31 results about "Relaxation behavior" patented technology

The invention discloses a dysprosium complex constructed by taking an 8-hydroxyquinoline hydrazone derivative as well as a synthesis method and application of the dysprosium complex. The chemical formula of the complex is [Dy(HL)(L)], wherein L is a 2-formyl-8-hydroxyquinoline-2-chloro-benzoyl hydrazinedehydroxylation hydrogen atom and a hydrogen atom on acylhydrazone carbon and carries two units of negative charges; HL is a 2-formyl-8-hydroxyquinoline-2-chloro-benzoyl hydrazinedehydroxylation hydrogen atom and carries one unit of negative charge. The synthesis method of the complex comprises the following steps: dissolving Dy(NO3)3.6H2O2 and 2-formyl-8-hydroxyquinoline-2-chloro-benzoyl hydrazine with a mixed solvent; adjusting the pH value of obtained solution to 7.9-8.5, performing a reaction on the obtained mixed liquor under a heating condition, cooling a reactant and separating crystals, so as to obtain the dysprosium complex. The complex provided by the invention has a field-inducedslow relaxation behavior under low temperature and can be used for preparing a magnetic material.

The invention relates to a preparation method of a nylon CS blended membrane with high tensile strength. In the application of the method, subsequent treatment is not required for the surface of nylone and chitosan, and a solubilizer is not added into a blend; an alternating electric field is exerted during the process of the inversion from phase to membrane; when the alternating electric field is exerted on the chitosan-formic acid-nylon system, phase separation between CS and PA begins as volatilization of solvent continues; different dielectric properties of PA and CS enable the electric field to form electrostatic stress at the phase interface; synergy between the electrostatic stress and interfacial tension can induce micro-phase mixing between macromolecular chains at the interface; through adjusting electric field intensity and alternating current frequency parameter, the characteristic of the response of dipole orientation to the electric field environment is combined to adjust the intensity and direction of the electrostatic stress and the relaxation behavior of chain segments at the interface, thereby intensifying the micro-phase mixing effect at the interface. Therefore, the compatibility and tensile property of the blend are improved. The entire preparation process is low in cost, clean and highly efficient.

The present invention relates to a characterization method for the deformation and relaxation of thermoplastic elastomer. The compression, deformation and relaxation behavior of plastics modificationthermoplastic elastomer material are measured, i.e. a sample is placed in a compressor to be compressed for a certain time at normal temperature; after pressure is removed, tracking measurement is carried out to the deformation and relaxation conditions of the tested material; by analyzing and fitting a large amount of obtained experimental data, a mathematical model for the deformation and relaxation of the thermoplastic elastomer is built. The model can accurately describe the molecular chain relaxation behavior of thermoplastic elastomer and plastics modification thermoplastic elastomer material.

The invention discloses a prediction method for residual stress and damage caused by stress relaxation of a high-temperature material. The predication method mainly comprises the following steps: based on two creep deformation damage models and a stress relaxation strain model, establishing a corresponding stress relaxation continuous damage model; acquiring the material creep deformation performance data of a high-temperature component material at a temperature; based on the creep deformation performance data, fitting out corresponding material constants corresponding to the two creep deformation damage models; and by employing a data analysis technology and through program calculation, solving the stress relaxation continuous damage model, and finally converting the creep deformation data into stress relaxation data, so as to obtain a stress relaxation curve and a stress relaxation damage cure, and further to predict the residual stress and the damage degree caused by the stress relaxation of the high-temperature material. According to the method, the precise association of obtaining the relaxation behavior from the creep deformation data is established, and the complete prediction method for residual stress and damage caused by stress relaxation of the high-temperature is established, and a new approach is provided for stress relaxation strength design and management maintenance of high-temperature components.

The invention discloses a method for analyzing relaxation behaviors of a polymer chain section at a glassy state. The method comprises the following steps: (1) marking fluorescence molecules on a polymer at the glassy state or doping the fluorescence molecules into the polymer at the glassy state to prepare a polymer thin film sample, and carrying out annealing treatment; (2) observing the rotation of the fluorescence molecules in the polymer thin film sample, and photographing a defocusing video; (3) obtaining rotation tracks of the plurality of fluorescence molecules in the defocusing video; (4) carrying out rapid Fourier transform on the rotation tracks of the fluorescence molecules to obtain frequency distribution of a vibration mode in the rotation track of each fluorescence molecule, namely a frequency spectrum of each fluorescence molecule; and taking the average frequency spectrum of all the fluorescence molecules to analyze the relaxation behaviors of the polymer chain section at the glassy state. The method disclosed by the invention takes the advantages of a single-molecule fluorescence method, expands a research range and extends a cold state to the glassy state; and the relaxation behaviors of the chain section of a polymer system at the glassy state are effectively analyzed.

The invention discloses a method for preparing a high-performance and multifunctional shape memory material, comprising the following steps: S1, preparing a composite material; S2, performing multiple shape memory cycles on the composite material so as to realize the crystal structure and amorphous state of the composite material Regulate the relaxation behavior of the sub-segment of the region; S3, carry out the pre-stretching-recovery process on the composite material; S4, control the temperature and the magnitude of the strain in the pre-stretching-recovery process of the composite material; S5, through the pre-stretching The stretch-recovery process induces a crystal change in the composite. The present invention does not need to change the structural characteristics such as the composition and phase morphology of the material through external control means, and it utilizes the coupling effect of temperature and stress field in the implementation process to regulate the structure (crystalline region and amorphous region) of the composite material, thereby The improvement of shape memory performance and the expansion of other functional characteristics make composite materials have higher application value.

The invention discloses a method for monitoring the degree of polarization orientation and the relaxation behavior of the polymer with ferroelectric nanocrystalline. The method comprises the following steps: using a spectrophotometer to detect the transmission spectra change situation over time of the polymer film with ferroelectric nanocrystalline under different temperatures, generating a variation curve; measuring the transmission change before and after polarization of the composite polymer film with ferroelectric nanocrystalline in visible wavelength range to calculate the corresponding degree of polarization orientation, measuring the variation curve of the transmission change over time of the polarized polymer composite film in visible wavelength range to obtain the relaxation behavior of the polarization orientation and learn the stability of the polarization orientation. The method of the invention adopts the commercial visible-ultraviolet spectrophotometer as the detecting instrument, the method is simple, the monitoring cost is low, and the data are in good fit.

The invention discloses a bifunctional molecular magnet material, whose structural formula is [Co(4‑Cl‑PH‑terpy)2][Dy3(p‑NO2‑PHCOO)14], wherein Dy is a rare earth metal dysprosium ion, and Co is Transition metal ion, p‑NO2‑PHCOO is p-nitrobenzoic acid anion, 4‑Cl‑PH‑terpy is 4‑(4‑chlorophenyl)‑terpyridine. It integrates two functions of slow relaxation and spin conversion, composed of cobalt dichloride hexahydrate (CoCl2•6H2O), 4'‑(4‑chlorophenyl)‑2,2':6',2'' ‑Terpyridine, dysprosium trioxide (Dy2O3), p-nitrobenzoic acid and other raw materials are synthesized. The bifunctional molecular magnet prepared by the method of the present invention not only retains the good slow relaxation behavior of dysprosium (Dy), but also realizes the high-low spin conversion of cobalt (Co). This type of bifunctional molecular magnet material is unprecedented at home and abroad of.