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Synthetic Routes to Metal-containing Polymers

Synthetic Routes to Metal-Containing Polymers 33 1.5.2.2.3 Ring-Opening Polymerization (ROP)... [Pg.35]

The sodium condensation reaction of a,co-bis(chlorosilyl)-substituted compounds and the coupling reaction of dilithio derivatives of compounds bearing 7t-electron systems with dichlorosilanes offer a convenient route to various silicon containing polymers. However, the polymers prepared by these methods always contain a small proportion of siloxy units in the polymer backbone, which would interrapt the electron delocalisation. Therefore, new synthetic routes to organosilicon polymers have been developed in which no alkali metal halide condensations are involved [6, 7]. We report syntheses of organosilicon... [Pg.703]

An alternative and often facile route to appropriately functionalised ICPs, that avoids the synthetic problems outlined in (ii) above, is the use of sulfonated species containing the desired molecular recognition/receptor site as the dopant anion for the conducting polymer chains. For example, calixarene-containing polypyrroles [34] and polyanilines [35] for selective metal ion detection have recently been prepared via the use of sulfonated calixarenes as dopant anions. We have similarly found that the incorporation of metal complexing agents such as sulfonated 8-hydroxyquinoline as dopants in polypyrroles provides a simple route to metal ion-selective ICPs [36]. [Pg.373]

This survey of synthetic routes to metallopolymers completes the discussion of introductory topics in this chapter. In the following chapters, the main classes of metal-containing polymers will be discussed, with emphasis not only on synthetic details, but also on their properties and applications. The general philosophy will be to focus on well-characterized and well-studied materials which are truly polymeric in nature (Mn> 10,000, see section 1.2.3) rather than to exhaustively discuss every metallopolymer mentioned in the literature. Particular attention is given to examples where studies of properties and potential functions have been performed. [Pg.36]

The difficulty of assembling metal-containing polymers has been and continues to be a synthetic challenge. The process of attempting to prepare these polymers has led to a number of novel preparative routes. [Pg.296]

Several new and general synthetic routes to vinyl organo-metallic monomers have been developed in our laboratories. Many of these monomers undergo radical-initiated homo- and copolymerizations to produce a variety of new metal-containing polymers. [Pg.263]

For detailed characterization and extensive studies of reactivity, multi-gram quantities are still needed and large-scale metal vapor synthetic routes are necessary. The equipment required for this is well-documented (4) and so will not be described in detail here. The principles are those of the Fluid Matrix Technique except that in order to accommodate 10-100 gram of polymer, the coreactant is contained within a rotating flask which serves to provide a continuously renewed film as metal atoms are produced under high vacuum. [Pg.243]

Ionomers of practical interest have been prepared by two synthetic routes (a) copolymerization of a low level of functionalized monomer with an olefinically unsaturated monomer or (b) direct functionalization of a preformed polymer. Typically, carboxyl containing ionomers are obtained by direct copolymerization of acrylic or methacrylic acid with ethylene, styrene and similar comonomers by free radical copoly-merization. Rees (22) has described the preparation of a number of such copolymers. The resulting copolymer is generally available as the free acid which can be neutralized to the degree desired with metal hydroxides, acetates and similar salts. Recently, Weiss et al.(23-26) have described the preparation of sulfonated ionomers by copolymerization of sodium styrene sulfonate with butadiene or styrene. [Pg.8]

This volume begins with a general review that includes an overview of the general types of polymers already synthesized. Different approaches to their synthesis and background information are included to help the reader to understand transition metal-containing macromolecules. This information provides an introduction to both Volumes 6 and 7 of this series. Activity in this important area is increasing exponentially. New materials, properties, synthetic routes, and common applications constitute the root of this rapid development. [Pg.232]

Using the synthetic strategy in eqs 2 and 3, the polymers for this study were synthesized by the route shown in Scheme 4. Note that the amount of Cl-containing aromatic diisocyanate was varied, which gave polymers with different glass transition temperatures as well as polymers that have different metal-radical trap to metal atom ratios. For example, PU-90 has a of 35 C and a 9 1 [C-Cl] [Mo] ratio, and PU-70 has a of-44 °C and a 7 1 [C-Cl] [Mo] ratio. (The XX number in the PU-XX nomenclature indicates the mole fraction of aromatic diisocyanate in the overall amount of diisocyanate used in the formulation.)... [Pg.390]


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Metal synthetic routes

Polymer Synthetic polymers

Polymer route

Synthetic metals

Synthetic polymers

Synthetic route

Synthetic routes to polymers

To contain

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