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Articles de revues sur le sujet « PMDA »

Auteur : Grafiati

Publié le 2 juin 2025

Mis à jour le 31 juillet 2025

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1

Lee, Hwa-Seub, Jung-Suk Cha, Jun-Young Jin, Young-Jin Ko, and Tae-Yeon Seong. "Fabrication of thermally stable mid-infrared optical filters using tantalum microdisc array." Applied Physics Letters 121, no. 16 (2022): 161101. http://dx.doi.org/10.1063/5.0087318.

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To fabricate a thermally stable optical filter in the mid-infrared (MIR) region, a plasmonic metal disk array (PMDA) using tantalum (Ta) was proposed, and the filter performance was compared with that of conventional silver (Ag)-based PMDAs. A finite-difference time-domain method was utilized to systematically analyze the effects of geometric configuration and constituent materials on the optical properties of PMDA filters with a periodic hexagonal lattice. Unlike the Ag PMDA filters, whose transmission dip at resonance wavelengths gradually decreased with increasing temperature, the Ta PMDA f

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Kamimura, Naofumi, Taichi Aoyama, Rieko Yoshida, et al. "Characterization of the Protocatechuate 4,5-Cleavage Pathway Operon in Comamonas sp. Strain E6 and Discovery of a Novel Pathway Gene." Applied and Environmental Microbiology 76, no. 24 (2010): 8093–101. http://dx.doi.org/10.1128/aem.01863-10.

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ABSTRACT The protocatechuate (PCA) 4,5-cleavage (PCA45) pathway is the essential catabolic route for the degradation of various aromatic acids in the genus Comamonas. All of the PCA45 pathway genes, orf1-pmdKEFDABC, as well as another PCA 4,5-dioxygenase gene, pmdA II B II, were isolated from a phthalate-degrading bacterium, Comamonas sp. strain E6. Disruption of pmdB and pmdD in E6, which code for the β subunit of PCA 4,5-dioxygenase and 2-pyrone-4,6-dicarboxylate (PDC) hydrolase, respectively, resulted in a growth defect on PCA, indicating that these genes are essential for the growth of E6

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Delavarde, Aliénor, Sebastien Lemouzy, Aurélien Lebrun, Julien Pinaud, and Sylvain Caillol. "Paving the Way towards Sustainability of Polyurethanes: Synthesis and Properties of Terpene-Based Diisocyanate." Molecules 28, no. 20 (2023): 7133. http://dx.doi.org/10.3390/molecules28207133.

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Due to growing concerns about environmental issues and the decline of petroleum-based resources, the synthesis of new biobased compounds for the polymer industry has become a prominent and timely topic. P-menthane-1,8-diamine (PMDA) is a readily available compound synthesized from turpentine, a cheap mixture of natural compounds isolated from pine trees. PMDA has been extensively used for its biological activities, but it can also serve as a source of valuable monomers for the polymer industry. In this work, commercial PMDA (ca. 85% pure) was purified by salinization, crystallization, and alka

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COSTAMILAN, LEILA M., and WALESCA I. LINHARES. "Efetividade de genes de resistência de trigo a oídio." Fitopatologia Brasileira 27, no. 6 (2002): 621–25. http://dx.doi.org/10.1590/s0100-41582002000600011.

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Levantamentos periódicos da freqüência de virulência do patógeno causador de oídio (Blumeria graminis f. sp. tritici) em trigo (Triticum aestivum)auxiliam na escolha de fontes de resistência para uso em cruzamentos. Este trabalho relata resultados de cinco anos de verificação de efetividade de genes de resistência para populações patogênicas de B. graminis f. sp. tritici oriundas do Brasil e do Chile. Amostras de oídio foram recebidas pela Embrapa Trigo, Passo Fundo, RS, em 1995, 1996, 1997, 1999 e 2000. Inoculou-se cada isolado monopustular em plantas de trigo da série diferencial para raças.

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Hill, Tania N., and Andreas Lemmerer. "Binary charge-transfer complexes using pyromellitic acid dianhydride featuring C—H...O hydrogen bonds." Acta Crystallographica Section E Crystallographic Communications 74, no. 12 (2018): 1772–77. http://dx.doi.org/10.1107/s2056989018015645.

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Four binary charge-transfer complexes were made using pyromellitic acid dianhydride (pmda), those being pmda–naphthalene (1/1), C10H2O6·C10H8, (I), pmda–fluoranthene (1/1), C10H2O6·C16H10, (II), pmda–9-methylanthracene (1/1), C10H2O6·C15H12, (III), and pmda–ethyl anthracene-9-carboxylate (1/2), C10H2O6·2C17H12O3, (IV). All charge-transfer complexes show alternating donor and acceptor stacks, which have weak C—H...O hydrogen bonds connecting the donor and acceptor molecules. In addition, complex (I) has Z′ = 1/2, complex (II) has a Z′ = 2 and complex (IV) has half molecule of pyromellitic acid

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Wang, Jiangbo. "Functionalization of Graphene Oxide with Polysilicone: Synthesis, Characterization, and Its Flame Retardancy in Epoxy Resin." Polymers 13, no. 21 (2021): 3857. http://dx.doi.org/10.3390/polym13213857.

