Formation of a [4.3.0]-Bicyclic Aluminum-Phosphorus Compound with Annulated C3P2and Al2C2PH Heterocycles and a 3c-2e Al-H-Al Bond

2013 ◽  
Vol 639 (7) ◽  
pp. 1181-1184 ◽  
Author(s):  
Werner Uhl ◽  
Steffi Roters ◽  
Alexander Hepp
Keyword(s):  
Phosphorus Compound

scholarly journals Preparation and properties of flame-retardant epoxy resins containing reactive phosphorus flame retardant

2020 ◽  
Vol 15 ◽  
pp. 155892502090132
Author(s):  
Sang-Hoon Lee ◽  
Seung-Won Oh ◽  
Young-Hee Lee ◽  
Il-Jin Kim ◽  
Dong-Jin Lee ◽  
...  
Keyword(s):  
Impact Strength ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Phosphorus Content ◽  
Phosphorus Compound ◽  
Phosphorus Compounds ◽  
Limiting Oxygen Index ◽  
The Impact

To prepare flame-retardant epoxy resin, phosphorus compound containing di-hydroxyl group (10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phospha phenanthrene-10-oxide, DOPO-HQ) was reacted with uncured epoxy resin (diglycidyl ether of bisphenol A, YD-128) and then cured using a curing agent (dicyandiamide, DICY). This study focused on the effect of phosphorus compound/phosphorus content on physical properties and flame retardancy of cured epoxy resin. The thermal decomposition temperature of the cured epoxy resins (samples: P0, P1.5, P2.0, and P2.5, the number represents the wt% of phosphorus) increased with increasing the content of phosphorus compound/phosphorus (0/0, 19.8/1.5, 27.8/2.0, and 36.8/2.5 wt%) based on epoxy resin. The impact strength of the cured epoxy resin increased significantly with increasing phosphorus compound content. As the phosphorus compound/phosphorus content increased from 0/0 to 36.8/2.5 wt%, the glass transition temperature (the peak temperature of loss modulus curve) increased from 135.2°C to 142.0°C. In addition, as the content of phosphorous compound increased, the storage modulus remained almost constant up to higher temperature. The limiting oxygen index value of cured epoxy resin increased from 21.1% to 30.0% with increasing phosphorus compound/phosphorus content from 0/0 to 36.8/2.5 wt%. The UL 94 V test result showed that no rating for phosphorus compounds less than 19.8 wt% and V-1 for 27.8 wt%. However, when the phosphorus compound was 36.8 wt%, the V-0 level indicating complete flame retardancy was obtained. In conclusion, the incorporation of phosphorus compounds into the epoxy chain resulted in improved properties such as impact strength and heat resistance, as well as a significant increase in flame retardancy.

Tetraphenylarsonium iodide, a new determination

2003 ◽  
Vol 59 (11) ◽  
pp. m484-m486 ◽  
Author(s):  
Philip A. W. Dean ◽  
Donald C. Craig ◽  
Marcia L. Scudder ◽  
Ian G. Dance
Keyword(s):  
Crystal Structures ◽  
Crystal Packing ◽  
Phosphorus Compound ◽  
Linear Chains

The reported crystal structures of Ph4P+·I− and Ph4As+·I− have been re-examined. An apparent instance of substitutional dimorphism could not be reproduced and, contrary to an earlier report, tetraphenylarsonium iodide, [As(C6H5)4]I or Ph4As+·I−, was found to be isostructural with the phosphorus compound. The cation and anion are both located on \overline 4 symmetry sites. The crystal packing involves linear chains of cations in fourfold phenyl embraces.

Dopant Sources Choice for Formation of p-Type ZnO: Phosphorus Compound Sources.

ChemInform ◽  
2005 ◽  
Vol 36 (19) ◽  
Author(s):  
Zhi Gen Yu ◽  
Hao Gong ◽  
Ping Wu
Keyword(s):  
Phosphorus Compound ◽  
P Type

Quantitative 31P-MRS Reveals Different Phosphorus Compound Contents in the Muscle between Trained and Untrained Subjects

2015 ◽  
Vol 47 ◽  
pp. 290
Author(s):  
Hideyuki Takahashi ◽  
Takuya Osawa ◽  
Yasuhiro Suzuki ◽  
Kazushige Goto ◽  
Nobukazu Kasai ◽  
...  
Keyword(s):  
Phosphorus Compound ◽  
31P Mrs
Sign in / Sign up

Export Citation Format

Share Document