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Covalent molecular assembly of oligoimide ultrathin films in supercritical and liquid solvent media.
An ultrathin film of oligoimide has been fabricated on amine-modified substrates of silicon and quartz through alternate layer-by-layer (LBL) assembly of pyromellitic dianhydride (PMDA) and diaminodip...Read More
Novel zwitterionic inorganic-organic hybrids: Synthesis of hybrid adsorbents and their applications for Cu^2^+ removal
A series of zwitterionic hybrid adsorbents were prepared via the ring-opening polymerization of pyromellitic acid dianhydride (PMDA) and N-[3-(trimethoxysilyl)propyl] ethylene diamine (TMSPEDA), and a...Read More
A chemically modified lipase preparation for catalyzing the transesterification reaction in even highly polar organic solvents.
Acylation of Pseudomonas cepacia lipase with Pyromellitic dianhydride to modify 72% of total amino groups was carried out. Different organic solvents were screened for precipitation of modified lipase...Read More
Polyacid-modified composite resins (compomers) are restorative dental materials that exhibit certain features of traditional dental composites and glass-ionomer cements. The aim of this paper was to d...Read More
Preparation of zwitterionic hybrid polymer and its application for the removal of heavy metal ions from water
A series of zwitterionic hybrid polymers were prepared from the ring-opening polymerization of pyromellitic acid dianhydride (PMDA) and phenylaminomethyl trimethoxysilane (PAMTMS), and a subsequent so...Read More
Desorption behavior of methylene blue on pyromellitic dianhydride modified biosorbent by a novel eluent: acid TiO2 hydrosol.
In this study, waste beer yeast powder was modified by pyromellitic dianhydride to improve its adsorption capacities for cationic dye: methylene blue (MB). According to the Langmuir equation, the maxi...Read More
Microwave-assisted synthesis and characterization of optically active poly (ester-imide)s incorporating L-alanine.
Pyromellitic dianhydride (1) was reacted with L-alanine (2) to result [N,N'-(pyromellitoyl)-bis-L-alanine diacid] (3). This compound (3) was converted to N,N'-(pyromellitoyl)-bis-L-alanine d...Read More
Stark effect of intrinsic and extrinsic charge-transfer excitons in a linear donor-acceptor stack: anthracene-pyromellitic dianhydride.
Anthracene-PMDA single crystals display at 2K about 70 meV below a well-known intrinsic charge-transfer exciton three narrow absorption lines, which are attributed to CT excitons bound to defects of a...Read More
The experimental and calculational thermochemistry of 1,2,4,5-benzenetetracarboxylic dianhydride: is this 10 pi multiring species aromatic?
The standard (p degrees = 0.1 MPa) molar enthalpy of formation of 1,2,4,5-benzenetetracarboxylic dianhydride in the gaseous phase, -826.8 +/- 3.1 kJ mol-1, was derived from the standard molar enthalpy...Read More
[The lipid peroxidation system in the organism of experimental animals after exposure to cyclic hydrocarbons].
The paper presents the results of studies of the amounts of diene conjugates, malonic dialdehyde, and Schiff's bases, which are molecular LPO products in the tissues of the lung, liver, kidney in...Read More
NTCDA-TTF first axial fusion: emergent panchromatic, NIR optical, multi-state redox and high optical contrast photooxidation.
The first synthetic entry into axially fused NTCDA/PMDA-TTF multipolar molecules demonstrates a high optical contrast photooxidation, panchromism, low HOMO-LUMO gap, generation of a stable radical cat...Read More
A simple method to prepare magnetic modified beer yeast and its application for cationic dye adsorption.
The purpose of this research is to use a simple method to prepare magnetic modified biomass with good adsorption performances for cationic ions. The magnetic modified biomass was prepared by two steps...Read More
A situ co-precipitation method to prepare magnetic PMDA modified sugarcane bagasse and its application for competitive adsorption of methylene blue and basic magenta
Magnetic pyromellitic dianhydride (PMDA) modified sugarcane bagasse (SCB) was prepared by a situ co-precipitation method. Results showed that the magnetic modified SCB could be recycled easily by an a...Read More
Novel nanostructure amino acid-based poly(amide-imide)s enclosing benzimidazole pendant group in green medium: fabrication and characterization.
In the present work, several novel optically active nanostructure poly(amide-imide)s (PAI)s were synthesized via step-growth polymerization reaction of chiral diacids based on pyromellitic dianhydride...Read More
The use of enzymes in organic solvents offers a great opportunity for the synthesis of complex organic compounds and is therefore in focus of current research. In this work we describe the synthesis o...Read More
Comparison of IgE antibody concentrations to pyromellitic dianhydride-modified laminin and human serum albumin in sera of exposed workers with respiratory complaints.
Acid anhydrides are used in a variety of industrial branches because of their highly reactive anhydride groups. Adverse effects of anhydride exposure include toxic/irritative effects as well as IgE- a...Read More
[The validation of the maximum permissible concentration of pyromellitic dianhydride in the atmosphere].
The maximum allowable concentration (MAC) of pyromellitic acid dianhydride (PMAD) in the ambient air was substabtiated by physiological, hematological, and physiological methods. The inhalation of thi...Read More
Three bronchoconstrictive responses associated with acute rhinitis and occurring in two patients were observed among 400 nasal allergen challenges. Causative substances were birch pollen, Dermatophago...Read More
This study aimed at investigating sensitizing and hazardous effects of a new acid anhydride, pyromellitic dianhydride (PMDA), in addition to those of phthalic anhydride, maleic anhydride and trimellit...Read More
Acute autoimmune response in a case of pyromellitic acid dianhydride-induced hemorrhagic alveolitis.
A 17-year-old man was occupationally exposed to pyromellitic acid dianhydride dust during the production of epoxy resin in a chemical factory. He was clinically diagnosed as having acute hemorrhagic a...Read More
X-ray diffraction study of the disorder-to-order transition at approximately 160 K in the pi-molecular compound pyrene ... pyromellitic dianhydride.
The crystal structure of pyrene ... pyromellitic dianhydride [(C16H10:C10H2O6); PYRPMA] has been studied over the range 300-19 K, using the low-temperature accessory designed by Samson, Goldish & ...Read More
X-ray diffraction study of the crystal structure of the π-molecular compound pyrene ... pyromellitic dianhydride at 19 K
The crystal structure of the pyrene ... pyromellitic dianhydride (PMDA) pi-molecular compound [(C16H10:C10H2O6); PYRPMA] has been refined from intensities measured at 19 K using the low-temperature ac...Read More
[Analysis of chromosome aberrations and nucleolar organizer regions of chromosomes in workers producing pyromellitic dianhydride: the possibility of the adaptive role of Ag-NOR variants].
To assess the mutagenic danger of pyromellitic dianhydride (PMDA) production, the frequency of chromosome aberrations in peripheral blood lymphocytes from 56 workers and 37 control donors from Ufa was...Read More
[An analysis of the chromosome aberrations in the peripheral blood lymphocytes of workers in the manufacture of pyromellitic dianhydride].
The report covers results of cytogenetic screening of workers engaged into pyromellitic dianhydride production. Occurrence of chromosomal aberrations in peripheral lymphocytes was studied in 42 worker...Read More