| Autor: |
Lopez, Claudia V., Karunarathna, Menisha S., Lauer, Moira K., Maladeniya, Charini P., Thiounn, Timmy, Ackley, Edward D., Smith, Rhett C. |
| Zdroj: |
Journal of Polymer Science; August 2020, Vol. 58 Issue: 16 p2259-2266, 8p |
| Abstrakt: |
Here are reported composites made by crosslinking unsaturated units in canola, sunflower, or linseed oil with sulfur to yield CanS, SunS, and LinS, respectively. These plant oils were selected because the average number of crosslinkable unsaturated units per triglyceride vary from 1.3 for canola to 1.5 for sunflower and 1.8 for linseed oil. The remeltable composites show compressive strengths that increase with increasing unsaturation number from CanS(9.3 MPa) to SunS(17.9 MPa) to LinS(22.9 MPa). These values for SunSand LinSare competitive when compared with the value of 17 MPa required for residential building using traditional Portland cement. The plant oil composites are recyclable over many cycles and can retain up to 100% of strength after 24 hr in oxidizing acid under conditions where Portland cement is dissolved in under 30 min. Infusion of the composites into premade cement blocks affords them with significantly improved acid resistance as well. This work thus provides a simple, nearly 100% atom economical route to convert plant oils and waste sulfur to composites having enhanced performance over commercial structural materials. Triglycerides and elemental sulfur react to produce composites with better strength compared with traditional cement. These triglyceride‐sulfur composites can be recycled by simple melt‐processing. They are quite good thermal insulators and are highly acid resistant. This work provides a simple, nearly 100% atom economical route to convert plant oils and waste sulfur to composites with enhanced properties over commercial structural materials. |
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