DIMETHYLSILOXANE COPOLYMER

Poly(ether ether ketone)-fc/ock-poly-dimethylsiloxane copolymers,... 

Tough, transparent, heat and flame resistant, multiblock (bisphenol fluorenone carbonate) (BPF)-dimethylsiloxane copolymers have been synthesized by interfacial polycondensation of phosgene with various mixtures of BPF end-capped siloxane oligomers and free BPF or its monosodium salt 232). Siloxane content of the copolymers were varied between 7 and 27%. Presence of two Tg s, one below —100 °C and the other as high as 275 °C, showed the formation of two-phase morphologies. 

Another soluble polymer-enlarged catalyst was synthesized and tested by Wandrey et a/.[57] The catalyst was prepared by a coupling of an oxazaborolidine via a hydrosilylation reaction to a methyl hydrosiloxane-dimethylsiloxane copolymer (Figure 4.40). The catalyst was used in the enantioselective borane reduction of ketones. 

A very versatile and important methodology for controlling the properties of polysiloxanes involves hydrosilylation [eqn (10.33)]. Reaction of poly(methyl-hydrosiloxane) or poly(methylhydrosiloxane)-poly(dimethylsiloxane) copolymers with vinyl-capped species allows the introduction of side groups which give rise to a variety of interesting properties. 

Poly(methyl methacrylate)-g-poly(dimethylsiloxane) copolymers have been prepared by free radical copolymerizations of acrylate-functional siloxane macromonomers (29) with methyl methacrylate. Siloxane macromonomers (29) of between 1,000 and 20,000 molecular weight were utilized to give a range of copolymers with between 4 and 17 wt% silicone115. 

Siloxane Polymers. The synthesis of the ferrocene-modified siloxane polymers (A - E) has been described previously (25,27,32). Briefly, the methyl(2-ferrocenylethyl)-siloxane polymers were prepared by the hydrosilylation of vinylferrocene with the methylhydrosiloxane homopolymer or the methylhydrosiloxane-dimethylsiloxane copolymers (m n ratios of 1 1, 1 2, and 1 7.5 see Figure 1) in the presence of chloroplatinic acid as a catalyst. The methyl(9-ferrocenylnonyl)siloxane-dimethylsiloxane (1 2) copolymer was prepared via hydrosilylation of 9-ferrocenyl-l-nonene with the methylhydrosiloxane-dimethylsiloxane (1 2) copolymer. The molecular weight range of these ferrocene-modified siloxane polymers is approximately 5,000-10,000. Purification of the polymers was achieved by reprecipitation from chloroform solution, via dropwise... 

Lithographic Evaluation of Poly(methyl methacrylate)-gra/t-poly(dimethylsiloxane) Copolymers... 

Poly (methyl methacrylate)-g-poly(dimethylsiloxane) copolymers were prepared by... 

Methyl-( -ferrocenylethyl)- and methyl-[ -(r,3 -dimethylferrocenyl)ethyl]siloxane polymers 53 and 54, respectively were prepared by the hydrosilylation of vinyl-ferrocene and l,T-dimethylferrocene-3-vinylferrocene with methyl hydrosiloxane (molecular weight was originally reported to be 2270) or methylhydrosiloxane-dimethylsiloxane copolymer (molecular weight was originally reported to be 2000 — 2100) in the presence of chloroplatinic acid as a catalyst. The synthetic route is given in Seheme 10-25 [62], The reaction was monitored by IR spectroscopy until the complete disappearance of the Si-H absorption at 2161 cm". ... 

Linear polymers carrying chiral oxazaborolidine as a pendant group were prepared from a methylhydrosiloxane-dimethylsiloxane copolymer [72]. Borane reduction using the polymeric oxazaborolidine 25 gave (i )-phenylethylalcohol of 97% ee which is as high as in analogous reaction with non-polymeric catalyst. This chiral polymer can be retained by a nanofiltration membrane thus will be suitable for use in a continuously operated membrane reactor. 

Tyagi, D., Hedrick, J. L., Webster, D. C., McGrath, J. E., and Wilkes, G. L., Structure-property relationships in perfectly alternating segmented polysulphone/poly(dimethylsiloxane) copolymers. Polymer, 29, 833-844 (1988). 

Aminopropylmethyl-dimethylsiloxane copolymer 3-Aminopropyl methyl, dimethyl siloxanes. See Aminopropylmethylsiloxane/dimethylsiloxane... 

Synonyms Dimethyidiphenyl siloxanes and silicones Diphenylsiloxane-dimethylsiloxane copolymer Poly (dlmethylsiloxane-co-diphenylsilox-ane) Siloxanes and silicones, dimethyl, diphenyl Uses Binder for high temp, anticorrosion paints resist, to 650 C, for use in industrial equip., chimneys, exhaust tubes heat transfer fluid dielec, coolant... 

Aminopropylmethylsiloxane/dimethylsiloxane copolymer Siloxanes and silicones, dimethyl-. See Dimethylsiloxane Siloxanes and silicones, dimethyl, diphenyl. See Phenylmethyl polysiloxane... 

Aminoethylaninopropyimethyisiloxanef dimethylsiloxane copolymer AMS-233 71786-60-2 lmbentin-OAM/200 PEG-20 oleanine 71868-10-5 Irgacure 907... 

Uddin, M.H., Rodriguez, C., Lopez-Quintela, A., Leisner, D., Solans, C., Esquena, J., and Kunieda, H. (2003) Phase behavior and microstructure of poly(oxyethylene)-poly(dimethylsiloxane) copolymer melt. Macromolecules, 36, 1261-1271. 

Amres LOPR. See Urea-formaldehyde resin Amres MOC-3066. See Polyamide Amres PR-247 HV, Amres PR-335 CU. See Urea-formaldehyde resin Amres X-184. See Polyamide AMS. See 0-Methylstyrene monomer Ammonium sulfamate AMS-132, AMS-152, AMS-162. See Aminopropylmethylsiloxane/dimethylsiloxane copolymer AMS-233. See... 

Chems. http //www.jlic.com.cn Trade Name Synonyms C3290 [United Chem. Tech, http //www.unitedchem.com] (Chloropropyl) methylsiloxane-dimethylsiloxane copolymer CAS 70900-20-8... 

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