Lecture_5_1_09 - Chapter 24 Polymer Materials: Synthetic...

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Chapter 24 Polymer Materials: Synthetic and Biological
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Synthetic Polymers Polymers are species of very high molecular weight consisting of many units (monomers). A simple example is polyethylene , which consists of many ethylene units, -CH 2 CH 2 -, covalently bonded to one another.
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Synthetic Polymers Polymers are classified as addition polymers or condensation polymers, depending on the type of reaction used in forming them. An addition polymer is a polymer formed by linking together many molecules by addition reactions.
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Synthetic Polymers Polymers are classified as addition polymers or condensation polymers, depending on the type of reaction used in forming them. Rubber is an addition polymer. Natural rubber is a homopolymer of isoprene units; synthetic rubber SBR (styrene-butadiene rubber) is a copolymer.
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Synthetic Polymers Polymers are classified as addition polymers or condensation polymers, depending on the type of reaction used in forming them. Nylon-6.6 is an example of a condensation polymer. It is produced by condensing hexamethylene diamine with adipic acid.
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Electrically Conducting Polymers Certain polymers, such as trans- polyacteylene, are semi-conductors. By doping them with substances such as iodine, their electrical conductivities can be greatly increased. One of the first applications of a conducting polymer was to produce a battery .
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Electrically Conducting Polymers Certain polymers, such as trans- polyacteylene, are semi-conductors. These polymers have also been used to produce electronic devices, including transistors and LEDs. Figure 24.7 shows some other significant conducting polymers.
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Nucleic Acids Nucleic acids are polymers of nucleotides.
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Lecture_5_1_09 - Chapter 24 Polymer Materials: Synthetic...

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