Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session B51: Advanced Scattering Techniques to Inform the Design of Polymeric SystemsInvited
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Sponsoring Units: DPOLY Chair: Gila Stein, Univ of Tennessee, Knoxville Room: BCEC 253A |
Monday, March 4, 2019 11:15AM - 11:51AM |
B51.00001: Exploiting the process of thin film printing for structure manipulation tracked by grazing incidence scattering Invited Speaker: Eva M. Herzig Thin films can have intriguing properties that are exploitable for consumer good applications. Such properties are strongly linked to the morphology on the nanoscale within such thin films. X-ray scattering can be a very powerful tool to resolve such structures, and also, to carry out time-resolved measurements to track the actual formation of the final nanostructures. |
Monday, March 4, 2019 11:51AM - 12:27PM |
B51.00002: Packaging Plastics - Structure-Property Relationships Invited Speaker: David G Bucknall The use of various experimental methods have been widely employed to study polymer deformation. Despite these previous studies, there still remains a disconnect between the molecular architecture, i.e. branch content, molecular weight between branches, etc, and the macroscopic mechanical properties. The nature of the uniaxial deformation behavior of polymers can be explained using continuum models, a surprisingly simple yet effective example of which is the spring and dashpot model of Haward and Thackray. Such models try and interpret the observed behavior in terms of viscous and elastic components associated with the crystalline and amorphous phases within the semi-crystalline polymer regions. However, these continuum models only provide a very indirect correlation between the observed mechanical behavior and the molecular structure. In this talk, the use of in-situ X-ray scattering experiments will be discussed which have enabled development of a more complete molecular interpretation of the deformation processes in polyolefins and polyesters. These results have allowed us to make direct correlations between the molecular architecture and the mechanical properties. |
Monday, March 4, 2019 12:27PM - 1:03PM |
B51.00003: Correlating Thermodynamic Assembly to Functional and Structural Performance of Polymeric Systems by Comprehensive Analysis of Neutron Scattering Invited Speaker: Mark Dadmun Small angle scattering is often used to determine the size and shape of polymeric materials, but more thorough analysis of the scattering from multi-component polymer systems provides interfacial surface area, average domain size, and importantly, phase composition. For instance, polyimide aerogels (PIA) saturated with ionic liquids are promising materials as robust electrolytes for next generation batteries. Careful analysis of SANS data from PIA/ionic liquid constructs show that the ionic liquid penetrates the polyimide skeleton. This unexpected structure clearly impacts charge transport and therefore performance of the aerogel as a battery component. This mixing behavior must be more fully understood to rationally utilize these promising materials in devices. We will also present examples of how similar analyses of scattering data provide crucial insight into the correlation of thermodynamic structure and performance in energy harvesting nanocomposites, the relationship between structure and dynamics in all-polymer nanocomposites, and the impact of deposition conditions on the lateral and vertical phase separation in polymer blend thin films. |
Monday, March 4, 2019 1:03PM - 1:39PM |
B51.00004: Interfacial structure and dynamics in nanoparticle-polymer composites Invited Speaker: Rana Ashkar Nanoparticle-polymer hybrids and composites are central to a wide range of advanced multifunctional materials and technological applications. The premise of such systems lies in the myriad of possibilities that they offer in synergistically integrating particle and polymer properties to obtain significantly improved material performance. The past few decades of research on nanoparticle-based materials have remarkably enhanced our understanding of their macroscopic behavior and have resulted in an array of novel technologies. Yet, the demand for increasingly sophisticated applications of nanoparticle-polymer composites requires design rules that allow control of nanoscale interactions between the nanoparticles and their host environment. Such interactions manifest in unique interfacial structural and dynamical properties which ultimately determine the emergent material behavior. In this talk, I highlight the role of neutron scattering in directly observing and resolving interfacial properties that are critical to the design and performance of nanoparticle-polymer hybrids and composites. |
Monday, March 4, 2019 1:39PM - 2:15PM |
B51.00005: Polymer electrolytes for battery technology Invited Speaker: Janna Maranas Polymer electrolytes have potential for use in next generation lithium and sodium batteries. Replacing the liquid electrolyte currently used has several advantages: it allows use of high energy density solid lithium as the anode, removes toxic solvents, improves safety, and eliminates the need for heavy casings. Despite their advantages, the conductivity of polymer electrolytes is not sufficient for use in batteries. As a result, considerable effort towards improving conductivity and understanding mechanisms of lithium transport has taken place over the last 30 years. This talk considers the interplay of conductivity, crystallinity, local coordination and polymer dynamics in solid polymer electrolytes. Using a combination of experimental and computational technique, we propose the possibility of high charge mobility using ion aggregates and percolated nanofiller networks. |
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