Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session K40: Designed Polymer Surfaces for Adhesion, Release, Self-Cleaning, Anti-Fouling, and other ApplicationsInvited Undergraduate
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Sponsoring Units: DPOLY GSOFT Chair: Tirtha Chatterjee, Dow Chemical Co. Room: 387 |
Wednesday, March 15, 2017 8:00AM - 8:36AM |
K40.00001: Surface Modification by the Reversible, Electrochemical Deposition of Polyelectrolyte Complex Films Invited Speaker: Kenneth Shull Polyelectrolyte complex films made from oppositely charged polymer chains have applications as drug delivery vehicles, separation membranes, and biocompatible coatings. Conventional layer-by-layer techniques for polyelectrolyte coatings are low-throughput, multistep processes that are quite slow for building films on the order of micrometers. We have developed electrochemical processes for depositing thick ( > 1 $\mu m$ ) films within short experimental time scales ( 5 min). This rapid electrodeposition is achieved by exploiting the reduction of hydrogen peroxide at the working electrode, triggering the pH responsive self-assembly of a polyelectrolyte complex film composed of poly(acrylic) acid and poly(allylamine) HCl. In situ rheology using an electrochemical quartz crystal microbalance (EQCM) quantified the viscoelastic shear modulus of the films at a frequency of 15 MHz. The EQCM technique is ideally suited for basic studies of salt and pH-induced swelling, dissolution and deposition of PEC films. The dissolution/redeposition cycle is significant in that it provides route to ‘resettable’ fouling release surfaces. [Preview Abstract] |
Wednesday, March 15, 2017 8:36AM - 9:12AM |
K40.00002: Role of Monomer Sequence, Hydrogen Bonding and Mesoscale Architecture in Marine Antifouling Coatings Invited Speaker: Rachel Segalman Polypeptoids are non-natural, sequence specific polymers that offer the opportunity to probe the effect of monomer sequence, chirality, and chain shape on self-assembly and surface properties. Additionally, polypeptoid synthesis is more scaleable than traditional polypeptides suggesting their utility in large area applications. We have designed efficient marine anti-fouling coatings by using triblock copolymer scaffolds to which polypeptoids are tethered in order to tune both the modulus and surface energies with great precision. Surprisingly, when short sequences are tethered to a polymer backbone, polypeptoids consistently outperform analogous polypeptides in antifouling properties. We hypothesize that the hydrogen bonding inherent to the polypeptide backbone drives the observed differences in performance. We also find that the polymer scaffold housing the polypeptoids also plays a crucial role in directing surface presentation and therefore the overall coating properties. [Preview Abstract] |
Wednesday, March 15, 2017 9:12AM - 9:48AM |
K40.00003: Chimeric Plastics : a new class of thermoplastic Invited Speaker: Mark Sonnenschein A new class of thermoplastics (dubbed ``Chimerics'') is described that exhibits a high temperature glass transition followed by high performance elastomer properties, prior to melting. These transparent materials are comprised of co-continuous phase-separated block copolymers. One block is an amorphous glass with a high glass transition temperature, and the second is a higher temperature phase transition block creating virtual thermoreversible crosslinks. The material properties are highly influenced by phase separation on the order of 10-30 nanometers. At lower temperatures the polymer reflects the sum of the block copolymer properties. As the amorphous phase glass transition is exceeded, the virtual crosslinks of the higher temperature second phase dominate the plastic properties, resulting in rubber-like elasticity. [Preview Abstract] |
Wednesday, March 15, 2017 9:48AM - 10:24AM |
K40.00004: Scaling Principles for Understanding and Exploiting Adhesion Invited Speaker: Alfred Crosby A grand challenge in the science of adhesion is the development of a general design paradigm for adhesive materials that can sustain large forces across an interface yet be detached with minimal force upon command. Essential to this challenge is the generality of achieving this performance under a wide set of external conditions and across an extensive range of forces. Nature has provided some guidance through various examples, e.g. geckos, for how to meet this challenge; however, a single solution is not evident upon initial investigation. To help provide insight into nature's ability to scale reversible adhesion and adapt to different external constraints, we have developed a general scaling theory that describes the force capacity of an adhesive interface in the context of biological locomotion. We have demonstrated that this scaling theory can be used to understand the relative performance of a wide range of organisms, including numerous gecko species and insects, as well as an extensive library of synthetic adhesive materials. We will present the development and testing of this scaling theory, and how this understanding has helped guide the development of new composite materials for high capacity adhesives. We will also demonstrate how this scaling theory has led to the development of new strategies for transfer printing and adhesive applications in manufacturing processes. Overall, the developed scaling principles provide a framework for guiding the design of adhesives. [Preview Abstract] |
Wednesday, March 15, 2017 10:24AM - 11:00AM |
K40.00005: Role of Confined Water in Underwater Adhesion Invited Speaker: Ali Dhinojwala Surface bound water is a strong deterrent for forming strong bonds between two surfaces underwater and expelling that bound water is important for strong adhesion. I will discuss examples of different strategies used by geckos, spiders, and mussels to handle this last layer of bound water. Recent results using infrared-visible sum frequency generation spectroscopy to probe the structure of this bound water will be discussed. [Preview Abstract] |
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