Selective etching of thermotropic liquid crystalline polyesters

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Hedmark, Per G.Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (author)

Selective etching of thermotropic liquid crystalline polyesters

Article/chapterEnglish1987

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Wiley,1987
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LIBRIS-ID:oai:DiVA.org:ltu-6761
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-6761URI
https://doi.org/10.1002/app.1987.070340226DOI

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Language:English
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Godkänd; 1987; 20070528 (cira)
DSC, IR, ESCA, macroscopic etching rate measurements, analysis of etchant solution, and electron microscopy conclusively show that n-alkylamines (ethylamine, n-propylamine, n-butylamine, and n-pentylamine) and NaOH selectively degrade (etch) the ethylene terephthalate (ET)-rich phase in glassy liquid crystalline poly(p-hydroxybenzoic acid-co-ethylene terephthalate) [P(HBA-ET)] with molar compositions 0.60:0.40 and 0.80:0.20. ESCA demonstrates the excellent selectivity of the n-alkylamine etchants in the 0.60:0.40 copolymer. The 50 Å top layer of the etched samples contains 95 mol% HBA. Treatment with H2SO4 and NH3 gives ambiguous results, and these compounds are not suitable as etchants. It is demonstrated by electron microscopy on the 0.60:0.40 copolymer, in accordance with earlier reports by Joseph et al.,5-8 that the ET-rich phase is discontinuous (1-2 m spheres) and surrounded by an HBA-rich matrix. SEM is a useful tool for characterization of this morphology. However, both phases have a substracture which is revealed only by TEM. The morphology of the 0.80:0.20 copolymer is fine-textured, which means that SEM is a less suitable method for the characterization of etched samples.
DSC, IR, ESCA, macroscopic etching rate measurements, analysis of etchant solution, and electron microscopy conclusively show that n-alkylamines (ethylamine, n-propylamine, n-butylamine, and n-pentylamine) and NaOH selectively degrade (etch) the ethylene terephthalate (ET)-rich phase in glassy liquid crystalline poly(p-hydroxybenzoic acid-co-ethylene terephthalate) [P(HBA-ET)] with molar compositions 0.60:0.40 and 0.80:0.20. ESCA demonstrates the excellent selectivity of the n-alkylamine etchants in the 0.60:0.40 copolymer. The 50 Å top layer of the etched samples contains 95 mol% HBA. Treatment with H2SO4 and NH3 gives ambiguous results, and these compounds are not suitable as etchants. It is demonstrated by electron microscopy on the 0.60:0.40 copolymer, in accordance with earlier reports by Joseph et al.,5-8 that the ET-rich phase is discontinuous (1-2 m spheres) and surrounded by an HBA-rich matrix. SEM is a useful tool for characterization of this morphology. However, both phases have a substracture which is revealed only by TEM. The morphology of the 0.80:0.20 copolymer is fine-textured, which means that SEM is a less suitable method for the characterization of etched samples.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Industriell bioteknik Biomaterial hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bio Materials hsv//eng
Träfysik
Wood Physics

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Jansson, Jan-FredrikDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (author)
Hult, AndersDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (author)
Lindberg, HenrikDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (author)
Gedde, Ulf W.Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (author)
Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (creator_code:org_t)

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In:Journal of Applied Polymer Science: Wiley34:2, s. 743-7620021-89951097-4628

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