Chemistry. Foundations and Applications. Po-Z by J. J. Lagowski

By J. J. Lagowski

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Thermosets are materials that have sufficient crosslinking present so that they are prevented from being soluble and melting when heated. Such materials are therefore difficult to recycle. Thermoplastics are materials that melt on heating and generally contain little or no crosslinking. They can be recycled more easily through heating and reforming. Linear polymers are thermoplastic materials. Fibers. Fibers require materials with a high tensile strength and high modulus (high force required for elongation).

University of Southern Mississippi Department of Polymer Science. edu/marcrogϾ. ” Chemical Heritage Foundation. htmlϾ. Polymerase Chain Reaction DNA: deoxyribonucleic acid—the natural polymer that stores genetic information The polymerase chain reaction (PCR) is used to make millions of copies of a section of deoxyribonucleic acid (DNA). Until the 1980s obtaining numerous copies of a section of DNA took one to two weeks and required isolation of the DNA, cloning the DNA into a viral or plasmid vector, growing the cloned DNA using living host cells, usually bacteria, and finally isolating the DNA again.

The CH2 groups joined by double bonds in natural rubber are all on the same sides of the double bonds (the cis configuration), whereas those in gutta-percha are on opposite sides of the double bonds (the trans configuration). This single structural difference changes the elasticity of natural rubber to the brittle hardness of gutta-percha. S E E A L S O Deoxyribonucleic Acid; Nucleic Acids; Polymers, Synthetic; Proteins. Melvin D. Joesten Bibliography Atkins, Peter W. (1987). Molecules. New York: W.

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