An SMC (Sheeting Moulding Compound) of Ðbre-glass and orthophthalic polyester has been pyrolysed in a 3É5 dm3 autoclave for 30 min in a nitrogen atmosphere at 300, 400, 500, 600 and 700¡C. Gas yields of 8È13 weight%, liquid yields of 9È16 weight% and solid residues of 72È82 weight% were obtained. The suitability of the pyrolysis process for recycling SMC is discussed. The characteristics, compositions and possible ways of reusing the liquid and gaseous fractions are presented. The solid pyrolysis residue has been recycled in another thermoset composite (Bulk Moulding Compound, BMC) and its mechanical properties have been compared with those of virgin BMC. The main conclusion is that pyrolysis can be an appropriate method for recycling thermoset polymeric composites such as SMC. The pyrolysis gas fraction can be sufficient to provide the energy requirements of the process plant. The pyrolysis liquids have high gross caloriÐc values (36É8 MJ kg~1) and are non-polluting liquid fuels ; about 40 weight% of such liquids could be used as petrols, and the remaining 60% could be mixed with fuel oils. The solid pyrolysis residue can be recycled in BMC with no detrimental e †ect on the BMC mechanical properties. Concerning temperature, it has been concluded that 400È500¡C are the most suitable temperatures for recycling SMC by pyrolysis.
ABSTRACT:The curing behavior of a phenolic resol resin in the presence of p-toluensulphonic acid is reported herein. The gel time of different systems has been determined by thermal scanning rheometry. Thermal and mechanical properties of the resin have been modified by the addition of varying amounts of fillers, talc, and kaolin. dynamic mechanical thermal analysis is used to determine the mechanical properties of the systems and the influence of the fillers and the postcuring.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.