Adhesive Composites Alex Nathan Kahn Independent Study (ME 497 SK) Instructor: Professor Seok Kim Laboratory Mentor: Jeffrey D. Eisenhaure 2015/5/13
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1 Adhesive Composites Alex Nathan Kahn Independent Study (ME 497 SK) Instructor: Professor Seok Kim Laboratory Mentor: Jeffrey D. Eisenhaure 2015/5/13
2 Table of Contents Purpose and scope 1 Results and discussion 1 Conclusions and recommendations 1 Appendix A1 Figures A1 Results and discussion paragraph 1 A1 R/D par. 2 A2 R/D par. 3 A4 R/D par. 4 A6 R/D par. 5 A8 Conclusions and recommendations A9 References A9
3 1 Purpose and scope Transfer printing is a method to transfer micro/nanoscale solid objects, i.e. inks, from a substrate where they are created to another substrate via polymeric stamps [1]. Professor Seok Kim and graduate student Jeffrey D. Eisenhaure use microtipped SMP stamps to deposit microscale inks through a process called micro-masonry, which involves transfer printing and material bonding [2]. This study was performed in order to investigate the reversible dry adhesion of SMP and an adhesive elastomer (AE) on a macroscale in order to determine the feasibility of transfer printing of microscale inks via AE/SMP stamps. Material compositions are consistent with Eisenhaure s shape memory polymer formulation and with a bi-layer system developed at General Motors [3,4]. Results and discussion Initial testing involved the use of polydimethyl(siloxane) (PDMS) as a mold agent in order to investigate molding techniques. Figures 1 and 2 depict a carbon black (CB) doped SMP array suspended in PDMS, and a convex PDMS mold cured in a suctioned jar lid. Various molding environments were investigated such as the one displayed in Fig. 3, but eventually 3D printed mold positives were adopted for repeatable PDMS mold manufacture, Fig. 4. Dry adhesive samples were first manufactured with a metal backing layer and a macropost protrusion array analogous to microtip stamp designs, Fig. 5 and 6, but bubbles incurred through curing caused coarse surface quality, Fig. 7. A flat mold positive provided for improved surface quality, Fig. 8 and 9, and reversible bond to glass was achieved with a 90 C preload, Fig. 10. More flat molds were manufactured for increased cure batch size, Fig. 11, and SMP disks were manufactured along with AE disks that adhered to glass without 90 C preload, Fig. 12. Composite samples were made by laminating an SMP disk to an AE disk with SMP cured in the space between, or by dipping SMP in AE and then curing on a glass plate. While they could bond to glass, initial samples were warped, Fig. 13, so a weighted sandwich cure was adopted, Fig. 14. Both types of flat samples demonstrated self-peeling edges at 90 C, Fig. 15 and 16. Lamination variations were investigated, Fig. 17 and 18, while four available wet adhesives were tested, Fig. 19, in order to connect samples to rings that would be used for loading during testing. An array of smaller 10mm diameter molds was manufactured, Fig. 20, so that samples could be made which would not experience load concentrations near the region of ring attachment, and an externally available wet adhesive and sandpaper were purchased in order to attach rings, Fig. 21, after available adhesives proved insufficient. Available masses were weighed and catalogued in order to provide an adhesion testing environment, Fig. 22. The first sample was preloaded by hand at room temperature, Fig. 23, before weights were suspended from the sample s ring, Fig. 24. After a room temperature preload, the sample supported at most 14.9 N/cm 2. No sample could hold nearly as much load if preloaded at 90 C, or if preloaded at 90 C before being eventually reheated to 90 C. Conclusions and recommendations The greatest testing drawback was AE degradation. The dipped AE layer stripped from SMP after heating to 90 C during final tests, Fig. 25, and throughout other earlier tests. Disks
4 2 also tore on multiple occasions, like during removal from 10mm PDMS molds, Fig. 26. Due to its erratic nature AE is not recommended for use on a microscale. However, SMP demonstrated durability and reliable thermal warping capabilities that make it ideal for transfer printing.
5 A1 Appendix Figures Figure 1: CB-doped SMP array suspended in PDMS. Figure 2: Convex PDMS mold negative. Figure 3: Dish-based SMP mold holding convex PDMS negative.
6 A2 Figure 4: 3D printed 90mm diameter mold positives with PDMS negatives. Figure 5: Metal-backed SMP sample manufacture. Figure 6: Metal-backed SMP samples with macropost protrusion array.
7 A3 Figure 7: Metal-backed SMP macropost protrusion array surface quality. Figure 8: Flat 45mm diameter 3D printed mold positive and PDMS negative. Figure 9: Flat metal-backed SMP sample testing excision.
8 A4 Figure 10: Flat metal-backed SMP sample bonded to glass. Figure 11: Manufacture of 3D printed mold positive batch. Figure 12: AE disks adhering to glass without 90 C preload.
9 A5 Figure 13: Warped AE-dipped SMP sample supporting glass plate after 90 C preload. Figure 14: Samples curing in molds and with sandwich style technique. Figure 15: AE-dipped SMP edge self-peeling at 90 C.
10 A6 Figure 16: AE/SMP laminate edge self-peeling at 90 C. Figure 17: SMP lamination dispersion variation 1. Figure 18: SMP lamination dispersion variation 2.
11 A7 Figure 19: Two of the four wet adhesives tested. Figure 20: Array of 10mm diameter 3D printed mold positives and PDMS negatives. Figure 21: Bonding of rings to 10mm samples with sandpaper for surface preparation.
12 A8 Figure 22: Adhesion testing environment. Figure 23: Preloading AE-dipped SMP at room temperature. Figure 24: Weight suspended from sample preloaded at room temperature.
13 A9 Figure 25: AE degradation after 90 C preload. Figure 26: AE tearing upon removal from 10mm PDMS molds. References [1] J. D. Eisenhaure, S. Kim et al., The Use of Shape Memory Polymers for Microassembly by Transfer Printing, JMEMS Lett., vol. 23, no. 5, pp , Oct [2] J. D. Eisenhaure, S. Kim et al., Microstructured Shape Memory Polymer Surfaces with Reversible Dry Adhesion, ACS Appl. Mater. Interfaces, vol. 5, pp , Aug [3] J. D. Eisenhaure, S. Kim, An Internally Heated Shape Memory Polymer Dry Adhesive, Polymers, vol. 6, pp , Aug [4] J. Xie, X Xiao. Self-Peeling Reversible Dry Adhesive System, Chem. Mater., vol. 20, pp , Apr
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