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- Title
Synthesis and Characterization of New, Soluble and Low-κ poly(aryl ether ketone)s containing Tetramethyl and Xanthene groups in Structural Units.
- Authors
HAI-TAO DUAN; XIAO-LING LIU; XUE-CHUN MAO; ZHEN-ZHONG HUANG; SHOU-RI SHENG
- Abstract
9,9-Bis (3,5-dimethyl-4-hydroxyphenyl)xanthene (BDMHPX) was prepared in good yield by a HCl/ZnCl2-catalyzed condensation reaction of xanthenone with 2,6-dimethylphenol. Then, several new cardo aromatic poly(ether ketone)s (PEKs) containing tetramethyl and xanthene groups in structural units were synthesized by nucleophilic substitution polycondensation reaction of BDMHPX with various difluorinated aromatic ketones in N,N-dimethylacetamide (DMAc) in the presence of anhydrous potassium carbonate. High molecular weight PEKs having numberaverage molecular weights (Mn's) in the range of 22,000-27,000 g/mol with the polydispersity index ranged from 1.8 to 2.0 were all amorphous, and showed high glass transition temperatures ranging from 231 to 277 °C, good thermal stability, and the 5 % weight loss temperatures were over 418 oC with char yields above 55 % at 650 oC in nitrogen. These new PEKs were soluble in polar aprotic solvents such as N-methyl-2-pyrrolidone and DMAc, as well as chloroform and tetrahydrofuran, and could form transparent, strong, and flexible films with tensile strengths of 57-67 MPa, Young's moduli of 2.02-2.27 GPa, and elongations at break of 7-12 %. They also showed lower dielectric constants (k = 2.68-2.80 at 1 MHz) and low water absorptions (0.46-0.60%).
- Subjects
POLYMERIZATION; POLYKETONES; TETRAMETHYL compounds; XANTHENE; CRYSTAL structure; CONDENSATION reactions
- Publication
Journal of Polymer Materials, 2017, Vol 34, Issue 2, p467
- ISSN
0973-8622
- Publication type
Article