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康男, 菊池; 和明, 堀; 靖彦, 大西

doi:10.1246/nikkashi.1980.1157

Cited by 6 publications

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“…The solubility of each MC was examined by immersing it (10 mg) in different solvents (5 mL) for 24 h. The miscibility limit of each MC in a ternary solvent mixture, NaBracetone-HzO, was determined according to the procedure described in the previous paper. 12 Thermogravimetric analysis (TGA) was performed in air with a heating rate of 5"C/min and a flow rate of 100 mL/min with a Seiko Instruments SSC-5000 thermal analyzer and a thermogravimetric module. Scanning electron microscopy was carried out with a JEOL JSM-840 at 10 kV in the usual way.…”

Section: Characterization Of Macromolecular Complexesmentioning

confidence: 99%

Preparation and properties of macromolecular complexes consisting of [2‐(diethylamino)ethyl]dextran hydrochloride and potassium metaphosphate

Kubota

Kikuchi

1993

J of Applied Polymer Sci

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SYNOPSISIn aqueous solution [ 2-(diethy1amino)ethyll dextran hydrochloride (EA) was reacted with potassium metaphosphate (MPK) to form a series of water-insoluble macromolecular complexes (MC ) at different hydrogen-ion concentrations (EA-MPK system). EA was also reacted with MPK in the presence of CaC12 ( EA-MPK-CaC12 system). The structure and properties of MC obtained were compared with each other; elemental analysis, IR spectroscopy, solubilities, thermogravimetric analysis, and scanning electron microscopy were used to characterize these complexes. The molecular structure and properties of each MC were dependent on the hydrogen-ion concentration and whether the Ca2+ ion coexisted. It was suggested that MC prepared at acidic pH were composed of a relatively loose network including a small quantity of MPK, whereas those prepared at neutral and alkaline pH were composed of a relatively tight network including a large quantity of MPK. This seemed to be due to changes in the degree of dissociation and the conformation of EA and MPK with the hydrogen-ion concentration. MC in the EA-MPK-CaC12 system were supposed to have a rather tightly bound network structure due to the Ca2+ ion as compared with those in the EA-MPK system. 0 1993 John Wiley & Sons, Inc.

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Section: Characterization Of Macromolecular Complexesmentioning

confidence: 99%

Preparation and properties of macromolecular complexes consisting of [2‐(diethylamino)ethyl]dextran hydrochloride and potassium metaphosphate

Kubota

Kikuchi

1993

J of Applied Polymer Sci

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Properties of membranes from polyelectrolyte complexes consisting of methyl glycol chitosan, [2‐(diethylamino)ethyl]dextran, and poly(potassium vinyl sulfate)

et al. 1987

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Water-insoluble polyelectrolyte complexes (PEC) were prepared by mixing methyl glycol chitosan (MGC, 1) and [2-(diethylamino)ethyl]dextran @A, 2) with poly(potassium Vinyl sulfate) (PVSK, 3) in aqueous solution at various hydrogen ion concentrations. Elemental analyses, IR spectroscopy, and solubilities of PEC reveal that PEC differ in molecular structure and properties according to pH. It seems that the degree of dissociation and the conformation of MGC, EA, and PVSK change with pH. PEC membranes were made by casting from solutions of all kinds of PEC, and transport phenomena through the membrane of PEC prepared in 4 wt.-Vo HCl solution were investigated under various conditions. The driving force of the transport depends on the membrane potential, Donnan potential, and diffusion potential, according to measurements of the transport ratio of Na+ and the electric potential difference between the left-and right-hand side of the membrane. Moreover, the permeability of K + is higher than that of Na+ .

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Preparation and properties of macromolecular complexes consisting of chitosan derivatives and potassium metaphosphate

Kubota

Kikuchi

1992

Makromol. Chem.

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Glycol chitosan (GC) and methyl glycol chitosan (MGC) were, individually, reacted with potassium metaphosphate (MPK) to form a series of water-insoluble macromolecular complexes (MC) in aqueous solution at different hydrogen ion concentrations (GC-MPK and MGC-MPK systems). GC was reacted with MPK in the presence of CaCI, (GC-MPK-CaC1, system) as well as in the absence of CaCl,. The properties of MC obtained were studied. On the basis of elemental analysis, solubilities, and thermogravimetry analysis, it is suggested that the molecular structure of each MC depends on the hydrogen ion concentration and whether CaZ+ ion is present or not. MC prepared at pH 1,0 are composed of a relatively loose network including a small quantity of MPK, whereas those MC prepared at neutral and higher pH are composed of a relatively tight network including a large quantity of MPK. As compared with MC in the GC-MPK system, those in the GC-MPK-CaCI, system are anticipated to have a rather tightly bound network structure due to the cross-linkings through Ca2+ ions.@ 1992, Hiithig & Wepf Verlag, Basel CCC 0025-1 16X/92/$05.00

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Cited by 6 publications

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Preparation and properties of macromolecular complexes consisting of [2‐(diethylamino)ethyl]dextran hydrochloride and potassium metaphosphate

Preparation and properties of macromolecular complexes consisting of [2‐(diethylamino)ethyl]dextran hydrochloride and potassium metaphosphate

Properties of membranes from polyelectrolyte complexes consisting of methyl glycol chitosan, [2‐(diethylamino)ethyl]dextran, and poly(potassium vinyl sulfate)

Preparation and properties of macromolecular complexes consisting of chitosan derivatives and potassium metaphosphate

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