Poly capping reaction

Coupling and Capping Reactions on Poly(2,6-dimethyl-l, 4-phenylene Oxide)... 

Mono- and bifunctionally living poly(DMS) were produced by the method reported previously.7 The end-capping reaction of the living poly(DMS) was carried out by adding... 

Figure 4.4 Capping Reaction of Poly(phenylene ether) with Methacrylic Anhydride...

Figure 4.4 Capping reaction of poly(phenylene ether) with methacrylic anhydride.

True daisy-chain-type poly[2]rotaxane was first prepared by Harada et al. in 2008 (Scheme 8). They utilized f-CD having p-aminocynnamoyl functionality as a monomer which underwent the thread-type self-assembly to yield polypseudo[2]rotaxane in water. Daisy-chain-type poly[2]rotaxane was formed via the end-capping reaction with adamantanecarboxylic acid at each end of the guest groups. The poly[2]rotaxane with molecular weight higher than 1.6 X 10" consisted of about 13 monomer units, as determined by MALDl-TOF mass spectra. 

In a manner analogous to the capping reaction, polyfunctional electrophiles react with the living PMMA anion to multiply the polymer molecular weight. Among the simplest and most effective of such reagents are the poly( -bromomethyl)benzenes. 

Tables. UV-visible absorption analysis of the efficiency of the end-capping reaction of poly(styryl)lithiums with 1,1-diphenylethylene in benzene at 25 °C...

Polymer 16 was synthesized through a poly-SNA reaction between the commercially available aminopropyl-end-capped-PDMS 15 (M 35000) and a mixture of Cgo-bis adducts 14, which was in turn prepared by the o-xylylene method [15]. After SEC purificahon, the resulting material presented a high average molecular weight (>50000) and a of 150000. 

White, D.M. and Loucks, G.R., Coupling and capping reactions on poly (2,6-dimethyl-1,4-phenylene oxide). ACS Symp. Ser., 1985. 282(React. Oligomers) p. 187-97. 

White D. M., and Loucks G. R., Coupling and Capping Reactions on Poly (2,6-dimethyl-1, 4-phenylene oxide), Polym. Prep. Am. Chem. Soc. Div. Polym. Chem., 1984, 25, 129. 

Polyurethane foams are formed by reaction with glycerol with poly(propylene oxide), sometimes capped with poly(ethylene oxide) groups with a reaction product of trimethylolpropane and propylene oxide or with other appropriate polyols. A typical reaction sequence is shown below, in which HO—R—OH represents the diol. If a triol is used, a cross-linked product is obtained. 

Noell et al. reported the preparation of silica-poly(ether ether ketone) hybrid materials with improved physical properties.155 An amine-end-capped poly(ether ether ketone) was used to react with isocyanatopropyltriethoxysilane in tetrahydrofuran (THF). The triethylsilane-end-capped poly (ether ether ketone) was mixed with tetraethoxysilane (TEOS) in THF. Quantitative amounts of water were introduced into die system, and the mixture was reduxed at 80°C. The entire reaction mixture was allowed to further react in Tedon molds. Tough transparent materials were obtained by diis approach. 

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