Thermo-responsive shape memory epoxy modified by linear monomers
Abastract:In order to meet the requirements of fiber-reinforced shape memory composites for aerospace applications in terms of matrix toughness,heat resistance and molding processability,the shape memory epoxy resin(SME)was modified by linear mono-mers such as sebacic acid(SA),hyperbranched polyester(HBP)and polyether polyol glycidyl ether(PPGE).It is shown that the best modification effect is achieved by introducing long aliphatic chains into SME using SA.Compared with the control group,the shape memory recovery time of the resin is shortened by 48.1%;the storage modulus at the deformation temperature is reduced by 98.76%.The tensile strength at room temperature is increased by 24.1%.The tensile modulus is reduced by only 13.7%.The elongation at break is increased by 121.3%.A small amount of HBP can improve the molecular network structure.But the molecular chain segments revert to linear when HBP is in excess.The addition of HBP improves the mechanical properties of the resin at room temperature,but it also leads to higher stiffness at the deformation temperature.PPGE lengthens the flexible chain segments,but it reduces the reaction rate of the system.The modification effect is poor.In addition,the modification of SA can effectively extend the process time of the system,while HBP has the opposite effect.PPGE has less impact on the processability.
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