Solution polymerization, grafting poly

Solvent resistant laminates for printed circuits were manufactured by coating of copper foil with a solution of PPO, BPA/DC, bis(4-maleimidophenyl) ether and Zn octoate in toluene the coated foil was laminated with PPO-impregnated glass fabric [47]. Similar result was achieved by the modification of PPO with polyfunctional cyanates or maleimides, liquid polybutadiene and a polymerization catalyst [48], A solvent and heat resistant composition for printed circuits consists of copoly [(2,6-dimethylphenylene)-(2,3,6-trimethylphenylene)]oxide, maleic anhydride grafted poly-1,2-butadiene, bis(4-maleimidophenyl)methane, BPA/DC and toluene. BPA/DC prepolymer may be used instead of the monomer [49]. 

The grafting of TAA onto poly(MA-co-ABME) is carried out either by solution polymerization using dimethyl formamide as the solvent or by suspension polymerization (better yield) using dimethylformamide as the solvent and paraffin oil as the suspending medium... 

Summary Graft copolymers with poly(organosiloxane) backbone and thermoplastic side chains have been synthesized via the "grafting fi om" method based on azo- and triazene modified poly(organosiloxane)s. Initiation of free radical polymerization is possible from the polymeric azo and triazene initiators after thermal decomposition of the labile frmctions in solution. The graft products have been characterized by NMR, GPC, and DSC. Stable, free standing films can be cast from the graft copolymers. 

Poly(AB) is active [103] in the UV induced polymerization of styrene in diox-ane solution. The solvent fiactionation of the resulting polymeric product has been proved to be constituted by a small amount of linear and graft poly(styrene), the main product being a crosslinked iwlymer, according to the occurrence of termination reactions involving polymer-bound growing chain and substituted benzyl radicals. 

The poly (HEM A) sheets were prepared by B. Ratner using a special technique he developed. The HEMA solutions were poured between glass plates, and polymerization was chemically initiated. The chemical and physical properties of this material are very similar to those of radiation-grafted poly (HEMA) insofar as protein adsorption is concerned. Heterogeneous or homogeneous poly (HEMA) films were made by polymerization in solvents in which the poly (HEMA) is insoluble or soluble, respectively the result is a white opaque material in the first case and a transparent material in the second case. The resulting films were washed free of excess monomer and then soaked in the buffer to be used in the fibrinogen adsorption experiment for 10 days at 37 °C prior to the actual experiment. 

Typical results in the graft polymerization of poly (styrene-alt-maleic anhydride) onto polystyrene in solution without a radical catalyst are shown in Table I. Analogous results are obtained in the presence of a radical catalyst. 

The results in Table XIV were obtained by adding an aqueous zinc chloride solution to a poly (butyl acrylate) latex. After precomplexation at 30°C, the monomer mixture and the redox catalyst were added, and the polymerization was carried out at 30°C. Because of the heterogeneity of the reaction mitxure, a large amount of alternating copolymer accompanied the alternating copolymer graft copolymer. 

Block and graft copolymer systems have also invoked interest with studies on poly(m-phenylene-isophthalamide)-fe-ethylene oxide or -h-dimethylsiloxane systems where conditions have been established for (AB) and triblock ABA and BAB synthesis. Poly(m-phenylene-isophthalamide) has been grafted with acrylonitrile following metallation in liquid ammonia. Regular copolyamide sequences have been prepared by a two-stage low-temperature solution polymerization yielding biphenylene terephthalamide-adipamide and dimethyl piperazine terephthalamide-adipamide copolymers. The preparation of regular aliphatic-aromatic copolyoxamides from diamine-oxamides and aromatic diadd... 

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))... 

With the development of enzymatic polymerization in solution, also first accounts for SIP appeared. Loos et al. [350] reported on enzymatic surface polymerization of glucose-l-phosphate with potato phosphorylase as the catalyst resulting in oligo- or poly-(a,l- 4)-D-glucopyranose. As initiator sites, immobilized malto-heptaose was used. Enzymatic grafting of hexyloxyphenol onto chitosan is reported by Payne and coworkers [351]. 

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