Skip to main content
×
×
Home

Influence of Compression Direction on the Shape-Memory Effect of Micro-Cylinder Arrays Prepared from Semi-Crystalline Polymer Networks

  • Yi Jiang (a1) (a2), Liang Fang (a1), Karl Kratz (a1) and Andreas Lendlein (a1) (a2)
Abstract

Microstructured polymeric surfaces capable of a thermally-induced shape-memory effect (SME) can perform on demand changes of surface properties such as wettability or adhesion.

In this study, we explored the influence of the applied compression direction during programming, i.e. vertical compression and tilted compression, on the SME of microstructured crosslinked poly[ethylene-co-(vinyl acetate)] (cPEVA) films comprising arrays of micro-cylinders with a height of 10 µm and different diameters of 10 µm, 25 µm, and 50 µm. The shape recovery of the microstructures during heating was visualized online by optical microscopy, while atomic force microscopy (AFM) was utilized to investigate the temperature-induced shape change of single micro-cylinders. Here, the changes in micro-cylinder height and the characteristic angle θ were followed and analyzed for quantification of the shape-memory performance. Both compression modes resulted in almost flat programmed surfaces as indicated by high shape fixity ratios of R f ≥ 93±1%. A nearly complete recovery of the micro-cylinders was obtained for all investigated cPEVA samples documented by high shape recovery values of R r ≥ 97±1%, while the obtained shape change of the micro-cylinders during recovery almost reversely recalled the applied deformation during programming. The presented capability of SMP microstructured substrates to memorize the way of deformation during programming could be a new tool for controlling particular shape changes of microstructures during recovery and in such a way the generated local recovery forces can be adjusted.

Copyright
Corresponding author
*(Email: karl.kratz@hzg.de)
References
Hide All
1. Sauter, T., Heuchel, M., Kratz, K. and Lendlein, A., Polym Rev 53, 6 (2013).
2. Lee, E. and Yang, S., MRS Commun 5, 97 (2015).
3. Reddy, S., Arzt, E. and del Campo, A., Adv Mater 19, 3833 (2007).
4. Xu, H. X., Yu, C. J., Malyarchuk, V., Xie, T. and Rogers, J., Abstr Pap Am Chem S 245 (2013).
5. Lee, E., Zhang, M. L., Cho, Y., Cui, Y., Van der Spiegel, J., Engheta, N. and Yang, S., Adv Mater 26, 4127 (2014).
6. Ebara, M., Uto, K., Idota, N., Hoffman, J.M. and Aoyagi, T., Soft Matter 9, 3074 (2013).
7. Le, D. M., Kulangara, K., Adler, A. F., Leong, K. W. and Ashby, V. S., Adv Mater 23, 3278 (2011).
8. Davis, K. A., Burke, K. A., Mather, P. T. and Henderson, J. H., Biomaterials 32, 2285 (2011).
9. Heuchel, M., Al-Qaisi, L., Kratz, K., Nöchel, U., Behl, M. and Lendlein, A., Mater Res Soc Symp Proc, 1718, 123130 (2015).
10. Kratz, K., Madbouly, S.A., Wagermaier, W. and Lendlein, A., Adv Mater 23, 4058 (2011).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Advances
  • ISSN: -
  • EISSN: 2059-8521
  • URL: /core/journals/mrs-advances
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed