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→Monomer characteristics: info Nonpolar Monomers: Styrene and 1,3-Butadiene Derivatives Akira Hirao, Katsuhiko Takenaka |
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== Monomer characteristics ==
===Vinyl monomers===
Vinyl monomers have the formula CH<sub>2</sub>=CHR and CH<sub>2</sub>=C(R)Z. Some of the most important are styrene, butadiene, and isoprene. Many acrylate esters are ammenable.
===Cyclic monomers===
Many cyclic compounds are susceptible to [[ring-opening polymerization]]. [[Epoxide]]s, cyclic [[trisiloxane]]s, some lactones, [[lactide]]s, [[cyclic carbonate]]s, and [[amino acid N-carboxyanhydride]]s.
In order for polymerization to occur with [[vinyl group|vinyl]] [[monomer]]s, the [[substituent]]s on the [[double bond]] must be able to stabilize a [[negative charge]]. Stabilization occurs through [[delocalization]] of the negative charge. Because of the nature of the [[carbanion]] propagating center, substituents that react with bases or nucleophiles either must not be present or be protected.<ref name="Quirk"/>
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