Microwave-assisted Synthesis, Crystal Structures, and Thermal Stability of C11 H10 N2 Cu2 Br3 and C22 H20 N4 Cu8 I10

2018 ◽  
Vol 644 (24) ◽  
pp. 1754-1759
Author(s):  
Min Deng ◽  
Yuandong Wu ◽  
Pinhua Rao ◽  
Wenqi Zhang ◽  
Runkai Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Crystal Structures ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Thermal Stability Of

scholarly journals Microwave-assisted synthesis of high thermal stability and colourless polyimides containing pyridine

2019 ◽  
Vol 6 (6) ◽  
pp. 190196 ◽  
Author(s):  
Kai Cheng ◽  
Jie-pin Hu ◽  
Yan-cheng Wu ◽  
Chu-qi Shi ◽  
Zhi-geng Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Synthesis Method ◽  
Optical Transmittance ◽  
Aromatic Diamine ◽  
Microwave Assisted Synthesis ◽  
Step Method ◽  
Light Emitting ◽  
Microwave Assisted ◽  
One Step ◽  
Biphenyltetracarboxylic Dianhydride

A novel aromatic diamine containing pyridyl side group, 4-pyridine-4,4-bis(3,5-dimethyl-5-aminophenyl)methane (PyDPM), was successfully synthesized via electrophilic substitution reaction. The polyimides (PIs) containing pyridine were obtained via the microwave-assisted one-step polycondensation of the PyDPM with pyromellitic dianhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 3,3′,4,4′-diphenylether tetracarboxylic dianhydride (ODPA) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). Contrarily to the reported similar PIs, these PIs exhibit much higher thermal stability or heat resistance, i.e. high glass transition temperatures ( T g s) in the range of 358–473°C, and the decomposition temperatures at 5% weight loss over 476°C under nitrogen. They can afford flexible and strong films with tensile strength of 82.1–93.3 MPa, elongation at break of 3.7%–15.2%, and Young's modulus of 3.3–3.8 GPa. Furthermore, The PI films exhibit good optical transparency with the cut-off wavelength at 313–366 nm and transmittance higher than 73% at 450 nm. The excellent thermal and optical transmittance can be attributed to synthesis method and the introduction of pyridine rings and ortho-methyl groups. The inherent viscosities of PIs via one-step method were found to be 0.58–1.12 dl g −1 in DMAc, much higher than those via two-step method. These results indicate these PIs could be potential candidates for optical substrates of organic light emitting diodes (OLEDs).

Laddersiloxanes: Silsesquioxanes with Defined Ladder Structure

2007 ◽  
Vol 1007 ◽  
Author(s):  
Masafumi Unno
Keyword(s):  
Thermal Stability ◽  
Ir Spectra ◽  
Crystal Structures ◽  
Ladder Structure ◽  
X Ray ◽  
Stepwise Procedure ◽  
Thermal Stability Of

ABSTRACTA series of structurally-defined laddersiloxanes [1] are presented. Pentacyclic laddersiloxanes were prepared by a stepwise procedure from all-cis-tetraisopropylcyclotetrasiloxanetetraol. All-anti pentacyclic, tetracyclic, tricyclic, and bicyclic laddersiloxanes were obtained by oxidation from respecting all-anti pentacyclic ladder polysilane. Stereocontrolled approach using RS-disiloxanediol as an expanding unit enabled the synthesis of longer laddersiloxanes. Finally, methyl-substituted ladder polysilsesquioxane was obtained by the stepwise transformation from (MePhSiO) 4. The X-ray crystal structures, NMR and IR spectra, and thermal stability of these laddersiloxanes are summarized.

Improving thermal stability of KSrPO4:Tb3+ phosphors prepared by microwave assisted sintering

2013 ◽  
Vol 35 (12) ◽  
pp. 2102-2106 ◽  
Author(s):  
Yu-Ming Peng ◽  
Yan-Kuin Su ◽  
Ru-Yuan Yang
Keyword(s):  
Thermal Stability ◽  
Microwave Assisted ◽  
Thermal Stability Of

Microwave-Assisted Synthesis and Crystal Structures of 2-Imidazolines and Imidazoles.

ChemInform ◽  
2006 ◽  
Vol 37 (41) ◽  
Author(s):  
Antonio de la Hoz ◽  
Angel Diaz-Ortiz ◽  
Maria del Carmen Mateo ◽  
Monica Moral ◽  
Andres Moreno ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Microwave assisted synthesis and crystal structures of 2-imidazolines and imidazoles

Tetrahedron ◽  
2006 ◽  
Vol 62 (25) ◽  
pp. 5868-5874 ◽  
Author(s):  
Antonio de la Hoz ◽  
Ángel Díaz-Ortiz ◽  
María del Carmen Mateo ◽  
Mónica Moral ◽  
Andrés Moreno ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted
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