Microscope Instrument Micro Observation Technology in the Cotton Textile Industry
Fiber structure identification method:
(1) X-ray and Electron Diffraction - The difference in diffraction images obtained by irradiating different fibers with X-rays can be used to identify various types of fibers
(2) Infrared spectroscopy (Infre red) - uses the characteristics and chemical groups of various fibers to identify fibers in infrared spectroscopy
(3) Ultraviolet, Fluorescence - Fluorescent X-rays emitted by different elements have different wavelengths, and are then analyzed using spectroscopy
(4) Nuclear magnetic resonance (NMR) - refers to the resonance transition phenomenon between the magnetic energy levels of atomic nuclei with non zero spin or angular momentum in a constant external magnetic field, where the nuclear magnetic moment can be quantized in various directions. Under the action of electromagnetic waves at another given frequency, the resonance transition phenomenon occurs between the magnetic energy levels of atomic nuclei, which can analyze the order of atomic clusters or atomic arrangements within molecules and the properties of chemical bonds.
(5) Other methods include Raman spectroscopy, surface analysis, and various electron microscopy techniques.
The fiber structure can also be inferred from its physical and chemical properties, using the following method:
(a) Thermal analysis method, dynamic and fracture mechanics method: It is a technology that measures the physical properties of a substance and its temperature relationship under process control temperature. In the field of chemical fibers, there are many commonly used methods, such as thermogravimetry (TG) and escape gas analysis (EGA) for testing quality changes, differential thermal analysis (DTA) for testing temperature changes, and differential scanning calorimetry (DSC) for testing heat content changes, There are thermal expansion methods for testing dimensional changes, thermal mechanical analysis (TMA) and dynamic mechanical analysis (DTMA) for testing mechanical properties, and thermal optical methods for testing optical properties.
(b) Mass spectrometry: An analytical method in which a sample is ionized to form a mass spectrometry.
It can measure the molecular weight and structural mode of organic matter, as well as identify the organic matter and its structure. Spectral lines with different intensities can be obtained through ion sensitive plates, known as mass spectra. Based on the mass spectra, the molecular weight and structural mode of the substance can be determined.
