Colloid and Polymer Science

, Volume 270, Issue 2, pp 97–105 | Cite as

Structure/property relationships in LCP/PEI blends revealed with a new selective etching process

  • W. Rose
  • L. Z. Yin
  • W. Pfandl
  • Chr Meurer
Original Contributions

Abstract

An etching technique for making visible the morphology of blends composed of polyetherimide and a liquid crystalline fully aromatic copolyester (LCP) has been developed. The four organic solvents-tetrachloroethane, N-methylpyrrolidone (NMP), dimethylformamide (DMF) and dimethylacetamide (DMAc)-selectively etch the polyetherimide without attacking the LCP component. By adjusting the etching conditions to the respective conditions prevailing within the samples, all the four solvents yielded equally good results across the entire concentration range investigated (from 20/80 to 80/20 percent by weight of LCP/PEI).

The viscosith of the LCPs decreases markedly with increasing shear rate. The large shear rate gradient from the mould edges to the centre results in different deformations of different volume elements within the melt. The resulting frozenin morphologies can be visualized with the new etching technique. This allows one to explain certain correlations between morphology and mechnical properties of the respective samples.

Key words

Liquidcrystalpolymer (LCP) polyethermide (PEI) structure etching processing behaviour rheology mechanical properties 

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References

  1. 1.
    Pfandl W, Yin L (1989) Correlation of morphology and mechanical properties of LCP/PET blends. Proc ACS Division Polymeric Materials, Science and Engineering Vol. 60, Spring Meeting, Dallas, TexasGoogle Scholar
  2. 2.
    Lin YG, Zhou R, Chien JCW, Winter HH (1988) Macromolecules 21:2014–2018Google Scholar
  3. 3.
    Tuttle JR, Bartony HE Jr, Lenz RW (1987) Polymeric Engineering and Science 27 (15):8Google Scholar
  4. 4.
    Pfandl W, Yin L (1990) Paper presented at 6th Annual Meeting of the Polymer Processing Society, NiceGoogle Scholar

Copyright information

© Steinkopff-Verlag 1992

Authors and Affiliations

  • W. Rose
    • 1
  • L. Z. Yin
    • 1
  • W. Pfandl
    • 1
  • Chr Meurer
    • 1
  1. 1.ZFE ME AC 2Forschungslaboratorium der Siemens AGErlangenGermany

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