Cardanol is the main ingredient of cashew nut shell liquid (CNSL), an agro-byproduct. Its comparative merits for plasticizing silica-filled natural rubber (NR) is the subject of this paper. Aromatic oil is the conventional plasticizer employed for such compounding requirements. The mechanical properties, ageing behavior and torque time curves during cure of NR plasticized by both these materials are compared under identical conditions. It has been established that cardanol, when used as plasticizer, gives rise to similar mechanical properties in NR vulcanizate, shorter cure times and superior ageing behavior. The study also underlines the need for optimization of cardanol content for plasticization.
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References
1.
LubiMary C., and ThachilEby Thomas, Cashew nut shell liquid (CNSL) – a versatile monomer for polymer synthesis, Designed Monomers and Polymers, 3 (2000), 2, 123–153.
2.
Wassermann, and DawsonC. R., Ind. Eng. Chem., 37 (1945), 396.
3.
CarraherC. E., and SperlingL. H., Polymer Applications of Renewable Resource Materials, Plenum Press, New York (1981).
4.
RoyS. S., KunduA. K., and MaMailiS., J. Applied Polymer Sci., 36 (1988), 1283.
5.
ManjulaS., SudhaJ. D., BeraS. C., and PillaiC. K. S., J. Applied Polymer Sci., 30 (1985), 1767.
6.
DoTruong Thien, and NguyenVan KhoiComposite materials based on natural rubber and cardanol novolac resin, Tap Chi Hoa Hoc, 33 (1995), 3, 36–8.
7.
GhoshK., DasC. K., and BanerjeeS., Compounding of styrene–butadiene rubber with card-phenol in the presence of calcium carbonate, Polymer Communications, 25 (1984), 5, 152–4.
8.
GhostK., and BanerjeeS., Compounding of natural rubber with card-phenol in the presence of black filler (ISAF, N. 220) and different accelerator systems, Indian Journal of Technology, 13 (1975), 8, 362–6.
9.
SanghiL. K., BattacharjeeA. S., and BanerjeeS., Compounding nitrile rubber with card-phenol (Cardanol), Journal of the Institution of the Rubber Industry, 8 (1974), 5, 188–91, 196.
10.
MenonA. R. R., PillaiC. K. S., and NandoG.Modification of natural rubber with phosphatic plasticizers: a comparison of phosphorylated cashewnut shell liquid prepolymer with 2-ethyl hexyl phosphate, European Polymer Journal, 34 (1998), 7, 923–929.
11.
ThienDo Truong; Van KhoiNguyen, and KhangDo Quang, Modification of rubber by cardanol–formadehyde, Journal of Macromolecular Scienc e, Pure and Applied Chemistry, A33 (1996), 12, First International Polymer Symposium on Polymers from Natural Sources.
12.
VargheseLity Alen, and ThachilEby Thomas, Journal of Adhesion Science and Technology, 18 (2004), 2, 181–193.
13.
GowarikerV. R., ViswanathanN. V., and SreedharJayadev, Polymer Science, Wiley Eastern Limited, Delhi, India (1986).
14.
BlowC. M.Rubber Technology and Manufacture, 2nd Edition, Butterworth Scientific, London (1982).
15.
DurraniA. A., DavisG.L., SoodS. K., TychopoulusV., and TymanJ. H.P., J. Chem. Technol Biotechnol, 32618 (1982).
16.
HofmannWerner, Rubber Technology Hand Book, p 306, Hanser Publisher, New York (1989).
