Investigation of semicrystalline morphology in poly(ether ether ketone)/poly(ether imide) blends by dielectric relaxation spectroscopy

✍ Scribed by Joseph F. Bristow; Douglass S. Kalika

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 896 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00517-4

✦ Synopsis

The semicrystalline morphology of a series of poly(ether ether ketone) [PEEK]/poly(ether imide) [PEI] blends has been investigated as a function of blend composition and crystallization condition by dielectric relaxation spectroscopy. Dielectric scans of the crystallized blends revealed two glass-rubber relaxations for all specimens corresponding to the coexistence of a mixed amorphous interlamellar phase, and a pure PEI phase residing in interfibrillar/interspherulitic regions; no (pure PEEK) crystal amorphous interphase was observed. Variations in the composition of the mixed interlamellar phase with crystallization temperature were consistent with kinetic control of the evolving morphology: lower crystallization temperatures led to an increase in the amount of PEI trapped between crystal lamellae. Comparison of the relaxation characteristics of the interfibrillar/interspherulitic phase with those of pure PEI indicated a much broader spectrum of local relaxation environments for PEI in the blends, consistent with PEI segregation across a wide range of size scales.