Recently, group of Xi'an traffic university Professor Zhang Yanfeng developed a kind to have the strong mechanical performance and good biology consistence, covalence that with dynamic sulfur key of acting ammonia ester regards dynamic and reversible cross-linking as the dot but comfortable network, realized 4D to print. relatively print colophony at 3D of traditional smooth solidify, this material has exceedingly good self-educated answer sex, heavy plasticity, in siren of robot, intelligence, biology the domain such as embedded body has very large potential application space.
Because its are in,4D is printed medicine of intelligent equipment, biology and the potential application in organizing a project, aroused the great interest of scientific research and industrial domain. Among them, because appearance memory polymer has deformation big, weight is light, restore stress big, answer speed to wait for an advantage quickly, crucial in the 4D material that print. However, 4D prints appearance to remember polymer to be comprised by the network of covalent cross-linking normally, changeless permanent appearance brings about its appearance to recover way onefold, limitted the flexibility that 4D prints.
In addition, although smooth solidify 3D is printed,have taller precision, resolution and exterior quality, but the structure of appearance memory polymer that at present smooth solidify 3D prints does not dissolve as a result of its and network of infusible covalence cross-linking, the printing structure of earning cannot reclaim, cannot repair, create serious economy and environmental problem thereby. Accordingly, the high strength that development uses at 4D to print, can reframe for many times, can reclaim and but the material of self-healing is crucial.
Zhang Yanfeng of Xi'an traffic university teachs a group to pass a series of tests, got resolution tall, surface gets together glossily sulfur ammonia ester (4DP-PTU) structure. relatively print colophony at 3D of traditional smooth solidify, because ester of trends sulfur acting ammonia bolts and 4DP-PTU has exceedingly good self-educated answer sex, heavy plasticity. The 4DP-PTU structure that print is in after producing damage, the means that can print ” again through “ section has repair, make function restores to be like first, and can pass simple hot pressing processing to 4DP-PTU powder, implementation cicatrizations oneself with arrive from powder the heavy model of a body material, and the mechanical property that self-healing closes or still keeps as identical as former lump material after heavy model, solved already 4D prints a technology to realize capture and the problem that release at the same time hard, hopeful applies at robot domain.
