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Synthesis of Segmented Anisotropic-Isotropic Poly(Aryl Ester)Poly(Arylene Ether) Copolymers

Published online by Cambridge University Press:  21 February 2011

J. E. McGratn ,
K. L. Cooper ,
W. Waehamad ,
H. Huang  and
G. L. Wilkes
J. E. McGratn*
Affiliation:
Departments of Chemistry, Chemical Engineering and the NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
K. L. Cooper
Affiliation:
Departments of Chemistry, Chemical Engineering and the NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
W. Waehamad
Affiliation:
Departments of Chemistry, Chemical Engineering and the NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
H. Huang
Affiliation:
Departments of Chemistry, Chemical Engineering and the NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
G. L. Wilkes
Affiliation:
Departments of Chemistry, Chemical Engineering and the NSF Science and Technology Center: High Performance Polymeric Adhesives and Composites Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
*
*To whom correspondence should be addressed
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Abstract

Carboxyl functional poly(arylene ether) oligomers of controlled number average molecular weight were synthesized via nucleophilic aromatic substitution step polymerization using p-hydroxy benzoic acid as the molecular weight and end group controlling reagents. The subsequent functionalized polyarylene ethers were copolymerized with acetoxy benzoic acid or acetoxyphenoxy benzoic acid via melt acidolysis procedures. Successful copolymers were generated using chlorobenzene as a solvent for the first s age of the reaction followed by melt reaction at temperatures as high as 325°C. Resulting copolymer composition and segment size were investigated. It was possible to prepare improved solvent resistant copolymers through incorporation of the liquid crystal polyester (LCP) segment. Extraction tests using boiling chloroform showed that a high percentage of segmented copolymer were generated. Swelling characteristics were also noted and were observed to decrease as a function of the LCP concentration utilized. Multiple transitions were observed in differential scanning calorimetry consistent with Tg's, Tm's and possibly with liquid crystal transitions. Optical microscopy showed an ordered microstructure developed which is consistent with the presence of liquid crystalline phases. The materials were successfully compression molded to afford tough coherent films at all compositions, implying the likelihood of improved compressive strength relative to the LCP homo- or copolyesters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 175: Symposium S – Multifunctional Materials , 1989 , 351
Copyright
Copyright © Materials Research Society 1990

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