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Showing 1 to 19 of 19 for “"Phthalic anhydride"”.
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Relationship between molecular structure and surface properties of self-assembled monolayers
… the 3- and 4-aminothiophenol monolayers with the phthalic anhydride were studied using reflection absorption infrared spectroscopy, contact angle measurement, ellipsometry, and electrochemical measurements. Reactions on the monolayers are used to model the attachment of an insulating polyimide to …
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The synthesis and characterization of semicrystalline polyimides
… (BDAF) and pyromellitic dianhydride (PMDA) displayed a glass transition temperature (Tg) at 306°C and a melting point (Tm) near 470°C as measured by differential scanning calorimetry (DSC) with a heating rate of 10°C/min. The degree of crystallinity increased with decreasing …
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Structural changes and dynamic behaviour of vanadium oxide-based catalysts for gas-phase selective oxidations
… and of benzene (supported V/Mo/O) to maleic anhydride, or in the form of supported metal oxide, e.g., in the manufacture of phthalic anhydride by o-xylene oxidation, of sulphuric acid by oxidation of SO2, in the reduction of NOx with ammonia and in the ammoxidation of alkyl aromatics. In …
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Synthesis and properties of lignin epoxide
… cured by crosslinking with a diamine and with phthalic anhydride. An amine-terminated rubber was added as toughening agent. Sol fraction and swelling behavior, stress-strain behavior and dynamic mechanical behavior of the cured lignin epoxides were studied in relation to cure conditions.
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Electrochemical synthesis of polyesters and polyamides. A study of the polymerisation of lactams, lactones and the anhydride/propylene oxide system by direct electrolysis of their conducting solutions
… describe the electroinitiated polymerisation of phthalic anhydride/propylene oxide, maleic anhydride/propylene oxide, caprolactam, laurolactam and E-caprolactone in N,N-dimethylformamide (DMF), acetonitrile and tetrahydrofuran (THF) using alkali metal salts or quaternary ammonium salts as …
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Investigation of Acrylated Alkyds
… oleic acid, linoleic acid or linolenic acid with phthalic anhydride and glycerol. Acrylated alkyds were synthesized by copolymerizing these model alkyds and acrylic monomers in the presence of benzoyl peroxide initiator. To elucidate the grafting sites, 2D gradient heteronuclear multiple quantum …
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AN INVESTIGATION OF INELASTIC ELECTRON TUNNELLING SPECTROSCOPY
… three isomers of benzenedicarboxylic acid and phthalic anhydride on to aluminium oxide is investigated. It has been possible to identify the spectra of the different adsorbed isomers, and to suggest the surface adsorbate species formed Orientations of the three isomers on the oxide surface have …
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Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)
… to pendant phthalimides by reaction with phthalic anhydride. The pendant amines were also reacted to form crosslinkable groups such as maleimides and phenylethynyl phenyl imides. These were thermally treated to induce crosslinking and formed ductile networks which had improved solvent …
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Water ingression into poly(imide-siloxane)s
… synthesized from benzophenone tetracarboxylic dianhydride, bisaniline P and pre-formed amine-terminated poly(dimethylsiloxane) oligomers, with phthalic anhydride as an end-capping agent. Similar copolymers had been previously shown to have reduced water sorption, increased surface hydrophobicity, …
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Structure-property behavior of novel high performance thermoplastic and thermoset structural adhesives and composite matrix resins
… of reactive amine terminated and non-reactive phthalic anhydride terminated PMDA-mBAPPO polyimides were pursued. Polyimides with non-reactive end groups do not crosslink and, hence, were essential for controlled processability. Rheological behavior was investigated with a parallel plate type …
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Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides
… benzene (TPER), but two different dianhydrides, 3,3',4',4'-biphenyltetracarboxylic dianhydride (BPDA) and 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA). Phthalic anhydride was used as an endcapper to improve the thermal stability of the polyimides. The BPDA based polyimide …
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Synthesis and Characterization of Poly(arylene ether sulfone)s for Reverse Osmosis Water Purification and Gas Separation Membranes
… resin, acryloyl chloride, phenylethynyl phthalic anhydride, and maleic anhydride. The reaction between amine terminated oligomers and a tetra-epoxy produced large, ductile membranes with gel fractions approaching 99%, the highest reported for crosslinked sulfonated polysulfone oligomers. …
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Synthesis and Characterization of Aryl Phosphine Oxide Containing Thermoplastic Polyimides and Thermosetting Polyimides with Controlled Reactivity
… 2,2'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and 1,3-phenylene diamine, in order to study their influence on flame resistance and other properties. DAMPO or DAPPO were quantitatively incorporated in concentrations of 25, 50, 75 and 100 mole percent, using the "one pot" ester-acid …
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Synthesis And Catalytic Studies Of Zinc Complexes Of Amido-Oxazolinate Ligands
… copolymerization of styrene oxide and cyclic anhydrides, including succinic anhydride, maleic anhydride, and phthalic anhydride. These catalysts exhibited unprecedented TOFs 8000 h-1 for coupling of styrene oxide and maleic anhydride. The ligand geometrical parameters strongly influence the …
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Synthesis of Sustainable Antibacterial Materials by Surface Functionalisation of NZ Flax (Phormium tenax) Fibres and Hemp (Cannabis sativa) Hurd
… adding twenty various amines. Benzaldehyde and phthalic anhydride were used as protecting agents (producing two series: BDs 81-87 and PDs 114-133, respectively). In total, 27 chitosan derived compounds were synthesised and assessed for their bioactivity against Staphylococcus aureus …
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Synthesis and Characterization of Wholly Aromatic Semicrystalline Polyimides Based Upon Bis(4-Aminophenoxy) Benzenes
… of these diamines with rigid or semi-rigid dianhydrides such as pyromellitic dianhydride (PMDA), biphenyl dianhydride (BPDA), and oxydiphthalic anhydride (ODPA) yields very thermally stable semi-crystalline polymers which have excellent resistance to organic liquids. Amorphous polyimides could …
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Crystallization and structure-property investigations of semicrystalline poly(arylene ether) based polymers
… (TPEQ diamine) and oxydiphthalic dianhydride (ODPA), endcapped with phthalic anhydride (PA) (T<sub>g</sub> = ca. 230 °C, T<sub>m</sub> = ca. 420 °C), and based on a PA endcapped meta-linked diamine, 1,3-bis(4-aminophenoxy)benzene (TPER diamine) and 3,3’, …
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A study of the synthesis and reactions of new polynuclear aromatic acids and related compounds
… of 2-(3-chloro-l-naphthylmethyl)bromobenzene to phthalic anhydride. Cyclization of this keto-acid with an acetic and hydrobromic acid mixture gave 6-chloro-7-(2-carboxyphenyl)benz[a]anthracene. Methyl ester derivatives were prepared from both this acid and the precursor keto-acid. The …