Hydroxyl-terminated poly

Generation of radicals by redox reactions has also been applied for synthesizing block copolymers. As was mentioned in Section II. D. (see Scheme 23), Ce(IV) is able to form radical sites in hydroxyl-terminated compounds. Thus, Erim et al. [116] produced a hydroxyl-terminated poly(acrylamid) by thermal polymerization using 4,4-azobis(4-cyano pentanol). The polymer formed was in a second step treated with ceric (IV) ammonium nitrate, hence generating oxygen centered radicals capable of starting a second free radical polymeriza-... 

Poly(methyl 3-(l-oxypyridinyl)siloxane) was synthesized and shown to have catalytic activity in transacylation reactions of carboxylic and phosphoric acid derivatives. 3-(Methyldichlorosilyl)pyridine (1) was made by metallation of 3-bromopyridine with n-BuLi followed by reaction with excess MeSiCl3. 1 was hydrolyzed in aqueous ammonia to give hydroxyl terminated poly(methyl 3-pyridinylsiloxane) (2) which was end-blocked to polymer 3 with (Me3Si)2NH and Me3SiCl. Polymer 3 was N-oxidized with m-ClC6H4C03H to give 4. Species 1-4 were characterized by IR and H NMR spectra. MS of 1 and thermal analysis (DSC and TGA) of 2-4 are discussed. 3-(Trimethylsilyl)-pyridine 1-oxide (6), l,3-dimethyl-l,3-bis-3-(l-oxypyridinyl) disiloxane (7) and 4 were effective catalysts for conversion of benzoyl chloride to benzoic anhydride in CH2Cl2/aqueous NaHCC>3 suspensions and for hydrolysis of diphenyl phosphorochloridate in aqueous NaHCC>3. The latter had a ti/2 of less than 10 min at 23°C. 

The compound was examined as a propellant explosive, it proved easily detonable and more sensitive than ammonium perchlorate. A formulation with hydroxyl terminated poly butadiene binder ignited spontaneously at room temperature [1]. Other workers have found it more tractable [2]. 

Separation according to functionality at critical conditions was for the first time actualized on the hydroxyl-terminated poly(diethylene glycol adipate) (PDEGA) of Mn 2000 using a silica gel-filled chromatographic column and hexane — methylethyl ketone (MEK) as eluent70)... 

Hedrick, J.L. Yilgdr, I. Wilkes, G.L. McGrath, J.E. Chemical modification of matrix resin networks with engineering thermoplastics. I. Phenolic hydroxyl terminated poly(aryl ether sulfone)-epoxy systems. Polym. Bull. 1985, 13, 201-208. 

The most important oligo-polyol obtained by radical mechanism is hydroxyl terminated poly butadiene. Dienes (butadiene, isoprene), in conditions of radical polymerisation are special monomers because during radical polymerisation, which is a nonstereospecific polymerisation, several types of microstructures are generated in the same chain. Thus, in the particular case of butadiene the following types of microstructures are generated ... 

Hydroxyl Terminated Poly BD Resins, Functional Liquid Polymers, Electrical applications brochure, Atochem North America, Inc., Oct. 1990. 

In the simplest approach to obtaining elastomer reinforcement, some of the organometallic material is absorbed into the cross-linked network, and the swolloi sarrqrle placed into water containing the catalyst (typically a volatile Ime such as ammonia or ethylamine). Hydrolysis to form the desired silica-like particles proceeds rapidly at room temperature to yield the order of 50 wt % filler in less than an hour. - - The polymer most studied in this regard is hydroxyl-terminated poly(dimethylsiloxane) (PDMS), of repeat unit [-Si(CH3)20-]. 

Fra Francis, B., Thomas, S., Jose, J., Ramaswamy, R., Rao, V. L. Hydroxyl terminated poly (ether ether ketone) with pendent methyl group toughened epoxy resin miscibility, morphology and mechanical properties. Polymer 46 (2005) 12372-12385. 

The exo-olefin is a precursor to a variety of chain-end-functionalized polymers via postpolymerization reaaions as shown in Scheme 37. Hydroxy-functionalized PIB has been utilized as a precursor for the preparation of RAFT macromo-lecular CTAs and carboxylic acid end-fimctionalized polymers. Telechelic PIB diols have been prepared using p-dicumyl chloride/BCU initiator system followed by dehydro-chlorination, hydroboration, and alkaline peroxide oxidation. Aldehyde end-fiinctionalized PIBs have been used to prepare carboxyl- and hydroxyl-terminated poly-mers. Carboxylic acid-functionalized PIBs have also been prepared from the oxidation of the methyl ketone-functionalized PIBs." The hydroxyl-functionalized PIBs have also been used to prepare methacrylate macromonomers by their reaction with methacryloyl chloride in the presence of triethylamine. The homopolymerization and copolymerization of these maaomonomers with methyl methacrylate were also reported. Cyanoacrylate-funaionalized PIBs prepared via the hydroxyl-functionalized PIB were also reported by Kennedy et al. ... 

HTBN Hydroxyl terminated poly(butadiene/acrylonitrile)... 

Hydroxyl-terminated poly (propylene oxide-block-ethylene oxide) [10,110]... 

Hydroxyl-terminated poly ether ehter ketone (PEEK)... 

Rigbi, Z. Mark, J. E., Concurrent Chain Extension and Crosslinking of Hydroxyl-Terminated Poly(dimethylsiloxane) Possible Formation of Catenate Structures. J. Polym. Sci., Polym. Phys. Ed. 1986, 24, 443-449. 

In conclusion, the hydroxyl terminated poly(arylene ether sulfone) oligomers of controllable molecular weight were synthesized by the NMP/K CO route. These oligomers were isolated and reacted in a second step with terephthaloyl chloride with or without added biphenol to form segmented copolymers. This second reaction was performed either in solution or interfacial-ly. It was found that the interfacial process allowed a higher percentage... 

From the T S/h) vs T h/r) plot for the curing reaction of hydroxyl-terminated poly(tetrahy-drofuran) lelechelic oligomer with styrene illustrated in Figure 3.18 at a heating rate of... 

The condensation-type silicone impression materials are based on hydroxyl-terminated poly(dimethylsiloxane), ie, viscous liquids of structure (Fig. 4). Colloidal silica or micronized metal oxides, having 5-10 fj,m particle size, are added to prepare a paste which is cross-hnked with an alkyl silicate containing 50% ethoxy groups, such as tetraethyl orthosihcate (TEOS). Organic tin activators, such as stannous octoate or dihutyltin dilaurate (2), are used at the 1-2% level. 

HT-ETE Hydroxyl-terminated poly(oxyethylene)-b-poly(oxytetramethylene)-b-poly-(oxyeth-ylene)... 

Archambault JG, Brash JL. Protein repellent polyurethane-urea surfaces by chemical grafting of hydroxyl-terminated poly(ethylene oxide) effects of protein size and charge. Colloids SutfB Biointerfaces 2004 33 111-20. http //dx.doi.Org/10.1016/j.colsurfb.2003.09.004. Desai NP, Hubbell JA. Solution technique to incorporate polyethylene oxide and other water-soluble polymers into surfaces of polymeric biomaterials. Biomaterials 1991 12 144-53. 

To address this problem, Xu et al. synthesized dendrimer-encapsulated Co nanoparticles, (Gg-OH(Cogo)) with narrow size distribution (1.6 0.4 nm), by using hydroxyl-terminated poly (amidoamine) dendrimer of generation six [42], and they investigated its catalytic activity for hydrolysis of ammonia borane. The results indicated that hydrogen generation from room temperature... 

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