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Summary of the structure and characteristics of PEG.
| Types | Structures | Advantages | Disadvantages |
|---|---|---|---|
| Linear PEG |
|
Simple synthesis process, Excellent water solubility | Low drug loading |
| Four-arm PEG |
|
High drug loading, Multiple functional selectivities, Improve the solubility of drugs, Low critical micelle concentration | Easy internal crosslinking, Slow gelation speed |
| Six-arm PEG |
|
||
| Eight-arm PEG |
|
