Shape memory effects of polyurethane block copolymers cross-linked by celite |
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Authors: | Jong Shin Park Yong-Chan Chung Sang Do Lee Jae Whan Cho Byoung Chul Chun |
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Institution: | (1) Department of Chemistry, The University of Suwon, Gyeonggi-do, 445-743, Korea;(2) Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul, 151-742, Korea;(3) Department of Textile Engineering, Konkuk University, Seoul, 143-701, Korea;(4) Department of Polymer Engineering, The University of Suwon, Gyeonggi-do, 445-743, Korea |
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Abstract: | The shape memory polyurethane (PU) copolymers cross-linked by celite, a porous inorganic material with enormous surface area
and hydroxyl groups on the surface, were prepared to see if the shape memory effect and the mechanical properties were improved.
The PU copolymers with different celite contents were compared and characterized by IR, DSC, DMA, and UTM. The melting temperatures
of PU soft segment were around 20 oC independent of celite content. The shape memory effect and mechanical properties were
dependent on the celite content, and the celite addition into the reaction mixture should be made in the middle of polymerization
to get the best shape memory and mechanical properties. The best mechanical properties were found at 0.2 wt% celite content
and its shape retention rate went up to 98 %. The inclusion of celite as a cross-linker increased both shape memory effect
and mechanical properties. The reasons underlining the improvements by adopting celite as a cross-linker are discussed in
this paper. |
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Keywords: | Shape memory effect Celite Polyurethane Cross-linking |
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