Influence of Reaction Volume on the Properties of Natural Rubber-g-Methyl Methacrylate

Abstract

Graft copolymer of natural rubber and poly(methyl methacrylate) was prepared using CHP/TEPA redox initiators at 50°C and a reaction time of 3 h. Various reaction volumes (i.e., 0.5, 100, and 200 L) were used to prepare the graft copolymer which was then characterized by Fourier transform infrared spectrophotometer and proton nuclear magnetic resonance spectrophotometer (¹H-NMR) techniques. It was found that conversion of monomer to polymer and grafting efficiency slightly decreased with increasing reaction volumes. Quantity of grafted poly(methyl methacrylate) was calculated based on the integrated peak areas of the ¹H-NMR spectra and quantitative analysis by extraction method. It was found that both techniques gave similar level of the grafted poly(methyl methacrylate) onto the natural rubber backbone. Furthermore, Mooney viscosities, glass transition temperature (T_g) and degradation temperature (T_d) of the natural rubber and poly(methyl methacrylate) were slightly decreased with increasing the reaction volumes.

Keywords

natural rubber poly(methyl methacrylate)graft copolymer reaction volume thermal properties.

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References

Brydson, J.A. ( 1994). Rubber Materials and their Compounds, London: Elsevier Science.

Olivaira, P.C. , Olivaira, A.M. and Garcia, A. (2005). Modification of Natural Rubber: A Study by 1H-NMR to Assess the Degree of Graftiziation of PolyDMAEMA or PolyMMA onto Rubber Particles under Latex form in the Presence of a Redox Couple Initiator, Euro. Polym. J., 4: 1883-1892.

Roberts, A.D. ( 1990). Natural Rubber Science and Technology, New York: Oxford University Press.

Zhou, M.H. , Hoang, T. , Kim, I.G. , Ha, C.S. and Cho, W.J. ( 2000). Synthesis and Properties of Natural Rubber Modified with Stearyl Methacrylate and Divinylbenzene by Graft Polymerization, J. Appl. Polym. Sci., 79: 2464-2470.

Arayapranee, W. and Rempel, L. (2008). Morphology and Mechanical Properties of Natural Rubber and Styrene-grafted Natural Rubber Latex Compounds , J. Polym. Sci., 109: 1395-1402.

Derouet, D. , Tran, Q.N. and Leblanc, J.L. ( 2009). Physical and Mechanical Properties of Poly(methyl methacrylate)-grafted Natural Rubber Synthesized by Methyl Methacrylate Photopolymerization Initiated by N,N-Diethyldithiocarbamate Functions Previously Created on Natural Rubber Chains, J. Polym. Sci., 112: 788-799.

Kawahara, S. , Kawazura, T. , Sawada, T. and Isono, Y. ( 2003). Preparation and Characterization of Natural Rubber Dispersed in Nano-matrix, Polymer, 44: 4527-4531.

Nampitch, T. and Vatanatham, T. ( 2005). Kinetic Studies of Styrene-NR Emulsion Copolymerization with High Rubber Content, J. Engine. Technol., 2: 88-103.

Okieimen, F.E. and Urhoghide, I.N. (1996). Studies on Miscibility of Poly(Vinyl Chloride) with Natural Rubber-graft-Polyacrylonitrile and Natural Rubber-graft-Poly(Methyl Methacrylate), J. Appl. Polym. Sci. , 59: 1803-1808.

10.

Oliverira, P.O. , Gumimaraes, A. , Cavaille, J.Y. , Chazeau, L. , Gilbert, R.G. and Santos, A.M. (2005). Poly(Dimethylaminoethyl Methacrylate) Grafted Natural Rubber from Seeded Emulsion Polymerization, Polymer, 46: 1105-1111.

11.

Enyiegbulam, M.E. and Aloka, I.U. (1992). Graft Characteristic and Solution Properties of Natural Rubber-g-Methyl Methacrylate Copolymer in MEK/Toluene, J. Appl. Polym. Sci., 44: 1841-1845.

12.

Thiraphattraphun, L. , Kiatkamjornwong , S. , Prasasrakich, P. and Damronglerd, S.J. (2001). Natural Rubber-g-Methyl Methacrylate/ Poly(Methyl Methacrylate) Blends, J. Appl. Polym. Sci., 81: 428-439.

13.

Oommen, Z. , Groeninckx, G. and Thomas, S. ( 2000). Melt Rheological Behaviour of Natural Rubber/Poly(Methyl Methacrylate)/Natural Rubber-g-Poly(Methyl Methacrylate) Blends, J. Polym. Sci. Part B; Polym. Phy., 38: 525-536.

14.

Lehrie, R.S. and Willis, S.L. (1997). Modification of Natural Rubber: A Study to Assess the Effect of Vinyl Acetate on the Efficiency of Grafting Methyl Methacrylate on Rubber in Latex Form, in the Presence of Azo-bisisobutyronitrile , Polymer, 38: 5937-5946.

15.

Lee, D.Y. , Subramanium, N. , Fellows, C.M. and Gilbert, R.G. (2002). Structure-Property Relationships in Modified Natural Rubber Latexs Grafted with Methyl Methacrylate and Vinyl Neo-Decanoate, J. Polym. Sci. Part A: Polym. Chem. , 40: 809-822.

16.

Nakason, C. , Pechurai, W. , Sahakaro, K. and Kaesaman, A. (2006). Rheological, Thermal, and Curing Properties of Natural Rubber-g-Poly(Methyl Methacrylate), J. Appl. Polym. Sci., 99: 1600-1614.

17.

Kochthongrasamee, T. , Prasasrakich, P. and Kiatkamjornwong , S. (2006). Effect of Redox Initiator on Graft Copolymer of Methyl Methacrylate onto Natural Rubber, J. Appl. Polym. Sci., 101: 2587-2610.