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A novel polysilicone flame retardant (PMDA) has been synthesized and covalently grafted onto the surfaces of graphene oxide (GO) to obtain GO-PMDA. The chemical structure and morphology of GO-PMDA was characterized and confirmed by the Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectrometer (XPS), atomic force microscope (AFM), and thermogravimetric analysis (TGA). The results of dynamic mechanical analysis (DMA) indicated that the grafting of PMDA improved the dispersion and solubility of GO sheets in the epoxy resin (EP) matrix. The TGA and cone calorimeter measureme

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Feng, Lina, Wenxian Li, Jinrong Bao, et al. "Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2." Nanomaterials 9, no. 2 (2019): 189. http://dx.doi.org/10.3390/nano9020189.

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Two novel core-shell composites SiO2@PMDA-Si-Tb, SiO2@PMDA-Si-Tb-phen with SiO2 as the core and terbium organic complex as the shell, were successfully synthesized. The terbium ion was coordinated with organic ligand forming terbium organic complex in the shell layer. The bi-functional organosilane ((HOOC)2C6H2(CONH(CH2)3Si(OCH2CH3)3)2 (abbreviated as PMDA-Si) was used as the first ligand and phen as the second ligand. Furthermore, the silica-modified SiO2@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2 core-shell-shell composites were also synthesized by sol-gel chemical route. An amorphous sil

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Chen, Haonan, Sheng Zhu, Rongfan Zhou, et al. "Thermal Degradation Behavior of Thiol-ene Composites Loaded with a Novel Silicone Flame Retardant." Polymers 14, no. 20 (2022): 4335. http://dx.doi.org/10.3390/polym14204335.

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A novel silicone flame retardant PMDA was synthesized and blended with a commercial thiol–ene (TE) to obtain a flame-retardant TE (FRTE) composite. The cone calorimeter measurement showed the incorporation of PMDA improved the flame retardancy of the TE composite at concentrations of 5 wt%. The thermal stability and degradation mechanism of FRTE in nitrogen was studied by thermogravimetric analysis. The degradation behaviour of TE containing a PMDA flame retardant was found to be changed. The kinetics of thermal degradation was evaluated by Kissinger method and Flynn–Wall–Ozawa method. The res

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SAKAI, Masato. "Pyromellitic Dianhydride(PMDA)." Journal of Synthetic Organic Chemistry, Japan 50, no. 7 (1992): 659–60. http://dx.doi.org/10.5059/yukigoseikyokaishi.50.659.

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Yang, Rui, Ming Yang Chen, and Pei Li. "Carbon molecular sieve hollow fiber composite membrane derived from PMDA-ODA polyimide for gas separation." High Performance Polymers 34, no. 4 (2022): 444–54. http://dx.doi.org/10.1177/09540083211032384.

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Carbon molecular sieve (CMS) membranes have excellent gas separation property over conventional polymeric membranes and superior anti-swelling property. PMDA-ODA polyimide has high thermal stability and good mechanical property. It has been extensively adopted as the precursor of CMS membrane. However, due to the insoluble nature, PMDA-ODA CMS membranes are limited to configurations like dense symmetric films or composite membranes using porous inorganic or metal substrates. In this work, CMS hollow fiber composite membranes based on an asymmetric PMDA-ODA hollow fiber were successfully prepar

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Bao, Xiaohui, Fangyi Wu, and Jiangbo Wang. "Thermal Degradation Behavior of Epoxy Resin Containing Modified Carbon Nanotubes." Polymers 13, no. 19 (2021): 3332. http://dx.doi.org/10.3390/polym13193332.

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Via the surface-grafting of carbon nanotubes (CNTs) with a silicon-containing flame retardant (PMDA), a novel flame retardant CNTs-PMDA was synthesized. The flame retardancy was tested by cone calorimeter. Compared with pure epoxy resin, the total heat release (THR) and peak heat release rate (PHRR) of epoxy resin containing CNTs-PMDA were significantly reduced, by 44.6% and 24.6%, respectively. Furthermore, thermal degradation behavior of epoxy resin based composite was studied by the thermogravimetric analysis with differences in heating rates. The kinetic parameters of the thermal degradati

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Pethe, R. G., C. M. Carlin, H. H. Patterson, and W. N. Unertl. "Effect of dose stoichiometry on the structure of vapor-deposited polyimide thin films." Journal of Materials Research 8, no. 12 (1993): 3218–28. http://dx.doi.org/10.1557/jmr.1993.3218.

