DOPO 在 PA, PVA etc

Research Article
Reversibility of hydration and dehydration reactions of a phosphaphenanthrene oxide (DOPO) pendent group on polyamide
Ying-Ling Liu 1 *, Wen-Lung Wei 1, Wen-Yu Chen 2
1Department of Chemical Engineering and R&D Centre for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan, ROC
2Chung San Institute of Science and Technology, Lungtan, Taoyuan 323, Taiwan, ROC
*Correspondence to Ying-Ling Liu, Department of Chemical Engineering and R&D Centre for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan, ROC
Keywords
polyamide phosphorus hydration
Abstract
The cyclic phosphorous group,
9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-10-yl (DOPO), attached on a polyamide PA-DOPO could be hydrated to give its open-chained form with phosphinic acid groups (PA-DOPO-HD). The open-chained phosphinic acid groups could be reformed to its cyclic DOPO form through thermal dehydration. The occurrence of the hydration and thermal-dehydration reactions and the chemical structure of the polyamides were demonstrated with FTIR, 31P NMR, and thermal analysis. PA-DOPO-HD exhibited similar inherent viscosity and better organosolubility than the original polyamide PA-DOPO. Copyright © 2003 Society of Chemical Industry
Novel approach to the chemical modification of poly(vinyl alcohol): Phosphorylation
Ying-Ling Liu *, Yie-Chan Chiu
Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan, 320, Taiwan, Republic of China email: Ying-Ling Liu (ylliu@.tw)
*Correspondence to Ying-Ling Liu, Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan, 320, Taiwan, Republic of China
Keywords
modification thermal properties flame retardance
Abstract
The chemical modification of poly(vinyl alcohol) (PVA) was performed through oxidation followed by nucleophilic addition. PVA was oxidized by KMnO4 to form vinyl ketone units along the polymer backbone. The chemical modification of PVA was then conducted through the reaction of the carbonyl group of the vinyl ketone unit with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as a nucleophile. Through this approach, the phosphorous DOPO group was attached onto the carbon atom of the polymer main chain rather than onto the pendent hydroxyl groups of PVA. The formed DOPO-containing PVA showed improved thermal stability, organosolubility, and flame retardance. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1107-1113, 2003
Synthesis and properties of new phosphorus-containing poly(ester-imide)s Tachita Vlad-Bubulac *, Corneliu Hamciuc, Oana Petreus, Maria Bruma
Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania
*Correspondence to Tachita Vlad-Bubulac, Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania.
8th International Symposium on Polymer for Advanced Technologies 2005 (PAT 2005), Budapest, 13-16 September, 2005, Part 1
KEYWORDS
poly(ester-imide)s phosphorus-containing polymers polycondensation thermal properties glass transition
ABSTRACT
New phosphorous-containing poly(ester-imide)s have been prepared by polycondensation in solution at high temperature of a p-hydroxyphenol containing phosphorus, namely
2-(6-oxid-6H-dibenz<c,e><1,2>oxaphosphorin-6-yl)-1,4-benzenediol, with various aromatic diacide chlorides containing preformed imide rings. The polymers were easily soluble in polar organic solvents, such as N-methylpyrrolidone,
N,N-dimethylformamide, tetrahydrofuran and chloroform. They showed high thermal stability, the decomposition temperature being above 360
DC and the glass transition in the temperature range 142-223DC. One of these polymers exhibited thermotropic liquid crystalline behavior. Solutions of the phosphorous-containing poly(ester-imide)s in N,N-dimethylformamide showed fluorescence having a maximum emission wavelength in the range 376-378 nm. Due to the presence of phosphorus the polymers gave high char yield in thermogravimetric analysis. Copyright © 2006 John Wiley & Sons, Ltd.。