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[Chemical Knowledge]：The Difference and Application of Polyethylene Glycol and PEG Polymer

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Polyethylene (PEG) and PEG polymer are two common chemical raw materials, which have a wide range of applications in different fields. Although they have some similarities, there are also some obvious differences. In this paper, we will compare the chemical structure, physical properties and application fields in order to better understand the characteristics and application value of polyethylene glycol and PEG polymers.

polyethylene glycol is a colorless, odorless, viscous liquid or solid, in the chemical structure is a series of hydrophilic polymers. PEG is a macromolecular compound obtained by polymerizing ethylene glycol (Ethylene Glycol), and its main structural feature is a polymer chain linked by oxygen atoms. The PEG polymer is a copolymer obtained by chemical reaction of polyethylene glycol with other substances, and according to different applications, PEG polymers with different molecular weights and characteristics can be prepared.

from the physical properties, polyethylene glycol has good solubility, soluble in water, ethanol and other solvents. The solubility and other properties of PEG polymers depend on the ratio of PEG to polyethylene glycol, molecular weight and other factors. The molecular weight of polyethylene glycol and PEG polymer can be adjusted according to actual needs to meet the application requirements of different fields.

in the application, polyethylene glycol has many advantages, such as low toxicity, good biocompatibility, high stability, is widely used in medicine, cosmetics, food and industrial fields. In the field of medicine, polyethylene glycol is often used as a carrier, solubilizer and protective agent of drugs, which can prolong the blood circulation time of drugs and improve the stability and bioavailability of drugs. PEG polymer is more diverse, according to its combination with other substances and different uses, can be prepared polyethylene glycol dimethyl acrylate, polyethylene glycol octanoate and other different functions of PEG polymer. In the field of genetic engineering and nanotechnology, PEG polymers are widely used in the encapsulation, surface modification and targeted delivery of nanoparticles.

In conclusion, although there are some similarities between polyethylene glycol and PEG polymers, there are obvious differences in chemical structure, physical properties and application fields. As an important chemical raw material and functional material, polyethylene glycol is widely used in medicine and chemical industry because of its excellent properties. PEG polymer is the product of continuous improvement and development on the basis of polyethylene glycol, which has more diversified structure and function, and provides important support for the development of nanotechnology and biomedicine. In the future, the research and application of polyethylene glycol and PEG polymers will be more in-depth, bringing more possibilities for human life and scientific and technological progress.

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