Engineering Plastics Handbook by James Margolis

By James Margolis

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Chemistry of Polymerization 9 The free electrons are relayed along the polymer chain to the end of the polymer where the free electrons continue to chemically bond, forming polymers. Monomers with reactive free radicals keep adding on to the growing polymer chains until either the reactive monomers or the initiator is consumed. With chain-growth free-radical polymerization, monomers are added to the free-radical ends of growing molecules which are effectively long-chain free radicals. Two growing free radicals combine (coupling) or disproportionate, causing termination of chain growth.

Ionic polymerization uses anionic or cationic catalysts. Monomers with electron-accepting groups at the double bonds such as vinyls are catalyzed by anionic catalysts such as organometallic compounds [16, 17]. Monomers with electron-donating groups at the double bonds are catalyzed by cationic catalysts such as Lewis acids, Ziegler catalysts, and Friedel Crafts catalysts [16, 17]. Polyacetals are linear polymers that can be produced by anionic or cationic chain-growth polymerization of formaldehyde [2, 14].

USA, 2001. 6. , USA, 1997. Chemistry of Polymerization 17 7. University of Stuttgart, Institute for Polymer Testing and Polymer Science, Stuttgart (Vaihingen), Germany. 8. Joseph M. , USA, 2001. 9. , USA. 10. Mahendra D. , USA, 1982. 11. The University of Melbourne, Department of Chemical Engineering, Victoria, Australia. 12. , USA, 1997. 13. Zhi-An Liang and Ke Chen, “Synthesis and Ring-Opening Polymerization of Macrocyclic Aromatic Sulfide Oligomers,” Polymer International, 53(11):1845–1850 (Nov.

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