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Improvement of the processability of poly(ether ketone ketone) by the addition of a thermotropic liquid crystalline polymer
Author(s) -
Son Younggon,
Chun Yong Sung,
Weiss R. A.
Publication year - 2004
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20048
Subject(s) - thermotropic crystal , copolyester , materials science , glass transition , crystallization , polymer , ether , ultimate tensile strength , ketone , polymer chemistry , composite material , liquid crystalline , chemical engineering , organic chemistry , chemistry , polyester , engineering
Abstract The addition of a thermotropic liquid crystalline, wholly aromatic copolyester, TLCP, improved the melt processability of poly(ether ketone ketone), PEKK. The tensile strength and modulus of the blends also improved with increasing TLCP, but the elongation at break decreased significantly. The blends were phase‐separated, but the polymers were partially miscible as evident from shifts of the glass transition temperature ( T g ) of each component towards that of the other component in the blend. Similarly, the melting points ( T m ) of both components were depressed by blending. When the crystallization temperature was above T m of the TLCP, the PEKK crystallization rate in the blend was slower than for the pure material, while crystallization was faster when the temperature was below T m of the TLCP. Polym. Eng. Sci. 44:541–547, 2004. © 2004 Society of Plastics Engineers.