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Showing 1 to 15 of 15 for “"acidolysis"”.
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Synthesis and basic characteristics of segmented poly(arylene ether sulfone)-poly(arylate) copolymers
… either by solution t interfacial, or melt acidolysis techniques. The melt acidolysis technique was used to synthesize the segmented copolymers with high poly(arylate) contents. The morphology of the copolymers was found to be totally amorphous for those capolymers with low levels of the …
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Liquid crystalline multi-block copolymers
… with ester forming monomers in a subsequent melt acidolysis reaction to form segmented poly(sulfone)-poly(arylate) co- or terpolymers. Earlier work by Lambert (281-283) showed that solution and interfacial techniques could only be utilized to synthesize segmented polymers with low poly(arylate) …
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Effects of Thermomechanical Refining on Douglas fir Wood
… correlated with higher refining energy. Lignin acidolysis was detected using nitrobenzene oxidation, conductometric titration of free phenols, and formaldehyde determination. Formaldehyde was generated via the C2 lignin acidolysis pathway, but C3 cleavage was the dominant lignin reaction. …
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The Synthesis and Characterization of Some Ir(III) Dicationic Complexes
… the product was soluble in nonpolar solvents. Acidolysis was utilized to synthesize fac-IrCH3Cl2(PMe3).3 from the reaction between Ir(CH3)3(PMe3)3 and 2 equivalents of HCl. Ir(III) methyl dications have also been synthesized by the reaction of 2 equivalents triflic acids with …
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Design and synthesis of handles for solid-phase peptide synthesis and convergent peptide synthesis
… releases C-terminal peptide amides upon acidolysis. Since the FAL handle is acid labile it is compatible with Fmoc and N<sup>α</sup>-dithiasuccinoyl (Dts) based chemistries, but not N<sup>α</sup>-tert-butyloxycarbonyl (Boc) based chemistries. The solid-phase linkage was investigated based …
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Synthesis and characterization of polyether-ester liquid crystalline polyesters and poly(arylene ether ketone)-lcp segmented copolymers
… butylisophthalic acid were synthesized via melt acidolysis techniques. The resulting high molecular weight polyarylates were amorphous polymers and the t-butyl groups along the polymer backbones were found to be thermoxidatively stable. Thermotropic liquid crystalline polyesters (LCPs) are well …
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About the gel structure of lignin
… alkyl-aryl ether content decreases rapidly with acidolysis treatment under reflex conditions, phenolic hydroxyl content increases conversely. Molecular weight increases as delignification procedes. As crosslink density is a function of alkyl-aryl ether content, these results suggest that the 6 7 …
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Mechanisms of biogenic formaldehyde generation in wood
… affected CH₂O generation as predicted in the acidolysis literature of lignin model compounds and isolated lignins. Lignin methoxyl cleavage was also observed, but was considered an unlikely source of thermochemical CH₂O. Alkaline pretreatments suppressed CH₂O generation. Regarding wood-based …
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Dendronized Amphiphilic Copolymers Synthesized from Methacrylate Derivatives as Potential Topical Microbicides
… observed. Ionizable polymers were achieved via acidolysis with trifluoroacetic acid; significant increases in Tg were observed. For the copolymers, the Tgs of the acids increased as the copolymer composition increased in MIII. For the homopolymers, Tgs decreased with increasing MMP …
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Biopolymer Structure Analysis and Saccharification of Glycerol Thermal Processed Biomass
… weight, near to that of the enzymatic mild acidolysis lignin. Better thermal stability was observed for this GTP lignin. In addition to lignin, xylan was successfully isolated as another polymer stream after GTP pretreatment. The recovered water insoluble xylan (WIX) was predominant alkali …
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Structure and reactivity of cyclic imido derivatives of phosphoric acid
… initial C-N cleavage, followed by ring closure Acidolysis studies were carried out in anhydrous TFA. These studies indicated that the low reactivity towards nucleophilic attack of 2-amino (23), 2-methylamino (24),2-dimethylamino (25) and 2- p-anisidino (43) derivatives may also be accounted for …
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Synthesis and characterization of high performance polymeric materials: poly(arylene ethers), polyamides, polyesters and liquid crystalline polyarylates
… polyarylates (LCP) were made via melt acidolysis which were subsequently transformed to liquid crystalline foams by supersaturation of carbon dioxide followed by thermal blowing. It was found that the AB type monomers were essential to generate star shaped LCPs without crosslinking. The …
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Recovery of rare earth elements (REE) from waste printed circuit boards (WPCBs) through heterotrophic bioleaching
… from WPCBs was dominated by the proton-promoted acidolysis mechanism, with challenges associated with REE entrapment within complex compounds (e.g. mixed oxides and silicates). Furthermore, complexolysis of metals with the deprotonated organic acid was significant, particularly for Cu extraction. …
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Nervonic Acid-enriched Structured Lipids: Preparation, Encapsulation, Digestion and Storage Stability
Nervonic acid (NA) is a vital nutrient that plays a significant role in human brain development and maintenance. However, NA has very poor bioavailability in its free fatty acid (FFA) form. By incorporating NA into the phospholipid (PL) structure, the functionality of NA can be enhanced due to the …
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Structural changes to Pinus radiata wood lignin during kraft pulping and bleaching
… residual lignins were isolated by dioxane acidolysis instead. The approach taken in this thesis was to compare residual lignin from pulps bleached to the same kappa number. Such a comparison should remove the variables associated with the different oxidising powers of each reagent and yield …