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PMDA-ODA polyimide thin films can be formed by vapor co-deposition of the precursor molecules PMDA (pyromellitic dianhydride) and ODA (4, 4′-oxydianiline) if the resulting polyamic acid film is heated to a 473 to 573 K cure step. We have used laser Raman spectroscopy to study how dose composition, dose rate, and substrate temperature influence the properties of the resulting polyimide films. We find that only doses with excess PMDA produce high quality films. Doses with 1 : 1 stoichiometry or excess ODA produce thermally unstable films that contain imine bonds; these films decompose below 575

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Li, Dandan, Chengyang Wang, Xiaoying Yan, et al. "N-Phenyl-substituted poly(benzimidazole imide)s with high glass transition temperature and low coefficient of thermal expansion." RSC Advances 12, no. 7 (2022): 4234–39. http://dx.doi.org/10.1039/d1ra08779g.

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Wang, Ming Yi, Zhi Qiang Guo, Bu Yu Lei, and Nan Qiao Zhou. "Rheological and Thermal Behavior of Recycled PET Modified by PMDA." Advanced Materials Research 391-392 (December 2011): 688–91. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.688.

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In this work pyromellitic dianhydride (PMDA) was used as the chain extender to increase the molecular weight of the recycled poly(ethylene terephthalate) (R-PET) and improve the rheological properties of the R-PET. The reaction was performed in a Brabender torque rheometer. The rheological and thermal characterization were performed by means of a fusion index instrument and a differential scanning calorimeter (DSC ) to compare the effectiveness of the chain extending reaction of different percentages of PMDA. The experimental results showed that compared with the unmodified R-PET, the addition

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Nam, Eunkyoung, Mi Ran Moon, Jungwoo Kim, et al. "Effects of the pyromellitic dianhydride cathode interfacial layer on characteristics of organic solar cells based on poly(3-hexylthiophene-2,5-diyl) and [6,6]-phenyl C61 butyric acid methyl ester." Journal of Materials Research 25, no. 5 (2010): 866–70. http://dx.doi.org/10.1557/jmr.2010.0113.

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This study examined the performance of poly(3-hexylthiophene-2,5-diyl)(P3HT)- and [6,6]-phenyl C61 butyric acid methyl ester (PCBM)-based organic solar cells (OSCs) with a pyromellitic dianhydride (PMDA) cathode interfacial layer between the active layer and cathode. The effect of inserting the cathode interfacial layer with different thicknesses was investigated. For the OSC samples with a 0.5 nm thick PMDA layer, the power conversion efficiency (PCE) was approximately 2.77% under 100 mW/cm2 (AM1.5) simulated illumination. It was suggested that the PMDA cathode interfacial layer acts as an ex

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Oh, Seung Sik, Dong Hyun Yeo, Keun Hee Park, et al. "Performance Enhancement of Organic Solar Cells with the LiF/Al Cathode Structure by the Pyromellitic Dianhydride Layer." Advanced Materials Research 415-417 (December 2011): 1608–10. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1608.

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We reported enhanced characteristics of the organic solar cells (OSCs) using pyromellitic dianhydride (PMDA) material as cathode interfacial layer. This PMDA cathode interfacial layer was used in a bilayered structure consisting of lithium fluoride (LiF) and pyromellitic dianhydride (PMDA) at the interface of poly(3-hexylthiophene-2,5-diyl)(P3HT)+[6,6]-phenyl C61 butyric acid methyl ester (PCBM) and Al. Better performance enhancement compared to OSCs without a cathode interfacial layer or with a single LiF interfacial layer was achieved by using a bilayered interfacial structure. The OSC with

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Cho, Yu-Jin, Dong-Min Kim, In-Ho Song, et al. "An Oligoimide Particle as a Pickering Emulsion Stabilizer." Polymers 10, no. 10 (2018): 1071. http://dx.doi.org/10.3390/polym10101071.

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A pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA)-based oligoimide (PMDA-ODA) was synthesized by a one-step procedure using water as a solvent. The PMDA-ODA particles showed excellent partial wetting properties and were stably dispersed in both water and oil phases. A stable dispersion was not obtained with comparison PMDA-ODA particles that were synthesized by a conventional two-step method using an organic solvent. Both oil-in-water and water-in-oil Pickering emulsions were prepared using the oligoimide particles synthesized in water, and the size of the emulsion droplet was cont

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Park, Jong-Hun, Ji-Hwan Lee, and Aloysius Soon. "Organics on oxidic metal surfaces: a first-principles DFT study of PMDA and ODA fragments on the pristine and mildly oxidized surfaces of Cu(111)." Physical Chemistry Chemical Physics 18, no. 31 (2016): 21893–902. http://dx.doi.org/10.1039/c6cp03249d.

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Using van der Waals corrected density-functional theory calculations, we study the fundamental physico-chemical properties of the molecular fragments of pyromellitic dianhydride oxydianiline (PMDA–ODA) on pristine and oxidized Cu(111) to investigate the effect of mild oxidation of the metal substrate on PMDA–ODA adsorption.

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Yang, Yanhua, Jing-Cheng Xia, Youxuan Zheng, Yingzhong Shen, and Gaozhang Gou. "Synthesis and non-volatile electrical memory characteristics of triphenylamine-based polyimides with flexibility segments." New Journal of Chemistry 42, no. 23 (2018): 19008–19. http://dx.doi.org/10.1039/c8nj04103b.

