Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session A21: Polymer Physics - From Academia to Industry and BackIndustry Invited
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Sponsoring Units: DPOLY FIAP Chair: Rohan Hule, ExxonMobile, Inc Room: 281-282 |
Monday, March 13, 2017 8:00AM - 8:36AM |
A21.00001: Engineering Field-Responsive Soft Materials for Protecting First Responders, Athletes and Astronauts Invited Speaker: Norman Wagner I will show how we are using novel field-responsive polymeric materials as nanocomposites for enhanced ballistic and impact protection, puncture resistant medical gloves, energy absorbing materials for mitigating impacts and concussions, as well as in systems for mitigating micrometeoroid and orbital debris threats in space applications. New mechano-chemical force-responsive polymers will find use as self-healing protective materials. Hierarchically self-assembled block copolymers in ionic liquids form ions-elastomers with unique mechano-electrical response for use in flexible electronics and sensors. Illustrations of technological applications under commercial development will be discussed, including use in astronaut protection and possible application in the manned mission to Mars. [Preview Abstract] |
Monday, March 13, 2017 8:36AM - 9:12AM |
A21.00002: Comb Block Polyolefins Invited Speaker: Patrick Brant Examples of crystallizable comb block polyolefins seem to be rare in spite of the significant opportunity they pose to explore structure-property relationships of new block topologies accessible by this route. In this talk we will focus on a new strategy for making comb block polyolefins. We will illustrate the approach using esterification of commercial ethylene acrylic acid copolymer (EAA such as Escor\texttrademark 5100; a high pressure, free radical initiated product) with three atactic polypropylenehydroxide macromonomers (aPPOH; M$_{\mathrm{n}}$ 1, 3, and 7k). The quantity of aPPOH in the products ranges from 13 to 60 wt{\%}. These pure products and selected blends containing them have been characterized. Findings from these experiments will be shared. . [Preview Abstract] |
Monday, March 13, 2017 9:12AM - 9:48AM |
A21.00003: Understanding Melt-Memory of Commercial Polyolefins Invited Speaker: Rufina Alamo Self-nucleation (SN) or controlling self-generated seeds in a polymer melt is an avenue to increase the rate of solidification of semicrystalline polymers of commercial relevance. Self-nuclei are remains in the melt of the segmental self-assembly to form polymer crystallites providing a path to enhance primary crystal nucleation. SN has been extensively studied in homopolymers such as iPP. Recently, a strong memory effect of crystallization has been observed in melts of random ethylene copolymers well above the equilibrium melting temperature. The melt memory is associated with clusters or seeds that remain in the melt from the copolymer's sequence length partitioning. Cooling from progressively lower self-seeded melt temperatures, ethylene copolymers with a broad inter-chain comonomer composition (1 -- 15 mol{\%}) display first the expected accelerated crystallization, followed by a decrease in the rate in a range of melt temperatures where narrow copolymers show a continuous acceleration of the rate. This unusual inversion of the crystallization rate was postulated to arise from the onset of liquid-liquid phase separation (LLPS) between comonomer-rich and comonomer-poor components of the broad copolymer. The UCST type phase diagram of these commercial copolymers has been documented via SANS using a blend of components, some deuterated, to reproduce the broad distribution. Furthermore, the components that contribute to LLPS have been identified by the crystallization behavior of molar mass fractions. The influence of long chain branching on the topology of copolymer melts has been analyzed using model 3-arm stars hydrogenated polybutadienes. The effect of melt viscosity on strength of melt memory is also evident when SN data of random ethylene copolymers are compared with those of propylene-ethylene copolymers. The strong dependence of melt viscosity on melt memory, and a critical threshold crystallinity level to observe the effect of melt memory on crystallization rate, support the kinetic nature of the SN phenomenon. [Preview Abstract] |
Monday, March 13, 2017 9:48AM - 10:24AM |
A21.00004: Applications of Polymer Nanocomposites Invited Speaker: Jeffrey Meth Polymer nanocomposites have been developed for application in several areas. This talk will provide three vignettes of applications that have been explored. Nanoporous ceramics are free standing ceramic objects that can be used for filtration. The pore size distribution is in the proper target range for filtering viruses from medicines in solution. Filled polyimides are useful for improving the ultimate electrical properties of insulating films during corona exposure. The advantages and pitfalls of this approach will be detailed. Exfoliated laponite dispersed into ethylene copolymers reduces creep while maintaining transparency, which is applicable to packaging. [Preview Abstract] |
Monday, March 13, 2017 10:24AM - 11:00AM |
A21.00005: Block copolymer self-assembly derived ultrafiltration membranes: From science to start-up. Invited Speaker: Ulrich Wiesner In the last ten years a novel method to generate asymmetric ultrafiltration membranes has been established. It is based on the combination of block copolymer self-assembly with non-solvent induced phase separation (NIPS) and is now referred to as SNIPS. NIPS as an industry proven method for the formation of phase inversion membranes opening a pathway to scale up and commercialization of these membranes. The combination of NIPS with block copolymer self-assembly leads to asymmetric membranes with narrow pore size distributions in the top surface layer (so called isoporous membranes) as well as high pore densities, thereby potentially combining high resolution with high flux in membrane separation processes. Such membranes have potential applications in the biopharmaceutical industry where a large fraction of the costs are currently associated with time-consuming non-membrane based separation processes. This talk will describe a family of isoporous ultrafiltration membranes based on the self-assembly behavior of an ABC triblock terpolymer which has led to the formation of a start-up company out of Cornell University. After introduction of the SNIPS process in general, and its application to such ABC triblock terpolymers in particular, open scientific questions associated with the formation mechanisms of the top surface separation layer in such membranes is discussed, which is at the heart of enabling high performance separation behavior. Furthermore, challenges translating scientific work into industrial settings are highlighted. [Preview Abstract] |
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