Reduction of Antidegradants in Vulcanized Rubber; Quantitative Analysis by Gas Chromatigraphy and Its Effect on Crack Resistance

Nam SH; Han MH

Korea Polymer Journal, Vol.6, No.4, 281-286, October, 1998

Nam SH, Han MH

Gas chromatography was successfully used to quantitatively determine the amount of antidegradants: 6PPD (N-1,3-dimethylbutyl-N''-phenyl-p-phenylendiamine) and TMDQ (2,2,4-trimethyl-1,2-dihydroquinoline) in a vulcanized rubber. Reduction of antidegradants in rubber by dynamic and static aging, fatigue aging, and heat aging was observed. Various effects such as aging time and temperature on the reduction of the antidegradants were also investigated. The decrease in the residual antidegradant was larger under dynamic condition than static aging, and the reduction of antidegradnat increased with increasing aging time and temperature. 6PPD showed relatively fast reduction than TMDQ. Among many factors affecting the reduction of antidegradants, heat was probably the most important factor to etermine the decrease in antidegradants. In terms of ozone crack resistance, the rubber compound in which the antidegradants had been reduced was far less efficient than that with the optimum antidegradant. After the dynamic and static aging, fatigue aging, and heat aging of rubber, the changed amounts of the two antidegradants in vulcanized rubber were measured by gas chromatography.

[References]

Barlow FW, Rubber Compounding, Marcel Dekker, New York (1988)
Lederer DA, Fath MA, Rubber Chem. Technol., 54, 415 (1980)
Layer RW, Lattimer RP, Rubber Chem. Technol., 63, 426 (1990)
Lattimer RP, Layer RW, Rhee CK, Rubber Chem. Technol., 57, 1023 (1984)
Cain ME, Gazeley KF, Gelling IR, Lewis PM, Rubber Chem. Technol., 45, 204 (1972)
Lattimer RP, Hooser ER, Layer RW, Rhee CK, Rubber Chem. Technol., 56, 431 (1984)
Lattimer RP, Hooser ER, Diem HE, Layer RW, Rhee CK, Rubber Chem. Technol., 56, 431 (1984)
Hilton CL, Rubber Age., 84, 263 (1958)
Burehfield HP, Judy JN, Anal. Chem., 19, 786 (1947)
Hilton CL, Anal. Chem., 32, 1554 (1960)
Wise RW, Sullivan AB, Rubber Chem. Technol., 35, 684 (1962)
Lewis JE, Deviney ML, Rubber Chem. Technol., 40, 1570 (1967)
Deviney ML, Whittington LE, Corman BG, Rubber World, Jan., 31 (1972)

[1] Barlow FW, Rubber Compounding, Marcel Dekker, New York (1988)

[2] Lederer DA, Fath MA, Rubber Chem. Technol., 54, 415 (1980)

[3] Layer RW, Lattimer RP, Rubber Chem. Technol., 63, 426 (1990)

[4] Lattimer RP, Layer RW, Rhee CK, Rubber Chem. Technol., 57, 1023 (1984)

[5] Cain ME, Gazeley KF, Gelling IR, Lewis PM, Rubber Chem. Technol., 45, 204 (1972)

[6] Lattimer RP, Hooser ER, Layer RW, Rhee CK, Rubber Chem. Technol., 56, 431 (1984)

[7] Lattimer RP, Hooser ER, Diem HE, Layer RW, Rhee CK, Rubber Chem. Technol., 56, 431 (1984)

[8] Hilton CL, Rubber Age., 84, 263 (1958)

[9] Burehfield HP, Judy JN, Anal. Chem., 19, 786 (1947)

[10] Hilton CL, Anal. Chem., 32, 1554 (1960)

[11] Wise RW, Sullivan AB, Rubber Chem. Technol., 35, 684 (1962)

[12] Lewis JE, Deviney ML, Rubber Chem. Technol., 40, 1570 (1967)

[13] Deviney ML, Whittington LE, Corman BG, Rubber World, Jan., 31 (1972)