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Two triphenylamine-based polyimides (PI(TPA-PMDA) and PI(TPA-BPDA)) containing a flexibility segments were prepared. The memory device of ITO/PI(TPA-PMDA)/Al exhibited write-once read-many-times (WORM) memory behavior, however, the memory device of PI(TPA-BPDA) demonstrated flash-type memory characteristics.

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Tan, Yao-yao, Yan Zhang, Gang-lan Jiang, et al. "Preparation and Properties of Inherently Black Polyimide Films with Extremely Low Coefficients of Thermal Expansion and Potential Applications for Black Flexible Copper Clad Laminates." Polymers 12, no. 3 (2020): 576. http://dx.doi.org/10.3390/polym12030576.

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In the current work, a series of black polyimide (PI) films with excellent thermal and dimensional stability at elevated temperatures were successfully developed. For this purpose, two aromatic diamines including 4,4′-iminodianline (NDA) and 2-(4-aminophenyl)-5- aminobenzimidazole (APBI) were copolymerized with pyromellitic dianhydride (PMDA) to afford PIs containing imino groups (–NH–) in the molecular structures. The referenced PI film, PI-ref, was simultaneously prepared from PMDA and 4,4′-oxydianiline (ODA). The introduction of imino groups endowed the PI films with excellent blackness and

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Papadopoulou, Evie L., Davide Morselli, Mirko Prato, Alessandro Barcellona, Athanassia Athanassiou, and Ilker S. Bayer. "An efficient pure polyimide ammonia sensor." Journal of Materials Chemistry C 4, no. 33 (2016): 7790–97. http://dx.doi.org/10.1039/c6tc02375d.

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PMDA–ODA polyimide, broadly known as Kapton, solution-cast coatings cured at low temperatures, act as ammonia sensors. Detection and quantification of ammonia (NH<sub>3</sub>) vapours from ammonia solutions of different molarities. A device is presented, demonstrating the real-time detection of ammonia vapors by the PMDA–ODA coatings.

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Garreto, Maria, Gaspar Gonzalez, Antonio Ramos, and Elizabete Lucas. "Looking for a Model Solvent to Disperse Asphaltenes." Chemistry & Chemical Technology 4, no. 4 (2010): 317–23. http://dx.doi.org/10.23939/chcht04.04.317.

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Petroleum could be seen as a system of asphaltenes dispersed in other petroleum components. The petroleum components excluding the asphaltenes are referred to in this paper as Petroleum Medium that Disperses the Asphaltenes – PMDA). This paper proposes a methodology to determine solubility parameter of the PMDA by identifying a model solvent which, when added to the petroleum, does not affect the asphaltenes phase behavior. In order to achieve such objective the asphaltenes precipitation onset (PO) of the petroleum was determined, followed by the identification of a solvent mixture which, when

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Hasegawa, Masatoshi, Katsuki Ichikawa, Shuichi Takahashi, and Junichi Ishii. "Solution-Processable Colorless Polyimides Derived from Hydrogenated Pyromellitic Dianhydride: Strategies to Reduce the Coefficients of Thermal Expansion by Maximizing the Spontaneous Chain Orientation Behavior during Solution Casting." Polymers 14, no. 6 (2022): 1131. http://dx.doi.org/10.3390/polym14061131.

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In this study, practically useful colorless polyimides (PIs) with low coefficients of thermal expansion (CTEs) and other desirable properties were prepared from hydrogenated pyromellitic dianhydride (1-exo,2-exo,4-exo,5-exo-cyclohexanetetracarboxylic dianhydride, H-PMDA). A modified one-pot polymerization method afforded a high-molecular-weight PI with sufficient film-forming ability from 2,2′-bis(trifluoromethyl)benzidine (TFMB) with a rod-like structure and H-PMDA. However, the PI film cast from its homogeneous solution did not have low CTEs, similar to the analogous system using meta-tolidi

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Sudsakorn, Sirimas, Praveen Bahadduri, Jennifer Fretland, and Chuang Lu. "2020 FDA Drug-drug Interaction Guidance: A Comparison Analysis and Action Plan by Pharmaceutical Industrial Scientists." Current Drug Metabolism 21, no. 6 (2020): 403–26. http://dx.doi.org/10.2174/1389200221666200620210522.

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Background: In January 2020, the US FDA published two final guidelines, one entitled “In vitro Drug Interaction Studies - Cytochrome P450 Enzyme- and Transporter-Mediated Drug Interactions Guidance for Industry” and the other entitled “Clinical Drug Interaction Studies - Cytochrome P450 Enzyme- and Transporter-Mediated Drug Interactions Guidance for Industry”. These were updated from the 2017 draft in vitro and clinical DDI guidance. Methods: This study is aimed to provide an analysis of the updates along with a comparison of the DDI guidelines published by the European Medicines Agency (EMA)

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Chen, Jin Qing, Hong Ling Lv, Ya Qi Yao, and Bing Chen. "Pervaporation Separation of Cyclopentadiene/Methylcyclopentadiene Mixtures from Cracking C5 Fractions Using Polyimide Membranes." Advanced Materials Research 1096 (April 2015): 397–401. http://dx.doi.org/10.4028/www.scientific.net/amr.1096.397.

