPOE and LPOE for 900 and 1500 g/mol, the diffusion coefficient and viscosity in melts were higher and lower than the values predicted by a binary mixing rule, respectively. These deviations were attributed to the threading conformation, and the weight fraction of the threaded chains for 1500 g/mol was estimated by a three-term mixing rule. This threading conformation also appeared to influence such important bulk properties as the glass transition and spherulitic growth rate of the blends. Advisors/Committee Members: Dr. Haskell W. Beckham (Committee Chair), Dr. David G. Bucknall (Committee Member), Dr. Johannes Leisen (Committee Member), Dr. Rigoberto Hernandez (Committee Member), Dr. Victor Breedveld (Committee Member).

Subjects/Keywords: Spherulitic growth rate of cyclic polymer; Blends of cyclic and linear polymers; Topological effect on the dynamics; Self-diffusion coefficient; Diffusion of threaded chains; Polymers Testing; Polymers Viscosity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nam, S. (2006). Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14135

Chicago Manual of Style (16th Edition):

Nam, Sunghyun. “Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends.” 2006. Doctoral Dissertation, Georgia Tech. Accessed April 16, 2021. http://hdl.handle.net/1853/14135.

MLA Handbook (7th Edition):

Nam, Sunghyun. “Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends.” 2006. Web. 16 Apr 2021.

Vancouver:

Nam S. Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1853/14135.

Council of Science Editors:

Nam S. Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/14135

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