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Division of Polymer Chemistry (POLY) Graphical Abstracts Submitted for the 258th ACS National Meeting & Exposition August 25 - 29, 2019 | San Diego, CA Table of Contents [click on a session time (AM/PM/EVE) for link to abstracts] Session SUN MON TUE WED THU AM AM Polymerization-Induced Nanostructural Transitions PM PM Paul Flory's "Statistical Mechanics of Chain Molecules: The 50th AM AM Anniversary of Polymer Chemistry" PM PM AM AM AM Eco-Friendly Polymerization PM PM EVE AM Characterization of Plastics in Aquatic Environments PM PM AM General Topics: New Synthesis & Characterization of Polymers AM PM AM PM EVE Future of Biomacromolecules at a Crossroads of Polymer Science & AM AM EVE Biology PM PM Industrial Innovations in Polymer Science PM AM AM Polymers for Defense Applications PM AM PM EVE Henkel Outstanding Graduate Research in Polymer Chemistry in AM Honor of Jovan Kamcev AM AM Polymeric Materials for Water Purification PM AM PM EVE Young Industrial Polymer Scientist Award in Honor of Jason Roland AM Biomacromolecules/Macromolecules Young Investigator Award PM Herman F. Mark Award in Honor of Nicholas Peppas AM DSM Graduate Student Award AM Overberger International Prize in Honor of Kenneth Wagner PM Note: ACS does not own copyrights to the individual abstracts. For permission, please contact the author(s) of the abstract. POLY 1: High throughput and solution phase TEM for discovery of new pisa reaction manifolds Nathan C. Gianneschi1, [email protected], Mollie A. Touve1, Adrian Figg1, Daniel Wright1, Chiwoo Park2, Joshua Cantlon3, Brent S. Sumerlin4. (1) Chemistry, Northwestern University, Evanston, Illinois, United States (2) Florida State University, Tallahassee, Florida, United States (3) SCIENION, San Francisco, California, United States (4) Department of Chemistry, University of Florida, Gainesville, Florida, United States We describe the development of a high-throughput, automated method for conducting TEM characterization of materials, to remove this bottleneck from the discovery process. We propose this approach will be of particular utility within the broad field of block copolymer amphiphile assembly, where researchers wish to rapidly formulate for phases of interest including vesicles in drug delivery, fragrance and cosmetic formulation. A vesicle phase is not immediately accessible, without screening block sizes and conditions, and is difficult to converge on using DLS for example, but rather often requires analysis by TEM combined with more sophisticated scattering experiments. In this presentation, we will describe the very rapid generation (hours of work as opposed to months) of phase diagrams for block copolymer amphiphiles. We demonstrate the high-throughput approach for two separate types of amphiphilic block copolymers. One type, consisting of poly(ethylene glycol)-block-poly(hydroxypropyl methacrylate), the other consisting of poly(2-(dimethylamino)ethyl methacrylate)-block- poly(hydroxypropyl methacrylate), were each prepared by systematically varying the degree of polymerization of the hydrophobic block. These were each synthesized in 96- well plates to rapidly generate a range of morphologies in aqueous solution. In this manner, 45 different assembled polymer samples were prepared at a time. These samples were sampled by automated picoliter volume liquid handling (piezoelectric robotic dispenser) and analyzed by automated transmission electron microscopy (TEM by SerialEM) and automated image analysis to rapidly generate phase diagrams. Moreover, we will describe approaches for conducting polymerization and assembly of nanomaterials in situ, in a liquid TEM cell. Linking the process of reaction development and discovery directly to the process of imaging materials. POLY 2: Accelerated polymerization-induced self-assembly using automated continuous-flow reactors Nicholas Warren, [email protected]. University of Leeds, Leeds, United Kingdom Continuous-flow synthesis is becoming one of the key technologies for sustainable and reproducible manufacture of advanced chemical products. For polymer syntheses, it offers numerous potential advantages with respect to precision control, safety, reduced energy usage and facile scale up. The implementation of continuous-flow reactor platforms for RAFT polymerization is currently being reported by several significant research groups, who have demonstrated excellent control and the ability to produce well-defined polymers and polymer nanoparticles. Alongside the developments in continuous manufacturing processes are those in RAFT polymerization technology itself. including polymerization-induced self-assembly (PISA) and Ultrafast (UF) RAFT polymerisation. PISA enables the in-situ formation of block copolymer nanoparticles