Synthesis and Characterization of Phosphorus Containing Poly(arylene ether)s
The synthesis and characterization of phosphorus containing poly(arylene ether)s were investigated to determine the effect of phosphorus upon the thermal stability, mechanical strength, and fire resistance of thermoplastics. Phosphorus containing activated aromatic dihalides and bisphenols were...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Others |
| Published: |
Virginia Tech
2014
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10919/29824 http://scholar.lib.vt.edu/theses/available/etd-11569282975860/ |
| Summary: | The synthesis and characterization of phosphorus
containing poly(arylene ether)s were investigated to
determine the effect of phosphorus upon the thermal
stability, mechanical strength, and fire resistance of
thermoplastics. Phosphorus containing activated
aromatic dihalides and bisphenols were synthesized in
high purity. These monomers were successfully
polymerized via nucleophilic aromatic substitution to
afford high molecular weight polymers. It was
determined that by incorporating the phosphine oxide
moiety into the polymer backbone certain properties
of the resulting poly(arylene ether)s were substantially
improved, such as an increase in Tg, thermal stability
in air, modulus, and char yield, compared with control
poly(arylene ether sulfone)s. The high char yields
obtained for these polymers in air, along with
observed intumescence indicates that these materials
have improved fire resistance. Preliminary cone
calorimetry measurements support this conclusion. In
addition, the phosphine oxide group in the backbone
was reduced to a phosphine and successfully
converted to a phosphonium bromide ionomer. The
resulting system was further chemically modified to
ionically bond second-order nonlinear optical
chromophores to the backbone of selected
poly(arylene ether)s. Initial results on corona poling of
cast film at low temperature produced stable second
harmonic generation in these materials, indicating that
they may have promise in nonlinear optical
applications. === Ph. D. |
|---|