Effect of Curing Temperature on Degree Imidization of Melamine-BPADA Hyperbranched Polyimide Studied by FT-IR

Abstract:

We has synthesized hyperbranched polyamides (HPI) series containing s-triazine rings derived from melamine in the main chain, according to A3 + B2 approach which involving the emulsion polymerization reactions of melamine in hydrochloric acid and stepwise thermal imidization. The effect of curing temperature on the degree of imidization (DI) films of Melamine-BPADA (4,4'-(4,4'-Isopropylidenediphenoxy) bis (phthalic anhydride) has been examined by using the techniques of FTIR (Fourier transform infrared) and SEM-EDX (Scanning Electron Microscope-Electron Diffaction X-Ray). The DI varied significantly with annealing temperature before the films were fully cured. The Melamine-BPADA film was nearly fully cured when annealed at 180 °C, while the same was revealed for SEM-EDX. The morphology of the Melamine-BPADA film did not vary with annealing at temperatures and the FTIR experiment fairly match those from the SEM-EDX.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 251-255
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.251
• Online since: April 2015
• Authors: Muhammad Bisyrul Hafi Othman, Hazizan Md. Akil*, Hasnah Osman, Zulkifli Ahmad
• Keywords: Degree of Imidization, Hyperbranched Polyimide (HPI), Thermal Curing

References

[1] Liou, G. -S., et al., Highly flexible and optical transparent 6F-PI/TiO2 optical hybrid films with tunable refractive index and excellent thermal stability. Journal of Materials Chemistry, 2010. 20(3): pp.531-536.

DOI: 10.1039/b916758g

[2] Othman, M.B.H., et al., Dielectric constant and refractive index of poly (siloxane–imide) block copolymer. Materials & Design, 2011. 32(6): pp.3173-3182.

DOI: 10.1016/j.matdes.2011.02.048

[3] Chang, C. -W., et al., Novel organosoluble aromatic polyimides bearing pendant methoxy-substituted triphenylamine moieties: Synthesis, electrochromic, and gas separation properties. Journal of Polymer Science Part A: Polymer Chemistry, 2008. 46(24): pp.7937-7949.

DOI: 10.1002/pola.23082

[4] Akhter, T., et al., Synthesis and characterization of novel coatable polyimide-silica nanocomposites. Journal of Polymer Research, 2013. 21(1): pp.1-11.

[5] Chen, Y., et al., Synthesis and properties of hyperbranched polyimides from A2+ B'B2 monomers and A2+ B'B2 + B2 monomers with various comonomer ratios. Journal of Polymer Research, 2012. 19(4): pp.1-6.

DOI: 10.1007/s10965-012-9858-9

[6] Kim, Y.H., Hyperbranched polymers 10 years after. Journal of Polymer Science Part A Polymer Chemistry, 1998. 36(11): pp.1685-1698.

DOI: 10.1002/(sici)1099-0518(199808)36:11<1685::aid-pola1>3.0.co;2-r

[7] Jikei, M. and M. -a. Kakimoto, Dendritic aromatic polyamides and polyimides. Journal of Polymer Science Part A: Polymer Chemistry, 2004. 42(6): pp.1293-1309.

DOI: 10.1002/pola.20018

[8] Irwin, P.C., et al. Thermal and mechanical properties of polyimide nanocomposites. in Electrical Insulation and Dielectric Phenomena, 2003. Annual Report. Conference on. (2003).

DOI: 10.1109/ceidp.2003.1254809

[9] Jou, J.H. and P.T. Huang, Effect of thermal curing on the structures and properties of aromatic polyimide films. Macromolecules, 1991. 24(13): pp.3796-3803.

DOI: 10.1021/ma00013a009

[10] Georgieva, A., et al., Preparation of Polyimide Thin Films by Vapour Deposition and Solid State Reactions.

[11] Niyogi, S., S. Maiti, and B. Adhikari, Cyclodehydration of Poly (amic acid) to Polyimide. International Journal of Polymeric Materials, 2001. 49(3): pp.323-330.

DOI: 10.1080/00914030108039783

[12] Sacher, E., A reexamination of polyimide formation. Journal of Macromolecular Science—Physics, 1986. 25(4): pp.405-418.