Poly synthesis procedure

Synthesis. Graft copolymer was formed in aqueous solution by ceric-ion-initiated, radical polymerization of monomer on starch. Polymerization was conducted in an inert, atmosphere. Details of the synthesis procedure may be found in references 41 to 43 In recovering the polymer product, freeze drying was used with care since freeze drying produces a more dissolvable and useful product but can degrade polymers with molecular weights of 1 million or more. Poly(starch-g-(1-amidoethylene)) Poly(starch-g-(1-amidoethylene))... 

Poly(phenylacetylene) and poly(diphenylacetylene) consist of polyaromatic conjugated fragments side by side with polyene chains. The photosensitivity strongly depends from acceptor concentration, supermolecular structure, the synthesis procedure [177], The acceptor molecules inclusion increased the photosensitivity, the optimum of which was obtained for heterogeneous phases with a large interface area. The transition of the amorphous structure into the crystal one promoted the photosensitivity increase. The maximum quantum yield of 10 3 was at the energy 3 eV, mobilities were varied from 10-9 to 10-6 m2 V-1 s-1. 

Alternatively, initiator cores have been tethered to solid support (Merrifield resins [83]). Using protein synthesis procedures that avoid the workup difficulties involved in handling large excesses of reagents, one can readily control dendrimer growth. Unfortunately, only noncleavable linkers have been examined to date with these PAMAM dendrimers. The use of initiator cores possessing cleavable linkers should make dendrimer synthesis and isolation very facile. This was demonstrated for mono-dendrons derived from poly(lysines) as reported by Tam et al. [105-107] (Fig. 26). 

Zhao and co-workers have made major advances in the soft-template synthesis of mesoporous carbons. They reported the self-assembly of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) and resol mixtures and successful removal of the templates including F127, F108 and P123 at a series of temperatures to produce mesoporous polymer and carbon materials. " ° Eigure 4.10 illustrates the five-step synthesis procedure reported by Meng et Low-... 

H. B. Ouada, and H. Maaref. The effect of synthesis procedure on physical properties of poly(p-phenylene vinylene) derivatives. Eur. Polym. J., 37(4) 683-690, April 2001. 

Considering the results obtained from the ROP test reactions in Sect. 3.3.1.2, the lactide block of poly(4-X-styrene)- -poly(D,L-lactic acid) (PXS-ft-PLA) was polymerized according to the general synthesis procedure described in Sect. 3.2.6 under the following conditions Equimolar amounts of DBU and thiourea were chosen as catalyst and chloroform as solvent. The molar ratio of lactide catalyst was 50 1 and the combined mass concentration of the monomer and macroinitiator in chloroform was 10 %. The stirring mixtures were allowed to react at room temperate for at least 80 min. 

Samples used in this work are the mixtures of poly (vinyl methyl ether) (PVME, 1.0 X 105, M = 2.5) and polystyrene (PS) derivatives. To be able to induce phase separation by light, the PS component was chemically labeled with photoreactive groups, either with anthracene (A) or rra/i -stilbene (S). The synthesis procedure of these polymers was published elsewhere (8,16). 

Soft template method by using block copolymers was reported for first time by Liang et al. [72] in 2004. After that, a significant progress on the fabrication of carbon with a well ordered mesopores was achieved [32, 73-77]. Zhao and coworkers performed a widespread study of soft template via the triblock poly (ethylene oxide) (PEO) and poly(propylene oxide) (PPO) based systems, PEO-PPO-PEO [65, 78]. Several ordered pore stmctures corresponding to various surfactant liquid crystal phases were synthesized by liquid crystal template pathway, a schematized synthesis procedure is shown in the Pig. 7.11. 

In a two-step synthesis procedure, the B-trichloroborazine reacts with ammonia or amine derivatives as linking reagents to form B-aminoborazines which are subsequently thermolyzed at moderate temperatures to generate poly[B-aminoborazine] [25 7]. Pioneering works in this chemistry have described the preparation of B-aminoborazine-type polymers through a two-step procedure [31,32,34], but no attention has been given to the materials as BN precursors. 

The second approach which generates poly(fi-aminoborazines) is based on the reaction of 5-chloroborazine derivatives with linking reagents such as silazanes in an one-step synthesis procedure. The earliest successful efforts to prepare poly[5-aminoborazine] according to this one-step synthesis procedure are those made by Paine et al. [38] They have synthesized a large variety of polymers by reaction of 5-chloroborazine derivatives with disilazanes. 

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