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Preparation of Composites by 〈i〉In Situ〈/i〉 Polimerisation of PET-Hydrotalcite Using Dodecylsulphate (2008)

Martínez-Gallegos, S. ; Herrero, Maria ; Rives, Vicente

s.l. ; Stafa-Zurich, Switzerland

Materials science forum Vol. 587-588 (June 2008), p. 568-571

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ISSN: 1662-9752

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: A polyethylenterephthalate-hydrotalcite (PET-HT) composite was prepared by in situpolymerisation, using polyethylenterephthalate (PET) and different amounts of a hydrotalcite withdodecylsulphate in the interlayer space (DS-HT). The resulting material has been characterised bypowder X-ray diffraction (PXRD) and thermogravimetric (TG) analysis. The thermal stability ofPET is not greatly enhanced upon incorporation of the inorganic component, despite PXRD showsthat the HT is exfoliated in the composite. Thus with 2-10% shows a complete dispersion of thelayered component in the polymeric matrix, while if the inorganic loading is between 20-50 %(larger loadings were not tested) no complete dispersion is achieved and PXRD-detectableagglomerates are formed

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.568.pdf

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Determination of 2,4-D in aqueous solution by neutron activation analysis (1999)

Martínez-Miranda, V. ; Martínez-Gallegos, S. ; Esteller, M. V. ; [et al.]

Springer

Journal of radioanalytical and nuclear chemistry 241 (1999), S. 323-325

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ISSN: 1588-2780

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract A method based on neutron activation analysis was developed for the determination of fractions of milligrams of 2,4-D (2,4-dichlorophenoxy acetic acid) in aqueous solution in laboratory tests. The indirect determination of 2,4-D was based on the quantification of chlorine,38Cl, produced by neutron activation. The range of application was 0.01–100 mg l−1. No loss of38Cl by chemical effects of the nuclear reaction was found. The advantages of the proposed method include high precision and sensitivity of determination. Results were compared with those obtained by UV-Vis spectrophotometry, where concentrations less than 1 mg·l−1 were not detected.