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Related to diacid: Diether


1. (Chemistry) another word for diacidic
2. (Chemistry) (of a salt or acid) containing two acidic hydrogen atoms: NaH2PO4is a diacid salt of phosphoric acid.
(Elements & Compounds) an acid or salt that contains two acidic hydrogen atoms


(daɪˈæs ɪd)

1. capable of combining with two molecules of a monobasic acid.
2. (of an acid or a salt) having two replaceable hydrogen atoms.
References in periodicals archive ?
The effects of the type of diol, diacid, and hydroxyl-terminated PDMS, and the amount of hydroxyl-terminated PDMS on the preparation and surface properties of SPU were investigated.
A series of diacid ezatiostat analogs bearing different substituents on the cysteinyl sulfur were synthesized using computer aided drug design and TRAP, a proprietary drug discovery technology, to improve the inhibitory potency and selectivity for the target enzyme GST P1-1.
In one case, a silane-coated nanoparticle containing amine groups is mixed with a diacid chloride monomer before polymerization.
has been granted a patent for an aqueous composition useful as an adhesive comprised of at least one halogenated olefin polymer, at least one high-functionality epoxy resin, and at least one diacid-modified resin that is different from the halogenated olefin polymer; wherein the diacid-modified resin is made by reacting one or more resins that contain carbon-carbon double bonds with one or more diacid or diacid-derivative small molecules with carbon-carbon double bonds.
Synthesis and Photopolymerization Kinetics of New Flexible Diacrylate and Dimethacrylate Crosslinkers Based on C18 Diacid," Polymer, 44, 963-968 (2003).
Several process parameters including diamine concentration, diacid chloride concentration, dipping sequence, reaction time and the number of interfacial polymerization cycles were investigated.
The 1,2-cyclohexyl-based oligoesters are different from the 1,3- or 1,4-based oligoesters, since the starting material is an anhydride and not a diacid, as shown in Figures 1 and 2.
The diacids 3a-c were refluxed with excess thionyl chloride to obtain diacid chlorides 4a-c, which on treatment with the dihydrazide 5, in presence of lithium chloride and pyridine underwent polycondensation to give required polyhydrazides 6a-c.
HAS are particularly effective when reacted into the nylon, either by inclusion of a diacid or diamine derivative thereof into the preparation of the polymer (see picture on previous page), or by reacting an acid or amine derivative with an amine or acid chain end on the polymer molecule.
Briefly, those polymers were prepared by low temperature polycondensation reaction of equimolar amounts of a diamino-oxadiazole or of a mixture 1:1 of a diamino-oxadiazole and 9,9-bis(p-aminophenyl)-fluorene with the silicon-containing diacid chloride, using N-methylpyrrolidone (NMP) as a solvent and with pyridine as an acid acceptor.
The cycloaliphatic diacid provides polyesters with better solubility in MEK than polyester prepared from aromatic and linear diacids.
The diacid is being explored as a biobased raw material for new additives and resin systems for paints and coatings with improved hydrophobicity, flexibility, and chemical resistance and as a zero/low-VOC coalescent for waterborne coatings.