[Chemical Knowledge]：PET detection methods and analysis techniques

PET detection method exploration

PET, or polyethylene terephthalate, is a common plastic material with excellent physical properties and chemical stability, so it is widely used in bottled beverages, food packaging, fiber and other fields. With the increasing concern about environmental pollution and health and safety, the detection and analysis technology of PET materials has been paid more and more attention.

Physical performance testing: physical performance testing is one of the important means to evaluate the quality of PET materials. Among them, the common test items include tensile properties, thermal properties, transparency, etc. Tensile property test evaluates the strength, ductility and other indicators of PET material through tensile test, so as to determine its durability in practical application. Thermal performance testing is mainly aimed at the thermal stability and thermal deformation temperature of PET materials to ensure that they do not deform or degrade in high temperature environments. Transparency is an important index to measure the quality of PET transparent packaging materials, and its detection methods mainly include light transmittance measurement, color difference measurement and so on.

Chemical composition analysis: The chemical composition analysis of PET materials is a key step to ensure their safety and reliability. Common chemical composition analysis methods include infrared spectroscopy (FTIR), nuclear magnetic resonance analysis (NMR) and so on. Infrared spectrum analysis by measuring the absorption characteristics of PET materials in the infrared band, identify its molecular structure and functional groups, so as to determine its quality and purity. Nuclear magnetic resonance analysis uses nuclear magnetic resonance technology for non-destructive testing of PET samples, accurate determination of its molecular structure and composition content, to provide a basis for product quality control.

Microstructural observation: Microstructural observation is an important means to understand the relationship between the properties and structure of PET materials. Commonly used observation methods include scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the like. Scanning electron microscopy can be used to observe the surface morphology and structure of PET materials with high resolution, and reveal the microscopic characteristics of surface defects and lattice structure. Transmission electron microscopy can deeply observe the internal structure of PET materials, understand its crystal morphology and distribution, and provide reference for material modification and process optimization.

Through the application of the above detection methods, we can fully understand the physical properties, chemical composition and microstructure of PET materials, and provide reliable technical support and guarantee for its application in various fields.

PET analysis technology application prospect

In addition to regular detection methods, in recent years, with the continuous progress and innovation of science and technology, some new analysis techniques have also been applied to the detection and analysis of PET materials, providing new possibilities for its performance improvement and application expansion.

Spectroscopy techniques: Spectroscopy techniques play an important role in the analysis of PET materials. Near infrared spectroscopy (NIR) technology is a non-destructive analysis method, which can quickly and accurately detect the chemical composition and performance parameters of PET materials, and provides convenient conditions for on-line monitoring in industrial production. Raman spectroscopy technology can quickly analyze the structure and composition of PET materials through molecular vibration and rotation information, and provide reference for material quality control and process optimization.

Intelligent analysis technology: With the development of artificial intelligence and big data technology, the application of intelligent analysis technology in PET material detection is gradually increasing. The intelligent analysis system based on machine learning and pattern recognition can mine the hidden rules and characteristics from a large amount of data, realize the rapid identification and classification of PET materials, and improve the detection efficiency and accuracy. Intelligent analysis technology can also realize real-time monitoring and intelligent control of the production process of PET materials, effectively reduce production costs and resource consumption, and promote the sustainable development of PET materials.

Nanotechnology applications: Nanotechnology has great potential in the modification and functionalization of PET materials. By introducing nanomaterials, such as nano