PAEPO phosphine oxide

PAEPO polyarylene ether phosphine oxide PBU polybutadiene polyurethane... 

Phosphorus-containing polymers have shown excellent thermal stability and good adhesion characteristics. In addition, phosphorus-containing polymers have been found to show excellent flame retardance [66,67]. All of the synthesized poly(arylene ether phosphine oxide)s (PAEPOs) (2-45 to 2-48) (Table 2.7) [68] exhibited excellent solubility at room temperature, including polar aprotic solvents, and also in chloroform, CH2CI2, and THF. These polymers also had good solubility... 

Satpathi et al. [78] synthesized an AB2 monomer containing pendant -CF3 groups, namely bis-(4-fluoro-3-trifluoromethylphenyl)-4 -hydroxy-phenylphosphine oxide, which was self-condensed to afford fluorinated hb-poly(arylene ether phosphine oxide) (F-hb-PAEPO) (Scheme 2.19). A high molar mass of M 6,16,000 g/mol was achieved with D = 1.4. The F-hb-PAEPO was completely soluble in a wide range of organic solvents, namely CHCI3, CH2CI2, THF, NMP, DMF, DMSO, DMAc, and acetone at room temperature. 

A series of AB2 monomers, namely bis-(4-fluorophenyl)-(4-hydroxyphenyl) phosphine oxide (1-26, Scheme 10), bis-(3,4-difluorophenyl)-(4-hydroxyphenyl) phosphine oxide (1-28, Scheme 10), and 4-hydroxyphenyl-bis-(3,4,5-trifluorophenyl)phosphine oxide (1-29, Scheme 10), were synthesized and characterized by Bernal et al. [166]. The AB , monomers were self-condensed to form hb-PAEPOs according to the procedure reported by Hawker and Chu [65]. Spectral analysis of the resulting polymers indicated DB of 57% with M , ranging from 22,400 to 52,500 Da and D in the range of 2.44-3.60. The polymerization time required to achieve reasonable molecular weights was decreased from 20 h to less than 6 h and then to 4.5 h by the introduction of additional fluorine atoms to some of the monomers, and a of 33,000-22,400 Da was obtained. The hb-PAEPOs showed only a very weak endothermic baseline shift at approximately 300 C in DSC scans up to 450°C. TGA measurements of hb-PAEPOs showed high thermal stability at 545-590°C under nitrogen atmosphere and 475-480°C in air atmosphere. 

Czupik and Possum [168] prepared hb-PAEPOs via an A2 + B3 polymerizatiOTi technique with tris(4-fluorophenyl) phosphine oxide (1-30, Scheme 10) as B3 monomer, using a variety of bisphenols, namely 4,4 -isopropylidenediphenol (BPA), 4,4 - dihydroxybiphenyl (DHB), and 4,4 -dihydroxybiphenyl ether... 

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