Functionally graded shape memory polymer

Kyung Min Lee, Patrick T. Mather

Research output: Chapter in Book/Entry/PoemConference contribution


In this paper, we present a new concept in for shape memory polymers (SMPs): functionally graded SMP. To make such a material, a commercially available UV curable polymer, NOA63, was cured by high intensity ultraviolet irradiation for various reaction times ranging from 5 min to 3.5 hours. The photo-cured NOA63 samples were characterized using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and optical microscopy (OM) in order to investigate the high quality of shape fixing and recovery. The glass transition temperature was precisely controlled by varying the UV exposure time, resulting in NOA63 having Tg from 30 °C to 47 °C DMA measurements for NOA63 revealed increasing tensile storage modulus with increasing crosslink density. A NOA63 sample was photo-cured in a spatially graded fashion, with different exposure times at different positions on for the same sample, demonstrating the possible usage of an optical temperature sensor or medical devices. Bulk and surface shape memory responses were investigated, revealing high quality shape fixing and recovery.

Original languageEnglish (US)
Title of host publicationSociety of Plastics Engineers Annual Technical Conference
Subtitle of host publicationPlastics Encounter at ANTEC 2007, Conference Proceedings
Number of pages4
StatePublished - 2007
EventSociety of Plastics Engineers Annual Technical Conference: Plastics Encounter at ANTEC 2007 - Cincinnati, OH, United States
Duration: May 6 2007May 11 2007

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings


OtherSociety of Plastics Engineers Annual Technical Conference: Plastics Encounter at ANTEC 2007
Country/TerritoryUnited States
CityCincinnati, OH


  • Gadual UV curing
  • Photo-curable shape memory polymer
  • Surface and bulk shape memory behaviors

ASJC Scopus subject areas

  • General Chemical Engineering
  • Polymers and Plastics


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