Free Workshop on "Polymer Adhesion"
The IPrime Microstructured Polymers (MP) program (Chris Macosko organizing) is offering a Polymer Adhesion workshop focusing on Polymer-Polymer adhesion with applications to pressure sensitive and hot melt adhesives.
IPrime WORKSHOP SPONSORED BY The IPrime Microstructured Polymers (MP) Program
Open to IPrime member companies, invited guests, faculty and students (For those considering IPrime membership, please contact Bob Lewis, email@example.com, about attending these workshops free of charge as an IPrime guest.)
Organizer: Chris Macosko, 612-625-0092, firstname.lastname@example.org
Wednesday, January 14, 2009, 8:00 AM to 5:00 PM
Electrical Engineering/Computer Science Building - Room 3-210
University of Minnesota Campus, East Bank
Full Workshlop Schedule:
- 8:00 Coffee, juice, bagels & donuts & fruit
- 8:25 Welcoming Remarks
- 8:30 Al Pocius, 3M
Abstract: Adhesion is the physical attraction of the surface of one material for the surface of another. It seems from this definition that this should be a straightforward measurement. Problems occur when the practitioner does not take into account the ways in which mechanical energy can be dissipated in either the adherends or in the bulk of the adhesive. This presentation will discuss methods of adhesion measurement from contact angles to peel measurements. The vagaries of the methods will be discussed as well as measurements which directly obtain the work of adhesion.
- 9:30 Eric Silverberg, Henkel-National Starch
"Pressure Sensitive Adhesives (PDF dowload for Members Only)"
Abstract: Pressure sensitive adhesives cover a very broad range of applications from the simple paper label to critical electronic and medical applications. This talk will cover the basic definitions, chemistries, and polymer science of this class of adhesives. In addition, a selection of current challenges will be described.
- 10:00 Break
- 10:30 Jonathan Wilker, Purdue
"Adhesion at the Beach: Characterization and Synthetic Polymer Mimics of Mussel and Barnacle Glues"
Abstract: The oceans are home to a diverse collection of organisms producing intriguing materials. Mussels, barnacles, starfish, and kelp generate adhesive matrices for affixing themselves to the sea floor. Our laboratory is characterizing the bonding of mussel and barnacle adhesives as well as developing related bioinspired synthetic materials. Characterization efforts include work with live animals, extracted proteins, and small molecule peptide models. These studies indicate that iron and protein-based radicals are key to formation of mussel adhesive. Based upon such characterization insights, we are now developing synthetic mimics of marine bioadhesives. Bulk polymers, such as polystyrene, provide simple backbones for mimicking the polypeptides of adhesive proteins. Into such polymers we are incorporating catechol-containing monomers, thereby representing the DOPA residues of adhesive proteins. Cross-linking of these new polymers reveals a reactivity profile similar to that of extracted adhesive proteins. Cross-linking also imparts bulk adhesive properties. Adhesion strengths can rival commercial cyanoacrylate "super glues"
- 11:10 Kim Chaffin, Medtronic, Ann Gronda, Ph.D. TransBioMat Consulting LLC, St. Paul
"Tissue Adhesives: Applications at a Device Company"
Abstract: Tissue adhesives have evolved over the last 20 years primarily to replace sutures and staples. Benefits of adhesives include decreased surgeon time, reduced infection rates, and improved cosmetic outcomes. As medical device interventions become less invasive, there is a growing opportunity to combine tissue adhesives and medical devices to achieve better outcomes, reduce implant trauma, and expand opportunities for bioerodable devices. During this talk, we will review the classes and applications of tissue adhesives currently available, outline the need for tissue adhesives in medical device applications, and discuss the unmet need for such applications.
- 11:40 Jeremy Yarwood, 3M
"Bacterial Adhesion to Surfaces"
Abstract: Bacteria have numerous mechanisms by which they adhere to a broad range of surfaces ranging from non-specific interactions (e.g. hydrophobic, elecrostatic) to specific (e.g. ligand-receptor). The diversity in microbial cell-surface characteristics only adds to the difficulty in controlling bacterial adhesion. These adhesion events are frequently the first step in formation of bacterial biofilms, which can be difficult to treat or remove. This talk will give an overview of bacterial adhesion to medically and industrially-relevant surfaces and strategies for preventing bacterial attachment.
- 12:10 Break (box lunch provided for industrial members and guests, speakers and faculty)
- 1:20 Ali Dhinojwala, University of Akron
Wall climbing lizards such as geckos have unique ability to attach to different surfaces without using viscoelastic glues. The micron-size hairs on the gecko feet make intimate contact and adhere to rough surfaces using van der Waals interactions. This carpet of hairs on the gecko feet also keeps the gecko feet clean and retains the adhesion in dusty environments. Synthetic gecko-inspired materials could form the basis of a new class of adhesives that would include two contradictory properties of self-cleaning and high adhesion. These adhesives will be useful for applications in the areas of wall-climbing robots, reversible adhesives, and adhesives suitable for use in space and electronic applications. In my presentation, I will discuss our strategy of using micro-patterned vertically aligned carbon nanotubes (CNT) to mimic the micron-size hairs found on the gecko feet. These CNT structures can be transferred to flexible plastic films to create flexible adhesive tapes. The hierarchical patterns of individual carbon nanotubes (8-10 nm in diameter) arranged in micron-size patches (50-500 nms) are important in mimicking the adhesion and self-cleaning properties observed by geckos.
- 2:00 Richard Lindmark, Boese-Warner & Associates
"Back to the Future: Biobased Adhesive Technology"
Abstract: Modern manufacturing processes rely heavily on adhesives to create structures of disimilar materials at high speeds and low cost. The vast majority of these adhesives are based on petroleum and natrual gas derived feedstocks which are byproducts of gasoline, polyethylene and polyproplyene production . With the increased cost of oil, concern over global warming and the finite nature of global oil supplies, renewable, sustainable sources of polymers and materials from which films, molded parts, adhesives, coatings and sealants can be made has taken on increased interest. Today bio is fast becoming the new nano.
This talk will review the history of biobased adhesives and discuss several different models for the use of renewable, sustainable biobased materials for adhesives. It will explore some fundamental differences between biobased and petrochemical based adhesive materials using a very successful biobased polymer and its side streams as an example.
- 2:30 Chris Macosko, U MN
"Polymer-Polymer Adhesion via Interfacial Reaction (PDF dowload for Members Only)"
Abstract: Significant slip can occur during flow of two immiscible polymers due to reduced entanglements at their interface. The slip is of practical importance because of its effect on morphology and adhesion of these multi-phase materials, such as disordered two-phase blends and multilayer films. Polymer-polymer adhesion decreases with stress and appears to correlate with increased slip velocity. Interfacial reaction can overcome the loss of entanglements by stitching chains across the interface. We demonstrate this with coupling between amine functional polymers and polyurethanes and model anhydride functional polymers.
- 3:00 Break
- 3:30 Sharf Ahmed, Steve Jorissen; H.B. Fuller
"Hot Melt Adhesives"
Abstract Hot melt adhesive formulations using various raw materials will bepresented. The presentation will also include a unique example of a hot melt formulation, which can bond and debond as needed for a manufacturing application.
- 4:00 Marc Hillmyer, U MN
"Routes to renewable triblock copolymers for adhesive applications"
Abstract: Large-volume, commercial polymers are derived from petrochemical feedstocks. The development of renewable feedstocks for established and new polymeric materials is gaining momentum in marketplace, as exemplified by the industrial-scale production of polylactide, polyhydroxyalkanoates, and other polymers with varying levels of renewable content. I will present our efforts to convert members of the terpene family, a broad class of naturally-occurring isoprenoids, into new polymeric materials. Specifically, I will discuss how menthol can be transformed into a low Tg, amorphous polyester that is useful as a soft segment in all biorenewable thermoplastic elastomers. These new hybrid macromolecules have potential utility as biorenewable pressure sensitive adhesives.
- 4:30 Panel summarizing important issues, questions for speakers
- 5:00 Adjourn
Printable Workshop Schedule (PDF)