Synthesis and characterization of long chain semiaromatic polyamides based on undecanediamine

Abstract

Long chain semiaromatic polyamides with high molecular weight were synthesized by the reactions of undecanediamine with various aromatic diacids, and characterized by fourier transform infrared spectra (FT-IR) and nuclear magnetic resonance (1H-NMR). The thermal behaviors were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The solubility, dynamic mechanical, physical and mechanical properties of the polyamides were also investigated. The experimental results show that the polyamides with high molecular weights are obtained only the PH value of the polyamides salt are in the range of 7.2–7.4. The melting temperatures and the glass transition temperatures of the polyamides increase with the increase of the rigidity of aromatic diacids, and are near to those of poly(nonamethyleneterephthalamide) (PA9T).

Keywords

polyamide / undecanediamine / semiaromatic

References

[1] Sergei V.L., Edward D.W., Menachem L. Thermal Decomposi-tion of Aliphatic Nylons[J]. Polym. Int., 1999, 48(7): 532-557.

[2] Zhang G.Z., Yoshida H., Kawai T. Miscibility of Nylon 66 and Nylon 48 Blend Evaluated by Crystallization Dynamics[J]. Thermoc. Act., 2004, 416(1–2): 79-85.

[3] Khanna Y.P., Murthy N.S., Kuhn W.P., . Pseudo Super-miscibility: Blends of Semi-crystalline Nylon Pairs Exhibiting a Single T _g and a Single T _m[J]. Polym. Eng. Sci., 1999, 39(11): 2 222-2 232.

[4] Persyn O., Miri V., Lefebvre J.M., . Mechanical Behavior of Films of Miscible Polyamide 6/Polyamide 6I-6T Blends[J]. J. Polym. Sci. Part B: Polym. Phys., 2006, 44(12): 1 690-1 701.

[5] Endo M., Morishima Y., Yano S., . Miscibility in Binary Blends of Aromatic and Alicyclic Polyamides [J]. J. Appl. Polym. Sci., 2006, 101(6): 3 971-3 978.

[6] Rao Y., Waddon A.J., Farris R. Structure-property Relation in Poly(pphenylene terephthalamide) (PPTA) Fibers[J]. Polym., 2001, 42(13): 5 937-5 940.

[7] Kudo K., Suguie J., Hirami M. Melt-polymerized Aliphatic-aromatic Copolyamides. I. Melting Points of Nylon 66 Copolymerized with Aromatic Diamines and Terephthalic Acid[J]. J. Appl. Polym. Sci., 1992, 44(9): 1 625-1 629.

[8] Ahmed J.U., Ohkoshi Y., Gotoh Y. Melt Spinning and Laser-heated Drawing of a New Semiaromatic Polyamide, PA9-T fiber[J]. J. Polym. Sci. Part B: Polym. Phys., 2004, 42(3): 433-444.

[9] Morgan P.W., Kwolek S.L. Polymides from Phenylenediamines and Aliphatic Diacids [J]. Macromol., 1975, 8(2): 104-111.

[10] Jackson J.B. The Effect of Absorbed Water on the Dynamic Mechanical Parameters of Some Polyamides[J]. Polym., 1969, 10: 159-165.

[11] Li Y.J., Zhu X.Y., Tian G.H., . Multiple Melting Endotherms in Melt-crystallized Nylon 10,12[J]. Polym. Int., 2001, 50(6): 677-678.

[12] Ramesh C., Keller A., Eltink S.J. Studies on the Crystallization and Melting of Nylon 66:3. Melting Behaviour of Negative Spherulites by Calorimetry[J]. Polym., 1994, 35(24): 5 300-5 302.

[13] Li W.H., Yan D.Y. Synthesis and Characterization of Nylons based on Hexadecane Diacid[J]. J. Appl. Polym. Sci., 2003, 88(10): 2 462-2 467.

[14] Ma J.M., Song S.W., Guo J. New Heat Resistance Polyamide[J]. Mod. Plast. P. Ap., 2003, 15(2): 41-44.