Methacrylamide grafted elastomer composites reinforced with biobased particles
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Modulus of rubber can be improved with grafting of unsaturated monomers. To increase the modulus of bio-based rubber composites, methacrylamide was grafted onto natural rubber composites reinforced with bio-based hydrophilic particles. Rubber particles in water were modified with methacrylamide using redox free radical initiator. Modified rubber composites have higher crosslinking density, bound rubber, and modulus than the unmodified rubber composites. Without methacrylamide, initiator modified rubber composites have poor tensile strength and elongation. The modified rubber has a greater stress relaxation rate than the unmodified rubber because of interactions between methacrylamide grafts. Relaxation behaviors of modified and unmodified rubber composites are similar because the effect of filler dominates the dissociation process. The rapid increase of reinforcement factors with filler content can be described by the modified Mooney equation. At small strain, the reinforcement factors for both modified and unmodified rubber composites indicate the association of poly(methacrylamide) grafts is the main contribution to the increase of modulus in the modified rubber composites.
KeywordsMethacrylamide Rubber composites Mechanical properties Rubber filler
The author thanks A. Thompson for conducting SEM imaging of rubber composites.
- 2.Fukushima Y, Kawahara S, Tanaka Y (1998) Synthesis of graft copolymers from highly deproteinised natural rubber. J Rubber Res 1:154–166Google Scholar
- 23.Greve H-H (2000). Rubber, 2. Natural. In Ullmann’s encyclopaedia of industrial chemistry. Wiley-VCH, WeinheimGoogle Scholar
- 24.Archer BL, Barnard D, Cockbain EG, Dickenson PB, McMullen AI (1963) Chapter 3, structure, composition and biochemistry of Hevea latex. In: Bateman L (ed) The chemistry and physics of rubber-like substances. MacLaren & Sons, LondonGoogle Scholar
- 28.Nallasamy P, Mohan S (2004) Vibrational spectra of cis-1,4-polyisoprene. Arab J Sci Eng 29:17–26Google Scholar
- 30.Barth A (2007) Infrared spectroscopy of proteins. Biocheim Biophys Acta 1767:1073–1101Google Scholar
- 33.Eng AH, tanaka Y, Gan SN (1992) FTIR studies on amino groups in purified Hevea rubber. J Nat Rubber Res 7:152–155Google Scholar
- 34.Haider KS (2012) Rubber soul - the investigation of rubber by vibrational spectroscopy. M. Sc. Thesis, Berlin University, Germany, 2012Google Scholar
- 36.Brandrup J, Immergut EH, Grulke EA (1999) Polymer Handbook4th edn. John Wiley & Sons, New YorkGoogle Scholar