摘要:
The synthesis of the first examples of a new class of inorganic macromolecules, the polythiophosphazenes, is reported. When heated at 90.degree. C., the cyclothiophosphazene N.sub.3 P.sub.2 SCl.sub.5 undergoes ring-opening polymerization to yield the high polymeric polythiophosphazene [N.sub.3 P.sub.2 SCl.sub.5 ].sub.n. The latter functions as a reactive macromolecular intermediate and undergoes halogen replacement with sodium phenoxide and sodium o-phenylphenoxide to afford the polymers [N.sub.3 P.sub.2 S(OPh).sub.5 ].sub.n and [N.sub.3 P.sub.2 S(OC.sub.6 H.sub.4 Ph--o).sub.3.25 Cl.sub.1.75 ].sub.n, respectively.
摘要翻译:报道了一类新的无机大分子,即聚硫代磷腈的合成。 当在90℃下加热时,环硫基磷腈N 3 P 2 SCl 5进行开环聚合,得到高分子聚硫代磷腈[N 3 P 2 SCl 5] n。 后者用作反应性大分子中间体,并用苯酚钠和邻苯基苯酚钠进行卤素置换,分别得到聚合物[N 3 P 2 S(OPh)5] n和[N 3 P 2 S(OC 6 H 4 Ph-o)3.25 Cl1.75] n。
摘要:
Hexachlorocyclotriphosphazene and poly(dichlorophosphazene) react with the sodium salt of ethyl p-hydroxybenzoate to give small molecule cyclic and high polymeric phosphazenes with aryloxy ester side groups; reaction of these compounds with potassium tert-butoxide brings about complete hydrolysis of the ester groups to yielding aqueous media-soluble, carboxylic acid bearing cyclic and high polymeric phosphazenes; the carboxylic acid bearing high polymer formed ionic cross-links when treated in aqueous media with salts of di- or trivalent cations yield hydrogels and membranes. The cross-linked gels were stable in neutral or strongly acidic aqueous media, but the cross-linking process was reversed in basic aqueous solutions of excess monovalent cations.
摘要:
Cyclic phosphonitrilic halides are formed rapidly and in high yield in a controllable multi-step process including the step of reacting a nitrogenous base (e.g. pyridine) with a phosphorus tetrahalide (e.g. phosphorus pentachloride) in a suitable inert liquid reaction medium (e.g. monochlorobenzene) to form a complex and in a subsequent step reacting this complex with an ammonium halide (e.g. ammonium chloride) at a temperature above about 90.degree. C. up to the reflux temperature of the reaction medium to form cyclic phosphonitrilic halides, mainly trimer.
摘要:
A long-acting, local anesthetic, comprising a polymeric phosphazene backbone, and 2-amino-4-picoline radical having local anesthetic activity and an amino functional group on the ring of said radical through which said radical is covalently attached to the phosphazene backbone by a phosphorous-nitrogen single bond is disclosed along with medicaments containing such anesthetics.
摘要:
Carboranylmethylene-substituted cyclophosphazenes which can be thermally polymerized into carboranylmethylene-substituted phosphazene polymers, useful as thermally stable coatings and, due to the characteristics of these polymers in acting as a ligand for transition metals, metallocarboranylmethylene phosphazene polymers which can act as immobilized catalyst systems, and are electrically conductive and superconductive.
摘要:
Carboranyl-substituted polyphosphazenes are prepared by heat polymerizing a carboranyl halocyclophosphazene at 250.degree. C. for about 120 hours in the absence of oxygen and moisture. The cyclophosphazene is obtained by allowing a lithium carborane, e.g. the reaction product of methyl-o-carborane with n-butyllithium in ethyl ether, to react with e.g. hexachlorocyclotriphosphazene at ambient temperatures and in anhydrous conditions. For greater stability in the presence of moisture, the chlorine substituents of the polymer are then replaced by aryloxy or alkoxy groups, such as CF.sub.3 CH.sub.2 O--.The new substantially inorganic polymers are thermally stable materials which produce a high char yield when exposed to extreme temperatures, and can thus serve to insulate less heat and fire resistant substances.
摘要:
A pore plugging material, for pH dependent membrane diffusion, in which cyclic olefins having phosphazene-functional moieties provide predictable erosion properties when used to plug pores in separation barriers and other porous membranes. Specific properties of the polymers are dependent on several factors, including molecular weight and identity of side groups attached to the phosphazene moiety. However, as a class, phosphazene-functional cyclic olefins provide both predictable erodibility and uniformly benign hydrolysis products and are, therefore, uniquely suitable as pore plugging polymers for separation barriers and membranes of all kinds. The invention, therefore, embraces the provision of a pH-sensitive erodible pore plugging material for pores in separation barriers and membranes of all kinds.
摘要:
A process for the preparation of polyphosphazenes is provided that includes the cationic solution polymerization reaction of a phosphoranimine, using a main group or transition metal halide, or other appropriate halide salt, including a linear phosphazene salt of any chain length, or a preformed non-phosphazene polymer containing a main or transition metal chloride, as an initiator. In a preferred embodiment, triarmed-star polyphosphazenes having the formula N{RN(H)R'.sub.2 P--(N.dbd.PR'.sub.2).sub.n }.sub.3 are prepared via this method. Also, a methods for synthesis of the monomer Cl.sub.3 P.dbd.NSiMe.sub.3 and cyclic trimer N.sub.3 P.sub.3 X.sub.6 from the reactants N(SiR.sub.3).sub.3 and PX.sub.5 are also described.
摘要翻译:提供了一种制备聚磷腈的方法,其包括使用主要基团或过渡金属卤化物或其它合适的卤化物盐(包括任何链长的线性磷腈盐)或预成型非离子表面活性剂的正亚胺的阳离子溶液聚合反应, 含有主要或过渡金属氯化物的磷腈聚合物作为引发剂。 在优选的实施方案中,通过该方法制备具有式N {RN(H)R'2P-(N = PR'2)n} 3的三臂星型聚磷腈。 此外,还描述了从反应物N(SiR 3)3和PX 5合成单体Cl 3 P = NSiMe 3和环状三聚体N 3 P 3 X 6的方法。
摘要:
A process for the preparation of polyphosphazenes is provided that includes the cationic solution polymerization reaction of a phosphoranimine, using a main group or transition metal halide, or other appropriate halide salt, including a linear phosphazene salt of any chain length, or a preformed nonphosphazene polymer containing a main or transition metal chloride, as an initiator.
摘要:
A method for encapsulating biologically-labile materials such as proteins, liposomes, bacteria and eucaryotic cells within a synthetic polymeric capsule, and the product thereof, are disclosed. The method is based on the use of a water-soluble polymer with charged side chains that are crosslinked with multivalent ions of the opposite charge to form a gel encapsulating biological material, that is optionally further stabilized by interactions with multivalent polyions of the same charge as those used to form the gel. In the preferred embodiment, hydrolytically stable polyphosphazenes are formed of monomers having carboxylic acid side groups that are crosslinked by divalent or trivalent cations such as Ca.sup.2+ or Al.sup.3+, then stabilized with a polycation such as poly-L-lysine. A variety of different compositions can be formed from the crosslinked polymer. In a preferred embodiment, microcapsules are made by spraying an aqueous solution of polyphosphazene and material to be encapsulated into a calcium chloride solution.