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Formation of Adhesive Bond
Published in Souheng Wu, Polymer Interface and Adhesion, 2017
Infrared spectroscopy. Kaas and Karods [131] treated silica powder (surface area 150 m2/g) with a 1% acetone solution of γ-aminotriethoxy-silane at room temperature. After the treatment, the free hydroxyl band at 3745 cm−1 of the silica surface decreases, the hydro gen-bonded hydroxyl band at 3500 cm−1 of the silica surface increases, and the C-––H stretching bands at 2940 and 2880 cm−1 of the silane appear, indicating adsorption of the silane by hydrogen bonding with the silanol groups on the silica. After evacuation of the treated silica at 3 × 10−5 torr and 460°C for 5 hr, the C-––H stretching bands remain, although decreased, indicating that the physically adsorbed silanes are removed by the evacuation but that the remaining fractions are chemically bound to the silica surface. In a parallel experiment using a 1:1 mole ratio of ethyltriethoxysilane and n-propylamine, n-propyl amine is found to catalyze the condensation reaction between the silane and the silica. Amino groups can hydro gen-bond with the silanol groups on the silica surface, but the hydrogen bonds are readily reversible under evacuation. The adsorbed γ-aminopropylsilane appears to exist as dimers [139],
Thermochemistry, Electrochemistry, and Solution Chemistry
Published in W. M. Haynes, David R. Lide, Thomas J. Bruno, CRC Handbook of Chemistry and Physics, 2016
W. M. Haynes, David R. Lide, Thomas J. Bruno
Promethium Propanal Propanamide Propane Propanediamide 1,2-Propanediamine, ()1,2-Propanediol 1,3-Propanediol 1,2-Propanedione 1,3-Propanedithiol Propanenitrile 1-Propanethiol 2-Propanethiol Propanoic acid Propanoic anhydride 1-Propanol 2-Propanol Propene trans-1-Propene-1,2-dicarboxylic acid cis-1-Propene-1,2,3-tricarboxylic acid trans-1-Propene-1,2,3-tricarboxylic acid Propyl acetate Propylamine Propylamine hydrochloride Propylbenzene Propyl carbamate Propyl chloroacetate Propyl 2-chlorobutanoate Propyl chlorocarbonate Propyl 3-chloropropanoate Propylcyclohexane Propylcyclopentane Propylene carbonate Propyl formate Propyl nitrate Propyl pentanoate 2-Propyn-1-amine Propyne 2-Propynoic acid Protactinium Protactinium(IV) bromide Protactinium(IV) chloride Protactinium(V) chloride 1H-Purine
2) Capture Processes (Adsorption on Solids and Absorption in Fluids)
Published in K. S. Birdi, Surface Chemistry of Carbon Capture, 2019
The carbon dioxide absorption by aqueous solutions of amine amino acid salts (AAAS) formed by mixing equi-normal amounts of amino acids, for example, glycine, β-alanine, and sarcosine, with an organic base, 3-(methyl-amino) propylamine (MAPA) was investigated by comparison with monoethanolamine (MEA) and with amino acid salt (AAS) from amino acid neutralized with an inorganic base, potassium hydroxide (KOH).
The effect of urea-formaldehyde adhesive modification with propylamine on the properties of manufactured plywood
Published in The Journal of Adhesion, 2023
Jakub Kawalerczyk, Joanna Walkiewicz, Magdalena Woźniak, Dorota Dziurka, Radosław Mirski
The investigations clearly showed that the formaldehyde content in the cured UF resin was significantly reduced due to the incorporation of propylamine (Figure 2). The amount of introduced modifier had a significant effect on the obtained results and the reduction was ranging from 9% to 34% comparing with the reference variant. The continuous decrease in the content of formaldehyde with the increasing amount of amine compound showed that the modification was successful in terms of bonding the HCHO. It resulted from the fact that amine group contained in the propylamine molecule is the most effective reactive group for formaldehyde adsorption.[45] These groups can easily react with both free formaldehyde in UF adhesive and the hydrolysed formaldehyde in the resultant panel.[46]
Synthesis, characterization, crystal structure, and antimicrobial studies of novel thiourea derivative ligands and their platinum complexes
Published in Journal of Coordination Chemistry, 2018
Ummuhan Solmaz, Ilkay Gumus, Gun Binzet, Omer Celik, Gulten Kavak Balci, Aylin Dogen, Hakan Arslan
Ligands were synthesized in two steps. In the first step, 4-chlorobenzoyl isothiocyanate was synthesized by reaction of 4-chlorobenzoyl chloride with an equimolar amount of potassium thiocyanate in dry acetone. In the second step, ligands (HL1–4) were obtained from reaction of 4-chlorobenzoyl isothiocyanate with a secondary amine (diethylamine, di-n-propylamine, di-n-butylamine, and diphenylamine) in dry acetone. Scheme 1 outlines the synthesis of the series of thiourea derivatives. The ligands were purified by recrystallization from an ethanol:dichloromethane mixture and characterized by elemental analysis, 1H NMR, 13C NMR and FT-IR techniques. Data of all synthesized compounds confirm the proposed structures (Figures S1, S3, S7, S9, S11, S15, S17, S19, S23, Supporting Information). The reaction of the ligands with potassium tetrachloroplatinate(II) at room temperature with an ethanol:water mixture as solvent yielded the four new complexes cis-[Pt(L1–4-S,O)2] (Scheme 2). All the new metal complexes were recrystallized from an ethanol:dichloromethane mixture and characterized by elemental analysis, 1H NMR, 13C NMR, cozy, HMQC, and FT-IR techniques (Figures S2, S4, S5, 6S, S8, S10, S12, S13, S14, S16, S18, S20, S21, S22, and S24, Supporting Information). The proposed structures given in Schemes 1 and 2 are consistent with the analytical and spectroscopic data.
Mechanical Flotation of Mineral Particles with an Underwater Speaker
Published in Mineral Processing and Extractive Metallurgy Review, 2023
Bingyu Yang, Chun Yong Ng, Liguang Wang
Quartz powder (silica, > 99.6% pure) with an 80% passing size of 80 μm was purchased from Sibelco Australia. The quartz sample was sieved into six size fractions: −20 µm, 20–38 µm, 38–75 µm, 75–106 µm, 106–150 µm, and 150–212 µm. An ether amine, 3-(2-Ethylhexyloxy) propylamine (EHPA, > 98.0% pure, TCI Chemicals, Japan), was applied as frother and collector in the tests. Acetic acid (> 99.0% pure, Sigma-Aldrich, USA) was used to neutralize the ether amine (at a molar ratio of 1:4.5) and increase its solubility (Araujo, Viana and Peres 2005). Brisbane tap water with electrical conductivity of 365 μS/cm and pH of 7.7 was used in all experiments.