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Polyimide membrane pervaporation was introduced to separate the costly diene mixtures of cyclopentadiene/methylcyclopentadiene (CPD/MCPD) from cracking C5 fractions. Four kinds of membrane solutions were prepared and two kinds of polyimide homogenous membranes were fabricated by thermal imidizations using the dianhydrides (BPADAand PMDA) and the diamines (ODA and DDS). The effect of the casting solutions viscosity on the membrane formation was revealed, and the formation of functional groups and the synthesis mechanisms of the thermal imidizations were indicated by FT-IR. The adsorption behavi

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Payne, Margaret E., Katelyn P. Goetz, Cynthia S. Day, and Oana D. Jurchescu. "The 1:1 charge-transfer complex dibenzotetrathiafulvalene–pyromellitic dianhydride (DBTTF–PMDA)." Acta Crystallographica Section E Structure Reports Online 70, no. 8 (2014): o844—o845. http://dx.doi.org/10.1107/s1600536814013324.

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The title charge-transfer (CT) complex, C10H2O6·C14H8S4, composed of donor dibenzotetrathiafulvalene (DBTTF) and acceptor pyromellitic dianhydride (PMDA), forms a mixed stacking pattern along the [-110] direction. The constituent molecules occupy crystallographic inversion centers. They are nearly parallel and lieca.3.41 Å from each other. The crystals exhibit a high degree of donor/acceptor overlap [88.20 (4)%] in the long direction of the DBTTF and PMDA molecules as compared with 51.27 (5)% in the shortest direction of the molecules.

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Mishchenko, A. S., and N. Nagaosa. "Quasi-Degenerate Self-Trapping and its Application to Anthracene-PMDA: Phenomenon, Optical Absorption and Luminescence Time-Resolved Spectroscopy." International Journal of Modern Physics B 15, no. 28n30 (2001): 3673–76. http://dx.doi.org/10.1142/s0217979201008408.

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The self-trapping by the nondiagonal particle-phonon interaction between two quasi-degenerate energy levels of exitonic subsystem, is studied. We propose this is realized in charge transfer exciton, where the directions of the poralization give the quasi-degeneracy, as in quasi-one-dimensional compound A-PMDA. We present a quantitative theory for the optical properties (light absorption and time-resolved luminescence) of the resonating states, which gives a consistent resolution for the long-standing puzzles in A-PMDA.

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Bayati, Mohamed, Haiming Peng, Heng Deng, Jian Lin, and Maria Fidalgo. "Graphene Coated Microfiltration Ceramic Membrane Fabricated by Photothermic Conversion of Polyimide." MRS Advances 2, no. 46 (2017): 2489–95. http://dx.doi.org/10.1557/adv.2017.398.

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ABSTRACTIn this study, a novel technique has been developed for the fabrication of uniform, stable, and strongly bonded graphene layers on microporous ceramic membranes. A composite ceramic-LIG membrane was obtained following one step scalable methodology. First, the ceramic support was spin-coated with poly (pyromellitic dianhydrideco-4,4´-oxidianiline, amic acid) (PMDA-ODA) and transformed to polyimide (PI) by thermal imidization. The PI was then irradiated with a CO2 laser to photothermally convert the sp3-carbon atoms to sp2-carbon atoms. Different PMDA-ODA layers were applied to achieve u

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Zhang, Bing, Yi Shi, Yong Hong Wu, Yun Hua Lu, and Tong Hua Wang. "Preparation and Characterization of CNT/C Composite Membranes from 6FAPB-PMDA Type Polyimide." Advanced Materials Research 726-731 (August 2013): 691–94. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.691.

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A novel precursor, 6FAPB-PMDA type polyimide, was developed to prepare carbon membranes and carbon nanotube (CNT) composite carbon membranes. The thermal stability of precursors was characterized by TGA. The morphology of carbon membrane was observed by SEM. The microstructure was measured by XRD and nitrogen adsorption technique. Results have shown that 6FAPB-PMDA type polyimide is a promising precursor, and the introduction of CNT can obviously modify the thermal stability, as well as the carbon and porous structure of resultant carbon membranes.

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Nagai, Sumimasa. "The Comparison of Review Processes of Hematological Malignancy Drugs Between the Pmda and the FDA." Blood 120, no. 21 (2012): 4243. http://dx.doi.org/10.1182/blood.v120.21.4243.4243.

