monomers totally accounting for u00bc of the total weight of the reaction system were charged into the reactor as well and the molar percentages m n x y z for each repeating units were 75 23 5 0 5 0 5 0 5 in succession the mixture was stirred until complete dissolution and a ph adjusting agent was then added in to adjust the reaction solution to have a ph value of about 8 then nitrogen gas was introduced in for 30 minutes to remove oxygen contained therein an initiator was added into the reactor under the protection of nitrogen gas and nitrogen gas was further continued for 10 minutes then the reactor was sealed the reaction was conducted at a temperature of 50 u00b0 c after 2 5 hours the reaction was ended with a complete conversion after the drying of the obtained product powdered amphiphilic macromolecule was obtained the molecular weight of the amphiphilic macromolecule was 430 u00d7 10 4 the synthesis of the amphiphilic macromolecule of this example was as follows firstly water accounting for u00be of the total weight of the reaction system was charged into a reactor then various monomers totally accounting for u00bc of the total weight of the reaction system were charged into the reactor as well and the molar percentages m n x y z for each repeating units were 74 23 0 5 1 5.