Influence of Kinds of Fatty Acids and Poly(ethylene glycol)s on Properties of Silica-Filled Natural Rubber Compounds

Sung-Seen Choi; Sungsoo Park

Korea Polymer Journal, Vol.9, No.2, 92-99, April, 2001

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Influence of Kinds of Fatty Acids and Poly(ethylene glycol)s on Properties of Silica-Filled Natural Rubber Compounds

Sung-Seen Choi^†, and Sungsoo Park

Kumho Research and Development Center, 555, Sochon-dong, Kwangsan-gu, Kwangju 506-711, Korea

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Silica-filled rubber compounds have slower cure characteristics than carbon black-filled ones due to the adsorption of curatives on the silica surface. Fatty acid was used as a cure activator along with zinc oxide in a sulfur cure system. Poly(ethylene glycol), PEG, was used in silica-filled rubber compounds to prevent adsorption of the curatives on the silica surface. In this study, influence of the size of fatty acid and PEG on properties of silica-filled NR compounds was investigated. It was found that the size of fatty acid and PEG affected the cure characteristics and physical properties. The cure rate becomes faster as the PEG size increases. By increasing the size of fatty acid or PEG, the delta torque of the compound decreases while the Mooney viscosity increases. The modulus of the vulcanizate decreases with increasing the molecular weight of fatty acid or PEG. The experimental results were explained by the filler dispersion and by the prevention of the curative-adsorption on the silica surface.

[References]

Coran AY, Rubber Chem. Technol., 37, 679 (1964)
Layer RW, Rubber Chem. Technol., 65, 211 (1992)
Krejsa MR, Koenig JL, Rubber Chem. Technol., 66, 376 (1993)
Byers JT, Rubber World, 219(2), 38 (1998)
Gorl U, Hunsche A, in Proceedings of the Rubber Division 150th Meeting, American Chemical Society, Paper No. 76 (1996)
Gorl U, Hunsche A, in Proceedings of the Rubber Division 151th Meeting, American Chemical Society, Paper No. 38 (1997)
Hashim AS, Azahari B, Ikeda Y, Kohjiya S, Rubber Chem. Technol., 71, 289 (1998)
Choi SS, Korea Polym. J., 7(4), 244 (1999)
Choi SS, J. Appl. Polym. Sci., 79(6), 1127 (2001)
Hess WM, Swor RA, Micek EJ, Rubber Chem. Technol., 57, 959 (1984)
Evans LR, Fultz WC, in Proceedings of the Rubber Division 151th Meeting, American Chemical Society, Paper No. 15 (1997)
Cochet P, Barruel P, Barriquand L, Grobert J, Bomal Y, Prat E, in Proceedings of the Rubber Division 144th Meeting, American Chemical Society, Paper No. 162 (1994)
Mandal SK, Datta RN, Basu DK, Rubber Chem. Technol., 62, 569 (1989)
Class JB, Grasso RP, Rubber Chem. Technol., 66, 605 (1993)
Yoon JR, Ikeda Y, Hashim AS, Kohjiya S, Rubber Chem. Technol., 68, 824 (1995)
Morrison NJ, Porter M, Rubber Chem. Technol., 57, 63 (1984)
Bhatnagar SK, Banerjee S, Rubber Chem. Technol., 38, 961 (1965)

[Referenced By]

[1] Coran AY, Rubber Chem. Technol., 37, 679 (1964)

[2] Layer RW, Rubber Chem. Technol., 65, 211 (1992)

[3] Krejsa MR, Koenig JL, Rubber Chem. Technol., 66, 376 (1993)

[4] Byers JT, Rubber World, 219(2), 38 (1998)

[5] Gorl U, Hunsche A, in Proceedings of the Rubber Division 150th Meeting, American Chemical Society, Paper No. 76 (1996)

[6] Gorl U, Hunsche A, in Proceedings of the Rubber Division 151th Meeting, American Chemical Society, Paper No. 38 (1997)

[7] Hashim AS, Azahari B, Ikeda Y, Kohjiya S, Rubber Chem. Technol., 71, 289 (1998)

[8] Choi SS, Korea Polym. J., 7(4), 244 (1999)

[9] Choi SS, J. Appl. Polym. Sci., 79(6), 1127 (2001)

[10] Hess WM, Swor RA, Micek EJ, Rubber Chem. Technol., 57, 959 (1984)

[11] Evans LR, Fultz WC, in Proceedings of the Rubber Division 151th Meeting, American Chemical Society, Paper No. 15 (1997)

[12] Cochet P, Barruel P, Barriquand L, Grobert J, Bomal Y, Prat E, in Proceedings of the Rubber Division 144th Meeting, American Chemical Society, Paper No. 162 (1994)

[13] Mandal SK, Datta RN, Basu DK, Rubber Chem. Technol., 62, 569 (1989)

[14] Class JB, Grasso RP, Rubber Chem. Technol., 66, 605 (1993)

[15] Yoon JR, Ikeda Y, Hashim AS, Kohjiya S, Rubber Chem. Technol., 68, 824 (1995)

[16] Morrison NJ, Porter M, Rubber Chem. Technol., 57, 63 (1984)

[17] Bhatnagar SK, Banerjee S, Rubber Chem. Technol., 38, 961 (1965)