Curing of Nomex/Phenolic and Kraft/Phenolic Honeycombs

Kim KS; Chin IJ; Sung IK; Min KS

Korea Polymer Journal, Vol.3, No.1, 35-40, April, 1995

Honeycombs with hexagonal cells were fabricated from Nomex and Kraft papers. Individual sheets were bonded together by a DGEBA epoxy system and then impregnated by phenolic resins. Curing behavior of epoxy and phenolic systems was measured by DSC and analyzed independently according to the method of Barrett and of Kissinger. Compressive strength and modulus of honeycombs increased with the core density. When the honeycombs were subject to laboratory aging, reduction in mechanical properties was more pronounced in Kraft/phenolic honeycomb than in Nomex/phenolic honeycomb.

[References]

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[1] Bitzer TN, "Encyclopedia of Polymer Science and Engineering," 2nd Ed., ed. by J.I. Kroschwitz, Vol. 7, pp. 746-756, John Wiley & Sons, New York (1986)

[2] Beukers A, 37th International SAMPE Symposium, 172 (1992)

[3] Kunio N, Tadashi H, European Patent, 0211 165 A1 (1987)

[4] Corden JL, Bitzer TN, 32nd International SAMPE Symposium, 63 (1987)

[5] Lin PY, European Patent, 0467 286 A1 (1992)

[6] Llorence S, 34th International SAMPE Symposium, 324 (1989)

[7] Wong R, 37th International SAMPE Symposium, 186 (1992)

[8] Barrett KEJ, J. Appl. Polym. Sci., 11, 1617 (1967)

[9] Prime PR, "Thermal Characterization of Polymeric Materials," Chap. 5, Academic Press, New York (1983)

[10] Riccardi CC, Adabbo HE, Williams RJJ, J. Appl. Polym. Sci., 29, 2481 (1984)

[11] Ozawa T, J. Thermal. Anal., 2, 301 (1970)

[12] Murray P, White J, Trans. Bir. Ceram. Soc., 54, 151 (1955)

[13] Kissinger HE, Anal. Chem., 29, 1702 (1957)

[14] Duffy JV, Hui E, Hartmann B, J. Appl. Polym. Sci., 33, 2959 (1987)

[15] "The Epoxy Resin Formulators Training Manual," Chap. I ~ III, Society of the Plastics Industry, Inc., New York (1984)

[16] Brydson JA, Plastics Materials, 5th Ed., Chap. 26, Mid-County Press, London (1989)