title: Shape memory polymers with high and low temperature resistant properties.
abstract: High temperature shape memory polymers that can withstand the harsh temperatures for durable applications are synthesized, and the aromatic polyimide chains with flexible linkages within the backbone act as reversible phase. High molecular weight (Mn) is demanded to form physical crosslinks as fixed phase of thermoplastic shape memory polyimide, and the relationship between Mn and glass transition temperature (Tg) is explored. Thermoset shape memory polyimide shows higher Tg and storage modulus, better shape fixity than thermoplastic counterpart due to the low-density covalent crosslinking, and the influence of crosslinking on physical properties are studied. The mechanism of high temperature shape memory effects based on chain flexibility, molecular weight and crosslink density is proposed. Exposure to thermal cycling from +150 °C to -150 °C for 200 h produces negligible effect on the properties of the shape memory polyimide, and the possible mechanism of high and low temperature resistant property is discussed.
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.|Harbin Institute of Technology, Centre for Composite Materials and Structures, No. 2 YiKuang Street, Harbin 150080, People's Republic of China.
authors.forename: Xinli
authors.initials: X
authors.lastname: Xiao
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Deyan
authors.initials: D
authors.lastname: Kong
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Xueying
authors.initials: X
authors.lastname: Qiu
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Harbin Institute of Technology, Department of Astronautical Science and Mechanics, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Yanju
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Shen
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Harbin Institute of Technology, Centre for Composite Materials and Structures, No. 2 YiKuang Street, Harbin 150080, People's Republic of China.
authors.forename: Fenghua
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Harbin Institute of Technology, Department of Chemistry, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Harbin Institute of Technology, Centre for Composite Materials and Structures, No. 2 YiKuang Street, Harbin 150080, People's Republic of China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Leng