Properties of natural rubber vulcanizates containing mechanochemically devulcanized ground tire rubber
- 773 Downloads
The devulcanization of ground tire rubber (GTR) was carried out with a self-designed pan-mill type mechanochemical reactor. Gel fraction and crosslink density measurements confirmed the occurrence of stress induced mechanochemical devulcanization of GTR. The partially devulcanized GTR (dGTR) was blended with virgin natural rubber (NR) at different ratios. The curing characteristics and mechanical properties of these composites were investigated and compared with those composites of raw ground tire rubber (rGTR) and NR. The results showed that the tensile properties of the dGTR/NR vulcanizates were much better than those of the rGTR/NR vulcanizates, which are comparable to or even better than the virgin vulcanizate, indicating the significant benefit of mechanochemical devulcanization. At the GTR content of 10%, the tensile strength of the dGTR/NR blends increased to 23.2 MPa from 13.7 MPa of the rGTR/NR blends, enhanced by 69% through partial devulcanization of GTR, and the elongation at break increased by 47%.
KeywordsGround tire rubber Recycling Mechanochemical devulcanization Natural rubber Composites
The authors would like to thank National High Technology Research and Development Program (863 Program, 2008AA06Z343) for financial support, and thank Analytical and Testing Center of Sichuan University for providing SEM measurement facility.
- 10.Xu X, Wang Q, Kong XA, Zhang XD, Huang JG (1996) Plast Rubber Compos Process Appl 25:152–158Google Scholar
- 16.Zhao B, Lu CH, Liang M (2007) Chinese. Chem Lett 18:1353–1356Google Scholar
- 18.Flory PJ (1990) In: Principles of polymer chemistry. Cornell University Pres, Ithaca, NY, p 584Google Scholar
- 20.Tripathy AR, Morin JE, Williams DE, Eyles SJ, Farris RJ (2002) Macromolecules 36:4621Google Scholar