TY - GEN
T1 - EFFECT OF CRYSTALLIZATION RATE OF SOFT SEGMENT ON SHAPE MEMORY EFFECT IN SHAPE MEMORY POLYURETHANE IONOMER
AU - Zhu, Yong
AU - Hu, Jinlian
AU - Choi, Ka-Fai
AU - Yeung, Kwok-Wing
PY - 2007/5
Y1 - 2007/5
N2 - To illustrate the effect of crystallization rate of soft segment on shape memory effect in shape memory polyurethane (SMPU) ionomer, SMPU ionomers having ionic group within hard segments were synthesized. Isothermal crystallization kinetic method was used to analyze the effect of ionic groups within hard segments on crystallization of soft segment. Thermal cyclic tensile testing was conducted to investigate the shape memory effect. It was found that the ionic group in hard segments slows down crystallization of soft segment; when physical cross link is strong enough, the crystallization rate would be a predominant factor determining the shape fixity ratio after various cooling time; when physical cross link is weakening, the influence of crystallization rate is much less for cooling time dependence of fixity.
AB - To illustrate the effect of crystallization rate of soft segment on shape memory effect in shape memory polyurethane (SMPU) ionomer, SMPU ionomers having ionic group within hard segments were synthesized. Isothermal crystallization kinetic method was used to analyze the effect of ionic groups within hard segments on crystallization of soft segment. Thermal cyclic tensile testing was conducted to investigate the shape memory effect. It was found that the ionic group in hard segments slows down crystallization of soft segment; when physical cross link is strong enough, the crystallization rate would be a predominant factor determining the shape fixity ratio after various cooling time; when physical cross link is weakening, the influence of crystallization rate is much less for cooling time dependence of fixity.
KW - Ionomer
KW - Isothermal crystallization
KW - Polyurethane
KW - Shape memory
UR - https://www.scopus.com/pages/publications/34648832292
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-34648832292&origin=recordpage
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 1604232145
SN - 9781604232141
VL - 2
T3 - Annual Technical Conference - ANTEC, Conference Proceedings
SP - 810
EP - 824
BT - Society of Plastics Engineers Annual Technical Conference
T2 - 65th Society of Plastics Engineers Annual Technical Conference (ANTEC 2007)
Y2 - 6 May 2007 through 11 May 2007
ER -