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Abstract Abstract 4243 Background: Both the Pharmaceuticals and Medical Devices Agency (PMDA) in Japan and the US Food and Drug Administration (FDA) review drug applications for market approval. In 1992, the FDA instituted accelerated approval (AA) regulations based on surrogate endpoints including response rate, and it allows distribution of drugs for serious diseases before granting regular approval (RA) based on confirmed clinical benefit including improved survival. The PMDA has not adopted such regulations. Differences in the total review time and the approval date of drug applications be

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Madsen, Milene Torp, Lars Rauff Skadhauge, Anders Daldorph Nielsen, Jesper Baelum, and David Lee Sherson. "Pyromellitic dianhydride (PMDA) may cause occupational asthma." Occupational and Environmental Medicine 76, no. 3 (2019): 175–77. http://dx.doi.org/10.1136/oemed-2018-105295.

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IntroductionAnhydrides are widely used as cross-linking agents in epoxy resins and alkyd production, for example, as coatings and adhesives in plastic products. Sensitisation to several anhydrides is known to cause occupational asthma. There are indications that the lesser known pyromellitic dianhydride (PMDA) can cause irritative respiratory symptoms and possibly asthma. We report three cases of workers from a plastic foil manufacturing plant, who developed asthma when exposed to PMDA during specific inhalation challenge (SIC).MethodsSIC was performed over 2 days according to recommendations

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Zhao, Limin, Huimin Liu, Yue Du, et al. "An ionic liquid as a green solvent for high potency synthesis of 2D covalent organic frameworks." New Journal of Chemistry 44, no. 36 (2020): 15410–14. http://dx.doi.org/10.1039/d0nj01478h.

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Thiele, Kerstin, Nicole Eversmann, Andreas Krombholz, and Daniela Pufky-Heinrich. "Bio-Based Epoxy Resins Based on Linseed Oil Cured with Naturally Occurring Acids." Polymers 11, no. 9 (2019): 1409. http://dx.doi.org/10.3390/polym11091409.

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Structural properties of resins based on epoxidized linseed oil (ELO) were investigated in reference to varying amounts of the hardener components methyltetrahydrophthalic anhydride (MTHPA), pyromellitic dianhydride (PMDA) and maleic acid (MA). This includes gel time and the Shore A and D hardness. The shortest gel time of 0.9 min and the highest Shore A and D hardness of 85 and 34 were found at a nMTHPA/nPMDA/nMA molar ratio of 8/1/8. To study the effect of the ELO mass on gel time and hardness, different masses of ELO (8, 10, 12, 14 and 16 g) were used, keeping the amount of the hardener sys

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Zhang, Panpan, Ke Zhang, Shuliang Dou, Jiupeng Zhao, Xiangqiao Yan, and Yao Li. "Mechanical, Dielectric, and Thermal Attributes of Polyimides Stemmed Out of 4, 4’–Diaminodiphenyl Ether." Crystals 10, no. 3 (2020): 173. http://dx.doi.org/10.3390/cryst10030173.

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Several kinds of polyimide (PI) films stemmed out of 4, 4’–diaminodiphenyl ether, as well as various structurally various aromatic dianhydride, were prepared. The films’ mechanical, dielectric, and dynamic mechanical attributes were put under investigation. According the findings, the PI films’ performance is significantly different as a result of their diverse structure. PI’s dielectric constant and dielectric loss tangent of abides by the increasing order below: PMDA-PI>BTDA-PI>BPDA-PI. Moreover, the electric breakdown strength of BTDA-PI (478.90 kV/mm) presents a lot higher value comp

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Takeichi, Tsutomu, Kohji Nakajima, Min Zuo, and Rikio Yokota. "Polyimide/Polyimide Molecular Composite Films: Difference between Reactive Oligoimide and Reactive Polyimide as the Matrix Component." High Performance Polymers 10, no. 1 (1998): 111–20. http://dx.doi.org/10.1088/0954-0083/10/1/012.

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Polyimide/polyimide molecular composite (MC) films were prepared by blending precursor solutions of a rigid polyimide and a reactive oligoimide or a reactive polyimide that contains acetylene units in the backbone in a 7:3 ratio, followed by casting, drying and thermal imidization at 300 °C. 3, 3′, 4, 4′-Biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA), p-phenylenediamine (PDA), oxydianiline (ODA) and 3, 3′-diaminodiphenylacetylene ( m-intA) were used as acid dianhydride and diamine monomers for the preparation of polyimide. The rigid components were prepared from PM

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El-Shamy, Moustafa M., Hassan M. Emara, and Mona E. Mohamed. "Virulence Analysis of Wheat Powdery Mildew (Blumeria graminis f. sp. tritici) and Effective Genes in Middle Delta, Egypt." Plant Disease 100, no. 9 (2016): 1927–30. http://dx.doi.org/10.1094/pdis-01-16-0130-re.

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Wheat powdery mildew (Blumeria graminis f. sp. tritici) has increased in Delta Egypt in recent years as a result of growing susceptible cultivars of bread wheat. Fifty-two isolates of B. graminis f. sp. tritici collected in 2013 and 2014 from commercial fields in five provinces were analyzed for virulence, using 21 genes conferring resistance to powdery mildew (Pm genes) as well as 12 local wheat cultivars. First true leaves of 10-day-old wheat differentials were inoculated with isolates derived from a single pustule of B. graminis f. sp. tritici. No virulence to the resistance genes Pm3d, Pm1

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Vorobyova, L. D., T. V. Korotaeva, S. I. Glukhova, E. Yu Loginova, E. E. Gubar, and Yu L. Korsakova. "Search for predictors of achieving minimal disease activity during tofacitinib therapy in patients with psoriatic arthritis." Modern Rheumatology Journal 17, no. 6 (2023): 38–43. http://dx.doi.org/10.14412/1996-7012-2023-6-38-43.

