Molar mass

Ebook "Deformation and flow of polymeric materials" describes the properties of single polymer molecules and polymeric materials and the methods how to characterize them. Molar masses, molar mass distributions and branching structure are discussed in detail. These properties are decisive for a deeper understanding of structure/properties relationships of polymeric materials. This book therefore describes and discusses them in detail.

564p tudohanhtau1006 29-03-2024 4 1   Download

Ebook "Studies on “perfect” hyperbranched chains free in solution and confined in a cylindrical pore" also reveals how the chain structure of amphiphilic hyperbranched block and graft copolymers affect their solution properties, including the establishments of several classic scaling laws that relate the chain size and the intrinsic viscosity to the overall molar mass and the subchain length, respectively. This work has led to numerous publications in high-impact peer-reviewed journals.

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Ebook "Multidimensional HPLC of polymers (Manuals in Polymer science)" presents the principle ideas of combining different analytical techniques in multi-dimensional analysis schemes. It reviews the basic principles and instrumentation of multi-dimensional chromatography and the hyphenation of liquid chromatography with selective spectroscopic detectors and presents experimental protocols for the analysis of complex polymers.

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Ebook "Polymer physics" introduces the reader to the fascinating field of polymer physics. It is intended to be utilized as a textbook for teaching upper level undergraduates and first year graduate students about polymers. Any student with a working knowledge of calculus, chemistry, and physics should be able to read this book. The essential tools of the polymer physical chemist or engineer are derived in this book without skipping any steps.

458p loivantrinh 29-10-2023 7 2   Download

Ebook Facts on file science experiments: Chemistry experiments - Part 2 includes contents: Chapter 12: endothermic and exothermic reactions, chapter 13: finding molar mass, chapter 14: chemical moles, chapter 15: heat energy, chapter 16: chloride levels, chapter 17: the rate of rusting, chapter 18: thin layer chromatography, chapter 19: levels of sugar, chapter 20: microscale percent composition.

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Procedures for chitin nanofiber or nanocrystal extraction from Crustaceans modify the chitin structure significantly, through surface deacetylation, surface oxidation and/or molar mass degradation. Here, very mild conditions were used to disintegrate chitin fibril bundles and isolate low protein content individualized chitin nanofibers, and prepare nanostructured high-strength chitin membranes.

9p vihermione 06-01-2023 8 2   Download

A viscometric study was carried out at 25 ◦C to assess the physical–chemical behavior in solution and the mean viscometric molar mass (M¯ v) of chitosan solutions with different deacetylation degrees, in two solvent mixtures: medium 1—acetic acid 0.3 mol/L and sodium acetate 0.2 mol/L; and medium 2—acetic acid 0.1 mol/L and sodium chloride 0.2 mol/L.

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Hyaluronic acid (HA) is a ubiquitous polysaccharide with diverse biological functions. Is known that in the intestinal epithelium, the exogenous HA of molar mass ≥105 Da orally administered antagonizes TLR4 overexpression resulting from dysbiosis and promotes immunomodulation in multifactorial crosstalk, thus helping to treat or to prevent injuries.

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The influence of oxygen (0–50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 ◦C–160 ◦C. Purified galactoglucomannan was studied as a reference.

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The chain sequence of co-polymers strongly affects their physical properties. It is, therefore, of crucial importance for the development and final properties of novel materials. Currently however, few analytical methods are available to monitor the sequence of copolymers.

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An efficient 2-component synthesis of a series of 3-(2-(substituted phenylamino)thiazol-4-yl)-2H -chromen-2- ones (3a–j) was achieved by the reaction of 3-(2-thiocyanatoacetyl)-2H -chromen-2-one (1) with a variety of suitably substituted anilines in 1:1 molar ratio in ethanol. The structures of the products were established by elemental analyses, and UV-vis, FTIR, 1H and 13C NMR, and mass spectroscopy. 3-(2-(4-Methylphenylamino)thiazol-4-yl)-2 H -chromen-2- one (3j) was further characterized by single crystal X-ray diffraction study.

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A series of binucleating Cu(II), Ni(II), and Zn(II) complexes of bicompartmental ligands with ONO donors were prepared. The ligands were synthesized by the condensation of 5-substituted-3-phenyl-1H -indole-2-carboxyhydrazides and 4,6-diacetylresorcinol. The newly synthesized ligands and their complexes were characterized by elemental analysis and various spectral studies like IR, 1H NMR, ESI-mass, UV-Vis, ESR, thermal studies, magnetic susceptibility, molar conductance, and powder-XRD data.

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The new heterobimetallic [Mg(II)-Ti(IV)]-µ-oxoisopropoxide was synthesized on treatment of magnesium acetate with titanium(IV) isopropoxide in refluxing decalin in 1:2 molar ratio and characterized by liberated isopropanol, elemental, spectral (IR, 1H and 13C NMR, and mass), thermal analysis, and molecular weight data.

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Solvent-based polyurethanes and poly(urethane-acrylate)s were synthesized using phosphorus-containing polyester polyols in order to compare the thermal properties of different polymer types. Since the location of the phosphorus group might have vital importance when comparing the thermal properties, phosphorus groups were kept on the pendant chains in poly(urethane-acrylate)s using phosphorus-containing urethane macromonomers while they were kept on the backbone in polyurethanes.

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The nucleophilic substitution reaction of hexachlorocyclotriphosphazene (N3P3Cl6, trimer) (1) with 4- hydroxy-1-naphthaldehyde (2) has been investigated for the first time. 4′ -Oxy-1′ -naphthaldehyde substituted mono- (3), bis- (4), and tris- (5) cyclotriphosphazenes were obtained from the nucleophilic substitution of compound 1 with 2 in a 1:2 molar ratio in the presence of Cs2CO3 in acetone at reflux.

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Lecture Basic chemistry: A Foundation - Chapter 8. After studying this section will help you understand: chemical composition, atomic masses, chemical packages moles, molar mass, percent composition, empirical formulas, molecular formulas,...

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Lecture General Chemistry 1 - Chapter 3: Stoichiometry. After studying this section will help you understand: balance chemical equations; predict the products of simple combination, decomposition, and combustion reactions; calculate formula weights; convert grams to moles and moles to grams using molar masses,...

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In this work, we studied the applicability of diffusion ordered nuclear magnetic resonance spectroscopy (DOSY NMR) as an alternative method in determination of polystyrene molecular weight. DOSY NMR spectroscopy allows measuring the diffusion coefficient of molecule which directly depend on hydrodynamic radius and so on, average molar mass in weight (Mw).

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(bq) part 2 book "chemistry experiments" has contents: microscale percent composition, levels of sugar, thin layer chromatography, the rate of rusting, chloride levels, heat energy, chemical moles, finding molar mass, endothermic and exothermic reactions, solutions and spectrophotometry.

104p bautroibinhyen21 14-03-2017 48 9   Download

The putative gene ofPlasmodium vivaxserine hydroxymethyltransferase (PvSHMT; EC 2.1.2.1) was cloned and expressed in Escherichia coli. The purified enzyme was shown to be a dimeric protein with a monomeric molecular mass of 49 kDa. PvSHMT has a maximum absorption peak at 422 nm with a molar absorption coefficient of 6370m )1 Æcm )1 . The Kd for binding of the enzyme and pyridoxal-5-phosphate was 0.14 ± 0.01lm.

14p vinaphone15 25-02-2013 48 2   Download