A review of the major issues surrounding the postuse disposal of polymer composite materials is presented. Composites are compared to unreinforced plastics in terms of production volume and the technologies available for reprocessing. Not surprisingly, composites comprise a very small fraction of the plastics waste stream. In highvolume applications such as automobiles, however, there are reasons to be concerned about composites recycling. The fundamental categories of dealing with waste (burning, burying, reusing, or using less in the first place) are described in relation to plastics and composites. Reprocessing technologies with applications for composites are reviewed. For thermosetmatrix composites, processes involving regrinding waste materials and using them as filler for other polymer processes show promise. For thermoplasticmatrix composites, processes involving grinding and remolding by injection or compression molding are promising. Applications for recycled composites, without which reprocessing is futile, are also reviewed.
References
1.
1. Curlee, R. T. and S. Das. 1991. Plastic Wastes. Park Ridge, NJ: Noyes Data Corporation, pp. 15-30.
2.
2. Rathje, W. and C. Murphy. 1992. Rubbish!Harper Collins.
3.
3. Hegberg, B. A., G. R. Brenniman and W. H. Hallenbeck. 1992. Mixed Plastics Recycling Technologies, Park Ridge, NJ: Noyes Data Corporation, p. 11-11.
4.
4. Anon. 1991. "Plastics Makers Recycle for New Growth,"Chemicalweek (Dec. 18-25):28-38.
6. Palermo, J. 1992. "Recycling Phenolics,"Proceedings of the 8th Annual ASM/ESD Advanced Composites Conference, Chicago, IL, Nov. 2-5, pp. 253-260.
7.
7. Riess, R.1992. "The German Approach to Plastics Recycling,"Metals and Materials, 8(11):592-595.
8.
8. Anon. 1991. "Plastics Recycling Legislation Spread around the Globe,"Chemicalweek (Dec. 18-25):42-43.
9.
9. Nakazato, K., S. Inoue and T. Hamano. 1992. "Recycling Plans in Japan and the Operational Summary,"Proceedings of the 1992 National Waste Processing Conference, Detroit, MI, May 17-20, pp. 375-383.
10.
10. Eller, R.1992. "Solid Waste Management in Japan"Waste Age (May):53-64.
11.
11. 1991. Data received from the SPI Composites Institute.
12.
12. 1991. Data received from the SMC Automotive Alliance.
13.
13. 1991. Data received from Suppliers of Advanced Composite Materials Association.
14.
14. 1994. Data received from the SPI Composites Institute.
15.
15. 1994. Data received from the Automotive Composites Consortium.
16.
16. Curlee, R. T.1985. "Plastics Wastes and the Market Penetration of Auto Shredders,"Technol. Forecasting and Soc. Change, 28:29-42.
17.
17. 1990. Data received from Franklin Associates, Ltd., Prairie Village, Kansas City.
18.
18. Wood, S. A.1988. Modern Plastics (June):62-62.
19.
19. Ness, H.1984. In The Impacts of Material Substitution on the Recyclability of Automobiles, R. A. Blelloch, ed., New York: ASME, p. 39-39.
20.
20. Niemczewski, C. M. In Ref. [10], p. 22-22.
21.
21. Owens, A. D. 1993. "Techno-Economic Assessment of the Recycling of Composites Intensive Vehicles," Master's Thesis, University of Tulsa.
22.
22. Menges, G. et al. 1988. Kunstst. Ger. Plast., 78(7):7-7.
23.
23. Hnat, J. G. et al. 1992. "Recycling of Auto Shredder into Value Added Glass Products,"Proceed-ings of the 8th International Advanced Composites Conference, Chicago, November.
24.
24. Leidner, J.1981. Plastic Was I-Recovery of Economic Value. New York: Marcel Dekker, p. 22-22.
25.
25. Henshaw, J. M.1994. "Design for Recycling: New Paradigm or Just the Latest 'Design-for-X' Fad?"International Journal for Materials and Product Technology, 9(1/2/3):125-139.
26.
26. Norris, D. R.1990. Proceedings of ASM/ESD Advanced Composites Conference, 6:277-283.
27.
27. Graham, W. D. 1993. "SMC Composites Recycling,"Proceedings of the 9th Annual ASM/ESD Advanced Composites Conference, Detroit, MI, pp. 609-619.
28.
28. Farrissey, W. J.1992. "Thermosets,"Plastics Recycling: Products and Processes, R. J. Ehrig, ed., Hanser Publishers, pp. 231-262.
30. Farrissey, W. J.1991. Plastics Recycling: Status, Automotive Engineering, 99(5):25-25.
31.
31. Baumann, G. F., W. J. Farrissey and J. I. Myers. 1991. "Energy Recovery from Automotive RIM Parts,"Polyurethanes World Congress 1991: The Voice of Advancement, Nice, France, Sep. 24-26, pp. 355-360.
32.
32. Daniels, E. J., B. J. Jody and P. V. Bonsignore. 1992. 'Alternatives for Recycling of Auto Shred-der Residue,"J. of Resource Management and Technology, 20(1):14-25.
33.
33. Wood, S. A.1988. Modern Plastics (June):62-62.
34.
34. Bambrick, C., D. Babbington and D. Waszeciak. 1992. "Recycling Options for SRIM Compos-ites,"Advanced Composites: Design, Materials and Processing Technologies, ASM International, Chicago, IL, Nov. 2-5, pp. 231-237.
35.
35. Toensmeir, P. A. In Reference [7], p. 108.
36.
36. Jutte, R. B. and W. D. Graham. 1991. "Recycling SMC Scrap as a Reinforcement,"Plastics Engineering (May):13-16.
37.
37. Godlewski, R. and W. Herdle. 1992. "Recycling of Ground SMC into Polypropylene and Recovery of Scrap Azdel to Produce Quality Molded Parts,"Advanced Composites: Design, Materials and Processing Technologies, ASM International, Chicago, IL, Nov. 2-5, pp. 239-246.
38.
38. Henshaw, J. M., et al. 1994. "Recycling of a Cyclic Thermoplastic Composite Material by Injection and Compression Molding,"Journal of Thermoplastic Composite Materials, 7(January):14-30.
39.
39. Chu, J. and J. L. Sullivan. 1993. "Recyclability of a Fiber Reinforced Cyclic Polycarbonate Composite,"Ford Motor Company Scientific Research Laboratory Internal Report.
40.
40. Levenson, H.1989. "Facing America's Trash,"Washington, DC, Office of Technology Assess ment, p. 2-2.
41.
41. Nir, M. M.1990. Plastics Engineering (September):51-51.
42.
42. Lennon, B., V. M. Karbhari and H. Allen. 1993. "Performance Enhancement of Concrete Through the Use of Waste Injection Molding Pellets: A Preliminary Study of Viability,"Journal of Thermoplastic Composite Materials, 6(January):49-61.
43.
43. 1993. Private Communication with Phillips Recycling Company, a subsidiary of Phillips Petro leum Company (March).
