1. Isoacrylate PEG products (ACLT)
Isoacrylate PEG (PEG-ACLT) products are very sensitive to light and high temperature. Exposure to light causes chain scission and possibly free radical-initiated polymerization. High temperatures can cause discoloration and crosslinking of the product. Oxygen in the air causes oxidation and polymerization of the product. Product degradation may occur in alkaline environments and in humid conditions.
2. PEG-ALD products
PEG-ALD products are very sensitive to alkaline environments and oxygen. In alkaline environments, condensation reactions may result in cross-linking impurities. Oxygen in the atmosphere may oxidize the ALD group resulting in inactivation of PEG-ALD.
3. PEG-MAL products
PEG-MAL products are very sensitive to light and high temperature. Light can cause chain scission and possibly free radical-initiated polymerization. High temperatures can cause product instability and crosslinking. Oxygen in the air causes oxidation and polymerization of the product. Product degradation may occur in alkaline environments and in humid conditions.
4. PEG-SH products
PEG-SH products are very sensitive to alkaline environments and oxygen. Disulfide bonds are readily formed in alkaline environments and under oxygen conditions. Oxygen in the air can cause product oxidation and polymerization. High temperatures can discolor the product and cause the product to crosslink.
5. PEG-NHS products
PEG-SH products are very sensitive to alkaline environments and oxygen. Disulfide bonds are readily formed in alkaline environments and under oxygen conditions. Oxygen in the air can cause product oxidation and polymerization. High temperatures can discolor the product and cause the product to crosslink.
6. PEG products of isocyanates (NCO)
Isocyanate (NCO) PEG products have high chemical activity, and should avoid contact with water (moisture), alcohol, amine and other substances containing active hydrogen. When this product comes into contact with water, it will generate carbonate; when this product contacts with amine, it forms urea; when this product contacts with alcohol reagent, it generates carbamate. It should be sealed with inert gas and stored in a dry place at low temperature to prevent deterioration. It is strongly recommended to use it once after opening.
