期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 11, 页码 13940-13948出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b02283
关键词
Packaging waste; Biochar; Autogenic carbonization; Postconsumer PET; Filament extrusion; 3D printing
资金
- NSF-AL-EPSCoR [1655280]
- NSF-RISE [1459007]
- NSF-CREST [1137681]
- [NSF-MRI-1531934]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1531934] Funding Source: National Science Foundation
Recently, the demand for high-performance, 3D-printable polymer composites has grown exponentially. The objective of this work is to develop a novel low cost and sustainable biochar-recycled poly(ethylene terephthalate) (PET) composite with improved mechanical and thermal performance. Biochar was derived from the pyrolysis of packaging waste at a high temperature and autogenic pressure. The typical temperature and pressure of the reaction are similar to 1100 degrees C and 150 bar. Biochar was ground and sieved to below 100 mu m, and it was melt compounded with recycled poly(ethylene terephthalate) derived from postconsumer PET bottles (Aquafina). Biochar/PET composite filaments of 1.75 mm were produced using a melt extruder. The filaments were used to 3D print tensile, DMA, and TMA sample coupons using a Hyrel 30 M printer. Biochar was analyzed for its textural properties, thermal stability, and surface morphology. The as-prepared polymer composite was studied for its thermal, mechanical, and dynamic mechanical properties. These results showed that the incorporation of biochar improved the composite mechanical, thermal, and dynamic properties. A 0.5 wt % biochar infusion in PET resulted in a 32% increase in tensile strength. The polymer composite with 5 wt % loading has shown a 60% increase in tensile modulus over neat PET. Moreover, biochar has significantly improved the composite dynamic modulus, dimensional stability, and thermal stability in an oxidative environment.
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