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Abstract

Hyperbranched aromatic polyamides and copolymers were prepared by direct polycondensation in the presence of condensation agents. Three strategies were described: (1) self-polycondensation of AB _x -type monomers, (2) copolymerization of AB₂ and AB monomers and (3) polymerization of A₂ and B₃ monomers. The self-polycondensation of AB _x monomers proceeded without gelation to form soluble powdery polymers. The degree of branching of the hyperbranched polyamides was greatly influenced by the structure of the monomers. Copolymerization of AB₂ and AB monomers allowed control of the branching density of the resulting polymers. Spectroscopic measurements revealed that the copolymers were composed of five kinds of repeating units. The good solubility and adequate solution viscosity of the copolymers allowed the preparation of transparent yellow films by casting the copolymer solution onto a glass plate. The polymerization of A₂ and B₃ monomers was also investigated as a novel route to prepare hyperbranched polyamides without using AB _x -type monomers. Gelation during the polymerization could be avoided by the optimization of the reaction conditions. The structure and properties of the resulting polymers were compared with the hyperbranched polyamide prepared from the corresponding AB₂ monomer.

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References

[1] Kim Y H and Webster O W 1990 J. Am. Chem. Soc. 112 4592-4592

[2] Kim Y H and Webster O W 1992 Macromolecules 25 5561-5561

[3] Fréchet J M J 1994 Science 263 1710-1710

[4] Fréchet J M J , Hawker C J , Gitsov I and Leon J W 1996 J. Macromol. Sci. A 33 1399-1399

[5] Malmström E and Hult A 1997 J. Macromol. Sci. C 37 555-555

[6] Kim Y H 1998 J. Polym. Sci. A 36 1685-1685

[7] Hawker C J 1999 Adv. Polym. Sci. 147 113-113

[8] Voit B 2000 J. Polym. Sci. A 38 2505-2505

[9] Newkome G R , Moorefield C N and Vögtle F 1996 Dendritic Molecules: Concepts, Syntheses, Perspectives (New York: VCH)

10.

[10] Hawker C J , Lee R and Fréchet J M J 1991 J. Am. Chem. Soc. 113 4583-4583

11.

[11] Hölter D , Burgath A and Frey H 1997 Acta Polymer. 48 30-30

12.

[12] Miller T M and Neenan T X 1990 Chem. Mater. 2 346-346

13.

[13] Bayliff P M , Feast W J and Parker D 1992 Polym. Bull. 29 265-265

14.

[14] Backson S C E , Bayliff P M , Feast W J , Kenwright A M , Parker D and Richards R W 1994 Macromol. Symp. 77 1-1

15.

[15] Kim Y H 1992 J. Am. Chem. Soc. 114 4947-4947

16.

[16] Yang G , Jikei M and Kakimoto M 1998 Proc. Japan Acad. B 74 188-188

17.

[17] Yang G , Jikei M and Kakimoto M 1999 Macromolecules 32 2215-2215

18.

[18] Jikei M , Chon S-H , Kakimoto M , Kawauchi S , Imase T and Watanabe J 1999 Macromolecules 32 2061-2061

19.

[19] Ishida Y , Sun A C F , Jikei M and Kakimoto M 2000 Macromolecules 33 2832-2832

20.

[20] Jikei M , Fujii K , Yang G and Kakimoto M 2000 Macromolecules 33 6228-6228

21.

[21] Russo S , Boulares A and Mariani A 1998 Macromol. Symp. 128 13-13

22.

[22] Haba O , Tajima H , Ueda M and Nagahata R 1998 Chem. Lett. 333-333

23.

[23] Cosulich M E , Russo S , Pasquale S and Mariani A 2000 Polymer 41 4951-4951

24.

[24] Ishida Y , Jikei M and Kakimoto M 2000 Macromolecules 33 3202-3202

25.

[25] Yamazaki N , Matsumoto M and Higashi F 1975 J. Polym. Sci. A 13 1373-1373

26.

[26] Higashi F , Taguchi Y , Kokubo N and Ohta H 1981 J. Polym. Sci. A 19 2745-2745

27.

[27] Ueda M , Morosumi T , Kakuta M and Sato R 1990 Polym. J. 22 733-733

28.

[28] Frey H and Hölter D 1999 Acta Polymer. 50 67-67

29.

[29] Kricheldorf H R , Stöber O S and Lübbers D 1995 Macromol. Chem. Phys. 196 3549-3549

30.

[30] Kricheldorf H R and Stukenbrock T 1998 J. Polym. Sci. A 36 2347-2347

Hyperbranched Aromatic Polyamides Prepared by Direct Polycondensation

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