Research And Performance Regulation Of Thermal Memory Based On Hydrogen-bonded Supramolecular Polymers

With the advent of the 5G era,information technology has become more globalized and multi-media,resulting in a surge in mobile data usage.Against this backdrop,the devices that store and process information,such as the memory,confront increasing problems.Currently,the traditional semiconductor memory has gradually approached the limit of development,and it seems urgent to investigate the storage materials for increased storage density,faster response,longer storage life,better dependability,lower cost,and easier processibility.On the other hand,if the densities of electronic devices and semiconductor devices are exclusively high,hot spots in the local area will form,destroying devices and wasting energy.Therefore,under the dual pressure of device performance and source-saving energy,it is necessary to develop a memory that can not only meet the basic requirements of memory performance but also break through the size limitations of micro-nano processing technology.Moreover,a memory consuming of waste heat will be considered energy efficient and business promising.Based on the major progress made by organic polymer materials in the application of electrical memory and optical memory techniques,this paper investigates the applications of organic polymer materials in thermal memory.The performances and regulation methods of phonon memory based on hydrogen-bonded supramolecular polymers are explored.The main research contents of this article are shown as follows:Firstly,the thermal conductivity test system with the differential-bridge method was set up and the suspended micro-device suitable for polymer fiber testing was designed and prepared.The temperature and dynamic characteristics of the system were calibrated by Pt1000 thermal resistance and single copper nanowire(CuNW),respectively.Firstly,the conductivity of a single CuNW was measured at room temperature,and the thermal conductivity of CuNW with a diameter of 338 nm was theoretically calculated to be around 10.2 Wm-1K-1 based on the Wiedemann-Franz law.The thermal conductivity of a single CuNW with a diameter of 320 nm was then measured utilizing the test system to be roughly 11.9 Wm-1K-1 at room temperature.The two results are consistent,which verifies the accuracy and reliability of the test system.Secondly,a phonon memory was designed based on a hydrogen-bonded supramolecular polymer of Melamine(M)and 6,7-dimethoxy-2,4[1H,3H]quinazolinedione(Q).The ability to control phonon transit by modulating hydrogen bonding has been proved experimentally.Through the experiments of variable temperature FTIR,rheological performance test,and variable temperature ultravioletvisible absorption spectroscopy,it is proved that MQ polymer has a reversible,hysteresis phase transition behavior.The thermal conductivity of MQ polymer fibers at different temperatures was measured by a differential thermal bridge test system,indicating that the thermal conductivity of MQ polymer fibers suddenly decreased from 0.25 Wm-1K-1 to 0.15 Wm-1K-1 in the temperature range of 297 to 307 K.However,the thermal conductivity recovered when cooling to 277～287 K,and the maximum difference in thermal conductivity hysteresis curve reached 66.7%.According to this characteristic,the MQ polymer phonon memory was demonstrated by multiple rise and cool cycles with an operating temperature of 295 K and a failure temperature of 360 K.Finally,the regulation method of thermodynamic properties of hydrogen-bonded supramolecular polymers was further explored based on three hydrogen-bonded supramolecular polymers with the same molecular formula and similar structure,and it was proved that the bonding strength of hydrogen bonds in polymers has a considerable impact on phonon transport.The three hydrogen-bonded supramolecular polymers were produced from three isomers of 2-hydroxybenzoic acid(s),3-hydroxybenzoic acid(m),and 4-hydroxybenzoic acid(p),synthesized with melamine.Experiments such as SEM,DSC,and variable temperature FTIR proved that three kinds of polymers all have thermally reversible,hysteresis phase transition behaviors,and the stability sorting of the hydrogen bond follows Mp>Ms>Mm.The thermal conductivities of the three kinds of polymer fibers were measured by the differential thermal bridge measurement methods,presenting that the greater the binding strength of the hydrogen bond,the higher the thermal conductivity.Finally,the molecular energies and binding energies of the three categories of polymers were analyzed by MM2 molecular force field.The calculated hydrogen bond stability relationship was consistent with the experimental results.