Rapid, On-Command Debonding of Stimuli-Responsive Cross-Linked Adhesives by Continuous, Sequential Quinone Methide Elimination Reactions
Dr. Hyungwoo Kim
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Search for more papers by this authorDr. Hemakesh Mohapatra
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Search for more papers by this authorCorresponding Author
Prof. Scott T. Phillips
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.htmlSearch for more papers by this authorDr. Hyungwoo Kim
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Search for more papers by this authorDr. Hemakesh Mohapatra
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Search for more papers by this authorCorresponding Author
Prof. Scott T. Phillips
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.html
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802 (USA) http://www.psu.edu/dept/phillipsgroup/index.htmlSearch for more papers by this authorAbstract
Adhesives that selectively debond from a surface by stimuli-induced head-to-tail continuous depolymerization of poly(benzyl ether) macro-cross-linkers within a poly(norbornene) matrix are described. Continuous head-to-tail depolymerization provides faster rates of response than can be achieved using a small-molecule cross-linker, as well as responses to lower stimulus concentrations. Shear-stress values for glass held together by the adhesive reach 0.51±0.10 MPa, whereas signal-induced depolymerization via quinone methide intermediates reduces the shear stress values to 0.05±0.02 MPa. Changing the length of the macro-cross-linkers alters the time required for debonding, and thus enables the programmed sequential release of specific layers in a glass composite material.
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- 7The 11 % value is based on the molar loading of the poly(benzyl ether) during the polymerization reaction (0.19 mol %; molar feed ratio of 6/4=1:526), the length of the poly(benzyl ether) (21 kDa), and the length of the poly(norbornene) (44 kDa).
- 8The contact area of the adhesives between slides was measured using Vernier calipers.
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- 10Three hours is longer than anticipated based on the relative results in Figure 4, but this result likely is caused by the reduced shear forces placed on the glass duplex that, once tipped, was oriented parallel rather than perpendicular to the surface of the solution. Overall, however, this demonstration clearly illustrates that 1 can be used not only for stimuli-induced debonding, but also for programmed, sequential separation and purification of materials from a larger composite.
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