The Effects of Molecular Architecture on the Rheological and Mechanical Properties of Polymeric Systems
Sendijarevic, Ibrahim
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https://hdl.handle.net/2142/82346
Description
Title
The Effects of Molecular Architecture on the Rheological and Mechanical Properties of Polymeric Systems
Author(s)
Sendijarevic, Ibrahim
Issue Date
2002
Doctoral Committee Chair(s)
McHugh, Anthony J.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
The roles of molecular architecture and end-group functionality on the surface segregation characteristics of branched polymers in blends with commercially available linear polymers were also investigated. In the blends of branched PEIs with polystyrene (PS), the surface migration of PEIs correlates with the changes in their molecular architecture with xAB. However, the effects of configurational entropy, which depends on the molecular architecture, on the surface migration properties of blends are minute in comparison to the enthalpic effects, which are affected by the end-group chemistry of HBPs. Therefore, in order to minimize the interfacial energy, it was observed that the PEI HBPs with lower surface energies than PS segregated to the low energy air-interface, in turn decreasing the surface energy of PS films. On the other hand, higher surface energy PEI HBPs concentrate near the substrate, inhibiting the dewetting of low molecular weight PS. The miscibility of HBPs with linear low density polyethylenes (LLDPE) was found to depend on the length and concentration of alkane end-groups on HBPs. However, the addition of small amounts of PEI HBPs to LLDPEs was found to have a negligible effect on the rheological and processing properties of LLDPEs.
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