while UF RAFT reduces reaction times from hours down to minutes. Herein, we demonstrate that by combining continuous-flow platforms with the latest advances in RAFT polymerization, it is possible to accelerate the synthesis of diblock copolymer nanoparticles via aqueous dispersion polymerization. By judiciously selecting fast propagating monomers and initiators which have very short half-lives at elevated temperatures, diblock copolymer nanoparticles can be produced in under 20 minutes. Moreover, by automating the reactors, the operator merely needs to prepare the primary solutions, program the pumps and collect the sample. This method has important implications with respect to efficient, highly reproducible, multi-scale manufacture, particularly as automation enables the development of artificially intelligent reactor systems. POLY 3: How do diblock copolymer micelles form during polymerization-induced self-assembly? Matthew J. Derry, [email protected], Oleksandr Mykhaylyk, Anthony J. Ryan, Steven P. Armes. Department of Chemistry, University of Sheffield, Sheffield, United Kingdom Reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of a range of vinyl monomers enables the convenient synthesis of diblock copolymer spheres, worms or vesicles in various solvents. Such formulations are an example of polymerization-induced self-assembly (PISA). Chain extension of a soluble stabilizer block with a suitable monomer initially produces soluble diblock copolymer chains. Micellar self-assembly occurs at some critical degree of polymerization (DP) for the growing insoluble block. After this nucleation event, sterically-stabilized nanoparticles grow in size. Depending on the precise PISA formulation, various morphological transitions can be observed by time-resolved small-angle X-ray scattering (SAXS). In the present work, poly(stearyl methacrylate)-poly(benzyl methacrylate) (PSMA31- PBzMA2000) spheres are targeted in mineral oil. Remarkably, the nascent particles that are formed during micellar nucleation are non-spherical (see Figure 1). Systematic variation of this PISA formulation indicated that such anisotropic aggregates are only formed when the monomer concentration is sufficiently high (i.e. when a relatively high insoluble block DP is targeted). Figure 1. SAXS patterns recorded for PSMA31-PBzMA2000 spheres in mineral oil (left), corresponding pair-distance distribution functions (PDDFs) obtained by indirect Fourier transformation of the experimental SAXS patterns (centre) and ab initio low resolution structure of the scattering objects derived from these SAXS data (right). POLY 4: RAFT dispersion polymerization in silicone oil Matthew J. Rymaruk1,2, [email protected], Saul J. Hunter4, Cate O'brien2, Steven Brown3, Clive Williams3, Steven P. Armes2. (1) Chemistry, University of Sheffield, Beverley, United Kingdom (2) Univ of Sheffield Dept of Chem, Sheffield, United Kingdom (3) Scott Bader Company Ltd, Northamptonshire, United Kingdom (4) University of Sheffield, Sheffield, United Kingdom We describe the synthesis of diblock copolymer nanoparticles in low-viscosity silicone oils. More specifically, a near-monodisperse monohydroxy-terminated polydimethylsiloxane was esterified using a carboxylic acid-functionalized trithiocarbonate to yield a PDMS66 precursor with a mean degree of functionality of 92 %. This PDMS66 precursor was then chain-extended in turn using nine different methacrylic monomers in a low-viscosity silicone oil (decamethylcyclopentasiloxane). In each case the target DP of the core-forming block was fixed at 200 and the copolymer concentration was 25 % w/w. Transmission electron microscopy studies indicated that kinetically-trapped spheres were obtained in almost all cases. The only exception was 2-(dimethylamino)ethyl methacrylate (DMA), which enabled access to spheres, worm or vesicles. This striking difference is attributed to the relatively low glass transition temperature for this latter block. A phase diagram was constructed for a series of PDMS66-PDMAx nano-objects by systematically increasing the PDMA target DP from 20 to 220 and varying the copolymer concentration between 10 and 30 % w/w. Higher copolymer concentrations were required to access a pure worm phase, whereas only spheres, vesicles or mixed phases were accessible at lower copolymer concentrations. Gel permeation chromatography studies indicated a linear evolution of number-average molecular weight with PDMA DP while dispersities remained below 1.39, suggesting relatively well-controlled RAFT polymerizations. Small angle x-ray scattering was used to characterize selected examples of spheres, worms and vesicles. Finally, PDMS66- PDMAx worms were also prepared in n-dodecane, hexamethyldisiloxane
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