Definition of plasticPlastic is a polymer compound made of monomer as raw material, polymerized by polyaddition or polycondensation reaction, with medium deformation resistance, between fiber and rubber, mainly composed of resin and additives such as fillers, plasticizers, stabilizers, lubricants, pigments, etc.
According to the molecular structure of plastics, it can be roughly divided into:
1. Polyolefin plastics, such as: LDPE, HDPE, LLDPE, PP, EEAEVA, PB-1, TPX;
2. Polystyrene plastics (it is also polyolefin plastics, because of many types, important, separate columns), such as: ps, hips, absaas, acs, mbs, as;
3. Vinyl plastics, such as PVC
4. Acrylic plastics, such as PMMA;
5. Nylon (polyamide), such as: transparent nylon, MC nylon, PA (666610), etc.;
6. Polyphenylene ether esters, such as: POM, PPO, NORYL, PPS, PSF, PC, PET, PBT, polyaryl esters, polyaryl sulfone;
7. Cellulose plastics, such as: CN, CA, CAP, CAB, EC, CEC, HEC;
8. Polyurethane, such as TPU.
According to the mechanical properties of plastics, it can be roughly divided into:
1. Materials with low comprehensive mechanical properties - general plastics PE, PP, EEA, EVA, PVC;
2. Materials with medium comprehensive mechanical properties - engineering plastics PS, HIPS, ABS, AAS, ACSMBS, AS, BS, PMMA;
3. Materials with high comprehensive mechanical properties - structural engineering plastics PA, POM, NORYL, PC, PET, PBTThe characteristics of the material itself determine what use it is suitable for, in fact, there is no strict distinction between general plastics and engineering plastics, as long as general engineering plastics meet the requirements of mechanical structure, they are also used in structure.
According to the structural properties, it can be divided into crystalline polymer and amorphous polymer
The crystallinity of crystalline polymers is affected by a variety of factors, such as crystallization temperature, cooling rate, and kernel density. Changes in crystallinity affect the properties of polymer materials, such as mechanical, thermal, density, and optical properties. The change of properties will affect the use and quality of polymer materials, so in industrial production, crystallinity is an important parameter to evaluate the production process of polymer materials, and it is necessary to have a more convenient and efficient way to monitor the crystallinity. At present, X-ray diffraction is a well-established method with well-defined instruments and a wide range of applications.
LANScientific X-ray diffractometer.