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Objective: to search predictors of achieving minimal disease activity (MDA) during therapy in patients with psoriatic arthritis (PsA).Materials and methods. The study included 41 patients, predominantly men (58.9 %), with a confirmed PsA diagnosis and a disease duration of at least 6 months. In all cases, the diagnosis fulfilled the CASPAR criteria. The mean age of the patients at the time of enrolment in the study was 43.0±10.1 years, the duration of PsA was 7.7±7.1 years, the duration of psoriasis was 18.6±10.4 years, and the DAPSA index was 44.2±17.1. All patients were prescribed tofacitini

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Härth, Michael, and Andrea Dörnhöfer. "Film Blowing of Linear and Long-Chain Branched Poly(ethylene terephthalate)." Polymers 12, no. 7 (2020): 1605. http://dx.doi.org/10.3390/polym12071605.

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Film blowing of Poly(ethylene terephthalate) (PET) is challenging due its inherently low melt viscosity and poor melt strength. In this study, it is shown how the rheological properties of a commercial PET can be altered by reactive extrusion using either pyromellitic dianhydride (PMDA) or a multifunctional epoxy (Joncryl® ADR 4368) as chain extender, in order to improve the processing behavior during film blowing. The modified materials were characterized by shear and elongation rheometry and relevant processing characteristics, like melt pressure, bubble stability, and film thickness uniform

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Caldera, Fabrizio, Antonella Moramarco, Federico Cesano, Anastasia Anceschi, Alessandro Damin, and Marco Zanetti. "Preparation and Carbonization of Glucose and Pyromellitic Dianhydride Crosslinked Polymers." C 7, no. 3 (2021): 56. http://dx.doi.org/10.3390/c7030056.

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In this work, four types of nanosponges were prepared from pyromellitic dianhydride (PMDA) and D-glucose (GLU) with different molar ratios (1.5:1, 2:1, 2.5:1 and 3:1). The obtained PMDA/GLU nanosponges were then pyrolyzed at 800 °C for 30 min under N2 gas flow. The prepared polymeric nanosponges were investigated by FTIR spectroscopy, elemental and thermogravimetric analyses to unravel the role played by the different molar ratio of the precursors in the formation of the polymer. The pyrolyzed nanosponges were investigated by means of porosity measurements, X-ray diffraction analysis, Raman sp

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Ree, M., H. Han, and C. C. Gryte. "Water sorption in thin films of high-temperature polyimides: the effect of imidization history." High Performance Polymers 6, no. 4 (1994): 321–33. http://dx.doi.org/10.1088/0954-0083/6/4/003.

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PMDA-ODA and BPDA-PDA polyimides in 10-50 Atrn thick films were prepared from the respective poly(amic acid) precursor by thermal imidization for 1-10 h at various temperatures over 230-400C. Their water sorption behaviours were studied in detail by gravimetry. Water sorption in both PMDA-ODA and BPDA-PDA followed a nearly Fickian process in spite of the morphological heterogeneity due to the ordered and less ordered phases. Water clustering or plasticization was very weakly evident on the water uptake versus humidity plots. Water sorption in both polyimides was highly dependent upon imidizati

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NAKAMURA, Ryuta. "Relation of clinical development and PMDA." Japanese Journal of Thrombosis and Hemostasis 26, no. 4 (2015): 376–84. http://dx.doi.org/10.2491/jjsth.26.376.

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Sakurai, Jun. "PMDA (Pharmaceuticals and Medical Devices Agency)." Okayama Igakkai Zasshi (Journal of Okayama Medical Association) 126, no. 3 (2014): 249–52. http://dx.doi.org/10.4044/joma.126.249.

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Neyertz, Sylvie, David Brown, Michiel J. T. Raaijmakers, and Nieck E. Benes. "The influence of the dianhydride precursor in hyper-cross-linked hybrid polyPOSS-imide networks." Physical Chemistry Chemical Physics 18, no. 41 (2016): 28688–703. http://dx.doi.org/10.1039/c6cp06184b.

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Song, In-Ho, Dong-Min Kim, Ju-Young Choi, et al. "Polyimide-Based PolyHIPEs Prepared via Pickering High Internal Phase Emulsions." Polymers 11, no. 9 (2019): 1499. http://dx.doi.org/10.3390/polym11091499.

