structural analysis of aromatic liquid crystalline polyesters芳香族高分子液晶聚酯的结构分析.pdf

Polymers 2011, 3, 367-387; doi:10.3390/polym3010367 OPEN ACCESS polymers ISSN 2073-4360 /journal/polymers Article Structural Analysis of Aromatic Liquid Crystalline Polyesters Henry Hall 1,* Samiul Ahad 1, Robert Bates 1, Maria Bertucci 2, Cristina Contreras 1, , 1 1 2 1 Alexandru Dospinoiu , Guangxin Lin , Nancy Singletary and Arpad Somogyi 1 Department of Chemistry and Biochemistry, University of Arizona, 1306 E University Blvd, Tucson, AZ 85721, USA; E-Mails: batesr@ (R.B.); ccontre1@ (C.C.); glin@ (G.L.); asomogyi@ (A.S.) 2 Solvay Advanced Polymers, 4500 McGinnis Ferry Rd., Alpharetta, GA 30005, USA; E-Mails: maria.bertucci@ (M.B.); nancy.singletary@ (N.S.) * Author to whom correspondence should be addressed; E-Mail: hkh@; Tel.: +01-520-621-6326; Fax: +01-520-621-8407. Received: 21 December 2010; in revised form: 13 January 2011 / Accepted: 20 January 2011 / Published: 27 January 2011 Abstract: Laboratory preparations of liquid crystalline prepolymers, distillates accompanying prepolymers, final polymers, and sublimates accompanying final polymers were examined. NaOD/D2O depolymerization of prepolymers and polymers back to monomers with integration of the 1H NMR spectra showed up to 6% excess of carboxyls over phenol groups, caused partly by loss of the low-boiling comonomer hydroquinone through distill