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Browsing by Author "Schneiderman, Deborah K"

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    Supporting data for Polymeric medical sutures: An exploration of polymers and green chemistry
    (2018-01-17) Knutson, Cassandra M; Schneiderman, Deborah K; Yu, Ming; Javner, Cassidy H; Distefano, Mark D; Wissinger, Jane E; jwiss@umn.edu; Wissinger, Jane E
    These files contain data along with associated output from instrumentation supporting all results reported in Knutson, C. M.; Schneiderman, D. K.; Yu, M.; Javner, C. H.; Distefano, M. D.; Wissinger, J. E. Polymeric medical sutures: An exploration of polymers and green chemistry. J. Chem. Educ. 2017, 94, 1761–1765. In Knutson, et. al. it was found that with new K–12 national science standards emerging, there is an increased need for experiments that integrate engineering into the context of society. Here we describe a chemistry experiment that combines science and engineering principles while introducing basic polymer and green chemistry concepts. Using medical sutures as a platform for investigating polymers, students explore the physical and mechanical properties of threads drawn from poly(ε-caprolactone) samples of different molecular masses and actual purchased absorbable and nonabsorbable medical sutures. An inquiry-based part of the experiment tasks students with designing their own experiment to probe the potential of melt blending poly(ε-caprolactone) with commercially available polylactide products in order to modify the properties of the “sutures” drawn. Through these lessons students gain an appreciation for the importance of plastics in our society and how scientists are working to develop more sustainable alternatives. Overall, this laboratory experiment provides a feasible, versatile, sophisticated laboratory experience that engages students in a relatable topic and meets many of the Next Generation Science Standards.
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    Supporting Data for “Renewable, Degradable, and Chemically Recyclable Cross-Linked Elastomers”
    (2017-05-18) Hillmyer, Marc A; Brutman, Jacob P; De Hoe, Guilhem X; Schneiderman, Deborah K; Le, Truyen, N; hillmyer@umn.edu; Hillmyer, Marc A
    These files contain data along with associated output from instrumentation supporting all results reported in Jacob P. Brutman, Guilhem X. De Hoe, Deborah K. Schneiderman, Truyen N. Le, and Marc A. Hilmyer Renewable, Degradable, and Chemically Recyclable Cross-Linked Elastomers. Industrial & Engineering Chemistry Research 2016 55 (42), 11097-11106. In Brutman et. al. we found: Most commercial elastomers, typified by vulcanized natural rubber, are cross-linked polymers and as such cannot easily be reprocessed or recycled. While some are derived from renewable resources, the majority are produced from petroleum feedstocks and do not easily degrade. In this study, renewable elastomers based on β-methyl-δ-valerolactone were produced using two different methodologies: (1) tandem copolymerization/cross-linking with a bis(six-membered cyclic carbonate); (2) cross-linking of a linear poly(β-methyl-δ-valerolactone) homopolymer with a free-radical generator. The mechanical properties of these materials were investigated; tensile strengths of up to 12 MPa and elongations of up to 2000% were observed. Inclusion of a filler (fumed silica) was used to enhance the performance of the elastomers without significant loss of elasticity, with some composites exhibiting tensile strengths nearly double that of the neat elastomer. Aqueous degradation studies indicated that the materials were capable of degradation in acidic and basic conditions at 60 °C. Moreover, these cross-linked elastomers can also be chemically recycled, yielding monomer in high purity and yield (>91% and 93%, respectively).