Method for providing a side-chain dendrimer vesicle
A method disclosed for making a side-chain dendrimer vesicle. The method includes the steps of: At first, there is provided a random copolymer with a narrow distribution of molecular weights by active polymerization and chemical modification. Then, chemical modification is executed to graft various generations of dendrimers to the random copolymer to provide a side-chain dendritic random copolymer with various generations. Two steps of emulsification are taken to induce macromolecular self-assembling of the side-chain dendritic random copolymer solution to form the macromolecular vesicle. The side-chain dendrimer includes C 10 ˜C 18 hydrophobic alkyl chains.
1. A method for making a side-chain dendrimer vesicle including the steps of:
providing a random copolymer with a narrow distribution of molecular weights by active polymerization and chemical modification;
executing chemical modification to graft various generations of dendrimers to the random copolymer to provide a side-chain dendritic random copolymer with various generations; and
taking two steps of emulsification to cause macromolecular self-assembling of the side-chain dendritic random copolymer solution to form a macromolecular vesicle, wherein the side-chain dendrimer includes a hydrophobic alkyl chain being C 18 H 37 —, wherein the structural formula of the side-chain dendritic random copolymer with various generations is as follows:
wherein R represents one of the generations of dendrimers including [G-0.5]-C18, [G-1.5]-C18 and [G-2.5]-C18 and wherein the m to n ratio is 1:4 and wherein the molecular weights are between about 15000 and about 80000 daltons.
2. The method according to claim 1 , wherein the dendrimers synthesis of the side-chain dendrimer is based on a reaction of a primary amine group with an azetidine-2,4-dione functional group of the dendrimer, thus providing styrene random copolymers including grafted dendrimers as side chains.
3. The method according to claim 2 , wherein the styrene random copolymer is r-PS_PVBAm and is dissolved in DMSO before a dendrimer is added to the solution and nitrogen is introduced to the solution for reaction wherein the azetidine-2,4-diones of the dendrimers react only with aliphatic primary amines to form malamide linkages at 70° C. and wherein, after reaction, the solution is put in methanol and a precipitate of r-PS-PVBAm-R is obtained, wherein R represents one of the various generations of dendrimers.
4. The method according to claim 1 , wherein the compound with the side-chain dendritic random copolymer with various generations of dendrimers is dissolved in the solution before phosphoric acid buffer solution is added in the solution in a bath, and the solution is well stirred to provide a first phase of emulsified mixture, and the emulsified mixture is added in phosphoric acid buffer solution or de-ionized water and stirred at the room temperature to provide emulsification solution until all of the organic solvents are evaporated, and the resultant macromolecular vesicle suspension is filtered and concentrated.
5. The method according to claim 1 , wherein a polydispersities of the random copolymers are between about 1.1 and about 1.8.
6. A dendrimer vesicle made in the method according to claim 1 .