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Research Papers

Light Activated Shape Memory Polymer Characterization—Part II

[+] Author and Article Information
Richard V. Beblo

Lisa Mauck Weiland1

Department of Mechanical Engineering and Materials Science,  University of Pittsburgh, Pittsburgh, PA 15261lmw36@pitt.edu

1

Corresponding author.

J. Appl. Mech 78(6), 061016 (Aug 25, 2011) (9 pages) doi:10.1115/1.4004552 History: Received March 13, 2010; Revised July 08, 2011; Posted July 11, 2011; Published August 25, 2011; Online August 25, 2011

Presented are the experimental results of two light activated shape memory polymer (LASMP) formulations. The optical stimulus used to activate the materials is detailed including a mapping of the spatial optical intensity at the surface of the sample. From this, results of energy calculations are presented including the amount of energy available for transitioning from the glassy state to the rubbery state and from the rubbery state to the glassy state, highlighting one of the major advantages of LASMP as requiring less energy to transition than thermally activated shape memory polymers. The mechano-optical experimental setup and procedure is detailed and provides a consistent method for evaluating this relatively new class of shape memory polymer. A chemical kinetic model is used to predict both the theoretical glassy state modulus, as only the sample averaged modulus is experimentally attainable, as well as the through thickness distribution of Young’s modulus. The experimental and model results for these second generation LASMP formulations are then compared with earlier LASMP generations (detailed previously in Beblo and Mauck Weiland, 2009, “Light Activated Shape Memory Polymer Characterization,” ASME J. Appl. Mech., 76 , pp. 8) and typical thermally activated shape memory polymer.

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Copyright © 2011 by American Association of Physics Teachers
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References

Figures

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Figure 1

Trans-cis reation of azobenzene when exposed to UV radiation [24]

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Figure 2

Photo crosslinking reaction of cinnamic acid [24]

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Figure 3

Experimental setup

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Figure 4

Optical stimulus incident on sample, top—contour plot; bottom, surface plot

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Figure 5

Time evolution of Young’s modulus with exposure to 250 and 310 nm light, top—formulation 1; bottom—formulation 2

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Figure 6

Formulation 1 experimental and model predicted evolution of Young’s modulus

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Figure 7

Through thickness evolution of Young’s modulus

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Figure 8

Formulation 2 experimental and model predicted evolution of Young’s modulus

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Figure 9

Through thickness evolution of Young’s modulus

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