1 / 2

Education

Reinforcement of a Commercial Biodegradable Copolymer Based on Polyhydroxybutyrate by Graphene Oxide Nanosheets James E. Mark, University of Cincinnati Main Campus, DMR 0803454.

fordon
Télécharger la présentation

Education

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reinforcement of a Commercial Biodegradable Copolymer Based on Polyhydroxybutyrate by Graphene Oxide NanosheetsJames E. Mark, University of Cincinnati Main Campus, DMR 0803454 Polyhydroxyalkanoates (PHAs) have attracted much industrial attention due to their biodegradability and biocompatibility. They are produced directly from renewable resources by microbes which accumulate PHAs as carbon-storage and energy-storage materials. Copolymers of PHAs provide the best balances of physical properties, with poly(3-hydroxybutyrate-co-3-hydroxy-hexanoate) (PHBHx) now being the most important member of the Procter & Gamble NodaxTM family of such biodegradable thermoplastics. The transmission electron microscopy (TEM) results show one-atom filler thicknesses for graphene oxide (GO) (upper left portion of figure) and for reduced graphene oxide (RGO) (upper right portion). Use of the surfactant poly(diallydimethylammonium chloride) (PDAMC) with the RGO nanocomposite was found to greatly improve the dispersion of the reinforcing filler in the PHBHx matrix (lower left portion). The properties of these copolymers were found to be greatly improved when they were reinforced by these graphene nanosheeets. Preliminary results on these materials showed significant improvements in mechanical properties even at very low loadings, (less than 1.0 wt %). The thermal stabilities of these nanocomposites were also improved (lower right portion). These results indicate very strong surface interactions between the RGO with the PHBHx, and these favorable interactions should also improve a number of other physical properties. A manuscript describing these results is in preparation by Gui Lin, Isao Noda, and James E. Mark for the book “Graphene-Based Nanocomposites”, edited by P. Mukhopadhyay and R. Gupta, CRC Press, Boca Raton, FL. Upper left portion: TEM, Graphene oxide; Upper right portion: TEM, reduced graphene oxide; lower left: TEM, reduced graphene oxide with surfactant; lower right: weight residuals at 325 ˚C for PHBHx/RGO, PHBHx/GO, and the limiting case of only filler remaining.

  2. Reinforcement of a Commercial Biodegradable Copolymer Based on Polyhydroxybutyrate by Graphene Oxide NanosheetsJames E. Mark, University of Cincinnati Main Campus, DMR 0803454 Education This grant and a previous NSF Grant partially supported two graduate students, Leiyuchuan Ding (4th year) and Yan Zhang (3rd year). It also partially supported one post-doctoral research fellow, Gui Lin. Industrial Collaborations Procter & Gamble Company, Cincinnati, OH. Outreach Knowledge developed in this program was incorporated into various courses. Also, presentations have been given at several national and international conferences, and papers were published in standard refereed journals. Some of the results are also being included in the 2nd edition of the book shown in the figure (B. Erman, J. E. Mark, and C. Cohen, in preparation).

More Related