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Pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) oligoimide particles and PMDA-ODA poly(amic acid) salt (PAAS) were synthesized and used as stabilizers to prepare oil-in-water Pickering high internal phase emulsions (HIPEs). The stability of the Pickering HIPEs was investigated by dispersion stability analysis. Polyimide-based polyHIPEs could be prepared through freeze-drying and subsequent thermal imidization of the Pickering HIPEs. The characteristics of the polyHIPEs, including their morphology, porosity, thermal decomposition temperature, and compression modulus, were investigat

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Новиков, Д. В. "Текстура поверхности и корреляции плотность-плотность в пленках адамантансодержащих полиимидов и сополиимидов". Физика твердого тела 59, № 5 (2017): 1006. http://dx.doi.org/10.21883/ftt.2017.05.44393.228.

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По данным электронной микроскопии изучены пространственные корреляции наночастиц золота, полученных вакуумным термическим напылением металла на активированную бромом поверхность пленок адамантансодержащих полиимидов и сополиимидов на основе пиромеллитового ангидрида (PMDA), 4,4'-оксидианилина (ODA) и 1-аминоэтил-3-(4'-аминофенил)адамантана (AEAPhA), а также диангидрида 3,4,3',4'-тетракарбоксидифенилоксида (ODPA), ODA и AEAPhA при вариации соотношения фрагментов ODA и AEAPhA. Показано, что с ростом отношения мольных долей [AEAPhA]/[ODA] изменяются текстура поверхности пленок, свободный объем, к

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Aversa, Raffaella, Relly Victoria Virgil Petrescu, Antonio Apicella, and Florian Ion Tiberiu Petrescu. "A method for pet mechanical properties enhancement." Independent Journal of Management & Production 10, no. 8 (2019): 1725. http://dx.doi.org/10.14807/ijmp.v10i8.940.

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A method for PET mechanical properties enhancement by reactive blending with HBA/HNA Liquid Crystalline Polymers for in situ highly fibrillar composites preparation is presented. LCP/PET blends were reactively extruded in presence of Pyromellitic Di-Anhydride (PMDA) and then characterized by Differential Scanning Calorimetry, Thermally Stimulated Currents and tensile mechanical properties. Moderate amounts of LCP in the PET (0.5 and 5%) and small amounts of thermo-active and reactive compatibilizer in the blend (0.3%) were found to significantly improve LCP melt dispersion, melts shear transfe

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Li, Quantao, Pengcheng Zhu, Yanjin Zhu, JianFei Wang, Wenqiu Chen, and Zushun Xu. "Preparation and Properties of Graphene/ODA-PMDA-NTADA Copolyimide Nanocomposites Based onKH550-modification." Journal of Physics: Conference Series 2639, no. 1 (2023): 012039. http://dx.doi.org/10.1088/1742-6596/2639/1/012039.

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Abstract In this study, KH550-modified graphene/ODA-PMDA-NTADA copolyimide nanocomposites were successfully made in an organic medium using KH-550 chemically modified reduced graphene oxide (rGO-NH2) as a multi-functional comonomer combinied with commercially available ODA, PMDA, and NTADA monomers, and their dispersive, morphological, thermal, viscous, conductive properties were investigated. Compared to pure PI, the dispersion compatibility, thermal characteristics and electrical conductivity of the produced nanocomposites were improved significantly. The improved rGO/PI nanocomposites showe

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Tamai, S., W. Yamashita, and A. Yamaguchi. "Processable Poly(Keto-Imide)s Having Bulky Pendent Ether Groups." High Performance Polymers 10, no. 1 (1998): 1–10. http://dx.doi.org/10.1088/0954-0083/10/1/002.

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1, 3-Bis(3-aminobenzoyl)benzene (BAB), 1, 3-bis(3-amino-4-phenoxybenzoyl)benzene (BAPB) and 1, 3-bis(3-amino-4-biphenoxybenzoyl)benzene (BABB) were synthesized from 1, 3-bis(3-nitro-4-chlorobenzoyl)benzene. By using these three diamines and commercially available tetracarboxylic dianhydrides such as 3, 3′, 4, 4′-benzophenone tetracarboxylic dianhydride (BTDA) and pyromellitic dianhydride (PMDA), several kinds of poly(keto-imide)s were synthesized. Thermal properties and processability such as melt-flowability and solubility in organic solvents of the obtained poly(keto-imide)s were investigate

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Jiang, Guo, Jian Feng, Mengdi Zhang, Shuidong Zhang, and Hanxiong Huang. "Structure, and thermal and mechanical properties of poly(propylene carbonate) capped with different types of acid anhydride via reactive extrusion." RSC Advances 6, no. 109 (2016): 107547–55. http://dx.doi.org/10.1039/c6ra18713g.

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Xu, Hang, Chuanqiang Yin, Xinran Hou, et al. "Polyimide-derived carbon nanofiber membranes as free-standing anodes for lithium-ion batteries." RSC Advances 12, no. 34 (2022): 21904–15. http://dx.doi.org/10.1039/d2ra03368b.

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Free-standing and flexible carbon nanofiber membranes (CNMs) with a three-dimensional network structure were fabricated based on PMDA/ODA polyimide by combining electrospinning, imidization, and carbonization strategies.

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