期刊
JOURNAL OF POLYMER SCIENCE
卷 -, 期 -, 页码 -出版社
WILEY
DOI: 10.1002/pol.20230724
关键词
bisphenol A; composites; polycarbonate; recycling; sulfur; thiocracking; upcycling
A method of chemically upcycling polycarbonate while dismantling endocrine-disrupting BPA units is reported, using elemental sulfur to produce structurally viable building materials.
Environmental damage caused by waste plastics and downstream chemical breakdown products is a modern crisis. Endocrine-disrupting bisphenol A (BPA), found in breakdown products of poly(bisphenol A carbonate) (PC), is an especially pernicious example that interferes with the reproduction and development of a wide range of organisms, including humans. Herein we report a single-stage thiocracking method to chemically upcycle polycarbonate using elemental sulfur, a waste product of fossil fuel refining. Importantly, this method disintegrates bisphenol A units into monoaryls, thus eliminating endocrine disrupting BPA from the material and from any potential downstream waste. Thiocracking of PC (10 wt%) with elemental sulfur (90 wt%) at 320 degrees C yields the highly crosslinked network SPC90. The composition, thermal, morphological, and mechanical properties of SPC90 were characterized by FT-IR spectroscopy, TGA, DSC, elemental analysis, SEM/EDX, compressive strength tests, and flexural strength tests. The composite SPC90 (compressive strength = 12.8 MPa, flexural strength = 4.33 MPa) showed mechanical strengths exceeding those of commercial bricks and competitive with those of mineral cements. The approach discussed herein represents a method to chemically upcycle polycarbonate while deconstructing BPA units, and valorizing waste sulfur to yield structurally viable building materials that could replace less-green legacy materials.
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