Effects of hard-segment content on the shape memory properties of segmented polyurethanes

Fenglong Ji, Jinlian Hu, Haojun Fan, Waiman Yu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

Some segmented polyurethanes are reported showing shape memory properties. Whereas the relationship between structures and shape-memory properties of these polymers is still not clear. In this study, a series of polyurethanes having crystalline soft segments with varying hard-segment content were synthesized. Their morphology was characterized with differential scanning calorimetry (DSC), thermomechanical analysis (TMA). The DSC tests revealed that the crystallinity of soft-segment phase decreases as increasing hard-segment content. The TMA studies proved that in the hard-segment content range 40%-45% the hard-segment phase changes from discontinuity to continuity. This was further verified by the tensile hysteresis tests. The thermomechanical cyclic tests revealed that the segmented polyurethanes having discrete hard microdomains showed about 90% shape recovery while the ones having continuous hard microdomains exhibited dramatically decreased shape recovery.
Original languageEnglish
Title of host publication"New Century, New Materials and New Life" - Proceedings of 2005 International Conference on Advanced Fibers and Polymer Materials, ICAFPM 2005
PublisherChina Press
Pages64-67
Number of pages4
Volume1
ISBN (Print)7502577173, 9787502577179
Publication statusPublished - 1 Jan 2005
Event2005 International Conference on Advanced Fibers and Polymer Materials, ICAFPM 2005 - Shanghai, China
Duration: 19 Oct 200521 Oct 2005

Conference

Conference2005 International Conference on Advanced Fibers and Polymer Materials, ICAFPM 2005
CountryChina
CityShanghai
Period19/10/0521/10/05

ASJC Scopus subject areas

  • Biomaterials
  • Polymers and Plastics

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