Polypeptide ester ether amine random polymer and preparation method and application thereof

A polypeptide ester ether amine random polymer, having the following general structural formula:

• wherein R1 and R2 are independently selected from any one of hydrogen, a C1-C12 saturated aliphatic hydrocarbon group, a C1-C12 unsaturated aliphatic hydrocarbon group, an aromatic hydrocarbon group, an alkyl ether group, hydroxyalkyl, hydroxy-protected C1-C6 hydroxyalkyl, hydroxy-protected hydroxyphenylmethyl, an alkyl thioether group, alkyl indolyl, carboxy-protected C1-C6 carboxyalkyl, and amino-protected C1-C6 aminoalkyl;
• or R1 and R2 together form any one of tetrahydropyrrole and hydroxytetrahydropyrrole with a hydroxy-protected substituent;
• R3 and R4 are independently selected from any one of hydrogen, a C1-C9 saturated aliphatic hydrocarbon group, and a C1-C9 unsaturated aliphatic hydrocarbon group;
• or R3 and R4 together form one of cyclohexane and cyclohexane substituted with methyl, ethyl, or vinyl;
• and x is selected from 0.30-0.99, and n is selected from 10-500.