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- Hedmark, Per G.Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (författare)
Selective etching of thermotropic liquid crystalline polyesters
- Artikel/kapitelEngelska1987
Förlag, utgivningsår, omfång ...
- Wiley,1987
- printrdacarrier
Nummerbeteckningar
- 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
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska &engelska
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Klassifikation
Anmärkningar
- 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.
Ämnesord och genrebeteckningar
- TEKNIK OCH TEKNOLOGIER Industriell bioteknik Biomaterial hsv//swe
- ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bio Materials hsv//eng
- Träfysik
- Wood Physics
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Jansson, Jan-FredrikDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (författare)
- Hult, AndersDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (författare)
- Lindberg, HenrikDepartment of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (författare)
- Gedde, Ulf W.Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (författare)
- Department of Polymer Technology, The Royal Institute of Technology, Stockholm, Sweden (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Journal of Applied Polymer Science: Wiley34:2, s. 743-7620021-89951097-4628
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