Polyethylene glycol PEG combined with pharmaceutical polymers, successfully developed can stay in the human blood for 5h nanospheres, in addition to containing drugs and medical tracers, but also to eliminate the rejection of immune cells, the smooth delivery of drugs to specific focal areas, but also with the use of X-ray meters to observe the pathological conditions of capillaries.
Polyethylene glycol PEG as a substrate is not affected by melting point, does not weaken in summer, does not need refrigeration, the suppository of the substrate is less irritating than that of the traditional oil matrix, polyethylene glycol PEG as a suppository water-soluble substrate, in addition to children's ibuprofen suppository and clotrix suppository, in recent years, it has also been used in metanitrova vaginal suppository and indomexin suppository. The melting time and dissolution rate in vitro were better than glycerol gelatin and lanolin beeswax.
The poor heat resistance of polypropylene glycol PPG greatly limits its application in high temperature environment. Polypropylene glycol PPG can form good chemical bonding with materials containing active hydrogen, porous materials and materials with smooth surface, and has good wear resistance, water resistance, oil resistance, solvent resistance and ultra-low temperature resistance. Therefore, it is widely used in shoe making, packaging, plastic processing, automobile, construction, medical and health, low temperature environment, wood industry and other fields.
As the main material of the adhesive, studying the degradation process of PPG can better understand the degradation mechanism of the polymer, analyze the relationship between structure and performance, and seek effective methods to improve the heat resistance of the adhesive. Whether the material can meet the heat resistance requirements of engineering materials, PPG can also provide a basis for further research on improving the heat resistance of the material. The decomposition process of the polymer is not only affected by the properties of the sample, but also by the heat and oxygen in the surrounding environment.