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Thermal Analysis of PlasticsTeresa D'Amico, Craig J. Donahue, and Elizabeth A. Rais Students interpret previously recorded scans generated by differential scanning calorimetry and thermal gravimetric analysis to investigate a polypropylene dog bone, a polyethylene terephthalate pop bottle, the plastics in automobile head- and taillights, fishing line and a tea bag, and the rubber tread of an automobile tire. D'Amico, Teresa; Donahue, Craig J.; Rais, Elizabeth A. J. Chem. Educ.2008, 85, 404.
Materials Science |
Polymerization |
Thermal Analysis
Gifts from Mother Earth—The Good, the Bad, and the UglySabine Heinhorst and Gordon C. Cannon Recent articles from the journal Nature that deal with good, bad, and ugly gifts from Mother Earth are described. Heinhorst, Sabine; Cannon, Gordon C. J. Chem. Educ.2006, 83, 196.
Biosynthesis |
Biotechnology |
Natural Products |
Nutrition |
Plant Chemistry |
Polymerization |
Proteins / Peptides
A Green Polymerization of Aspartic Acid for the Undergraduate Organic LaboratoryGeorge D. Bennett Based on a technology that won a Presidential Green Chemistry Challenge Award, this experiment involves the thermal polymerization of aspartic acid and subsequent hydrolysis to give sodium poly(aspartate). The procedure is suitable for introducing students to the important topic of polymers and for illustrating several of the principles of green chemistry. Bennett, George D. J. Chem. Educ.2005, 82, 1380.
Addition PolymersEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Polymerization
Condensation PolymersEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Polymerization
Copoly; A Tool for Understanding Copolymerization and Monomer Sequence Distribution of CopolymersMassoud Miri, Juan A. Morales-Tirado The study of the composition and monomer sequence distribution of binary copolymers is often complicated because of the many definitions of representative properties for the sequence distribution, the numerous calculations required, and occasionally the abstract treatment of the statistical processes describing the copolymer formation. Copoly resolves these issues with a user-friendly, highly visual interface to perform all calculations. Using Microsoft Excel and Word, Copoly is compatible with Windows and Mac OS. In Copoly the students enter up to five independent data parameters using the Data Input Window, and immediately see the results. To obtain diagrams for a copolymerization obeying a second-order Markovian process, the fraction of one monomer, A, and the reactivity ratios, rA, rB, rA´ and rB´ need to be entered; for a first-order Markovian process only the first three of these are required. For a Bernoullian- or zeroth-order Markovian process only A and rA are required. The results are displayed on separate sheets labeled: 1. Copolymerization Diagrams, 2. Dyads and Triads, 3. Sequence Length Distribution, 4. Simulated Copolymer Design, and 5. Summary.
