The weight percentage gain (WPG) and the acetyl group content of wood due to acetylation with acetic anhydride have been analyzed by means of Fourier transform infrared spectroscopy (FTIR) and near-infrared spectroscopy (NIR). Band height ratios (BHR) (1240/1030 (1230/1030) and 1745/1030 (17...
No rise in polydispersity occurs in the case of thermal cyclization of PAE to PI in nitrobenzene, but increases in [η] and X w are observed. In the conversion of PAE to PI in solution in presence of acetic anhydride and pyridine, no changes in [η], X w or in the polydispersity ...
a1.2 Mr. Enrico Ruffini or Fausto Ramozzi for Acetic Anhydride and Weak Acid Recovery production at a monthly rate of Euro 12,000 per person 1.2 先生。 恩里科Ruffini或Faustus Ramozzi为乙酸酐和微弱的酸补救生产在到月度就职欧洲12,000为人 [translate] aJenny,你能在周六下午来参加我的聚会不?
Then each chitosan sample was-acetylated with acetic anhydride under a homogeneous condition where chitosan was dissolved in a simple aqueous acetic acid. The degree of-acetylation was estimated byH NMR spectroscopy. As a result, the water-solubility of-acetylated chitosan with about 50% substitution...
N-methylisatoic anhydride (M25) is a useful precursor for preparing esters or amides of the small N-methylanthranilic acid fluorophore. The small size of this fluorophore should reduce the likelihood that the label will interfere wit...
by mass 8 UN2790 II CORROSIVE Y840 0.5 L 851 1L 1L Acetic acid solution with > 10% and < 50% acid, by mass 8 UN2790 III CORROSIVE Y841 1L 852 5L 5L CORROSIVE, Acetic anhydride 8 3 UN1715 II FLAMMABLE LIQUID Y840 0.5 L 851 1L 1L Acetone 3 UN1090 II FLAMMABLE LIQUID Y341 1L...
In this study, as a continuation of our previous studies, chemical modification of low-molecular-weight polystyrenes (PSs) was carried out with various functional group modifiers: epichlorohydrin (ECH), maleic anhydride (MA) and acetic anhydride (AA), in a single stage using a cationic catalyst...
The invention discloses a preparation method of low-molecular-weight acetyl-terminated allyl alcohol polyether. The method comprises the steps of using low molecular weight allyl alcohol polyether and acetic anhydride as the raw materials, carrying out esterification, bubbling deacidification, hydrolysis ...
The cellulose ether is reacted with (i) a dicarboxylic acid anhydride or (ii) a combination of an aliphatic monocarboxylic acid anhydride and a dicarboxylic acid anhydride. Preferred aliphatic monocarboxylic acid anhydrides are selected from the group consisting of acetic anhydride, butyric anhydride an...
aromatic monomers, especially styrene, with one or more additional unsaturated, copolymerizable monomers, particularly the ethylenically unsaturated nitrile monomers (such as acrylonitrile and/or methacrylonitrile), maleic anhydride, alkyl methacrylate, N-substituted maleimide or other polymerizable comonomers...