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Stimuli responsive microscale architectures: Two-​photon lithography with shape memory polymers

Luizetta, Navrazhnykh and Greer, Julia (2019) Stimuli responsive microscale architectures: Two-​photon lithography with shape memory polymers. In: 257th ACS National Meeting & Exposition, 31 March - 4 April 2019, Orlando, FL. https://resolver.caltech.edu/CaltechAUTHORS:20190225-072508371

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Abstract

3D architectures with nearly arbitrary geometry and features on the submicron scale can be fabricated using direct laser writing, which gives rise to unique combinations of properties, such as high strength-​to-​wt. ratios and superior mech. resilience of micro- and nanolattices. Inducing a shape transformation of the constituent solid that comprises such architected materials in response to external stimuli could lead to a controllable and substantial change in the mech. response of the structure. One class of such solids is shape memory polymers, in which crosslinked elastomer shape memory networks can be deformed in the rubbery state and maintain the deformed shape when cooled to the glassy state. The original shape is then recovered in response to heat. We developed a benzyl methacrylate-​based resist that can be polymd. into such networks via direct laser writing. We then conducted a suite of dynamic mech. anal. (DMA) nanomech. expts. at 22°C to 90°C on individual microscale pillars, which measured their storage and loss moduli, to det. glass transition temp. We obsd. a shape memory phenomenon in all fabricated 3D architectures with submicron features and arbitrary geometries. Programming was accomplished by first deforming the samples at 77°C and cooling them to glassy state at 30°C. After load removal, the structures remained deformed until heated to 90°C, when they recovered >95​% of the original height.


Item Type:Conference or Workshop Item (Paper)
Related URLs:
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https://www.acs.org/content/acs/en/meetings/national-meeting.html?sc=meetings_1800815_mtg_OR19_odOrganizationConference Website
ORCID:
AuthorORCID
Greer, Julia0000-0002-9675-1508
Additional Information:© 2019 American Chemical Society.
Record Number:CaltechAUTHORS:20190225-072508371
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190225-072508371
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93191
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Feb 2019 16:28
Last Modified:03 Oct 2019 20:51

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