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Specific interactions of alkenes with different metal ion forms of ion exchangers in gas solid chromatography (1982)

Hirsch, R. F. ; Gaydosh, R. J. ; Chrétien, J. R. ; [et al.]

Springer

Chromatographia 16 (1982), S. 251-256

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ISSN: 1612-1112

Keywords: Alkenes ; Gas-solid chromatography ; Ion exchangers ; Alkene separation ; Selectivity ; Specific interactions

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Summary The gas chromatographic selectivity of K+, Zn2+, Ag+, Ni2+, and Cd2+ forms of a cation exchange packing have been determined for a set of 44 C2 to C8 alkenes. The retention characteristics of each ion are broken down into electronic (charge-transfer) and steric effects associated with the alkene sub-populations of each carbon number. Almost every pair of alkenes tested can be separated on at least one of these packings. Retention is much stronger on the ion exchangers than on metal-ion containing packings in gas-liquid chromatography, even with shorter columns and higher temperatures.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02258913

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Lithographic technique using radiation-induced grafting of acrylic acid into poly(methyl methacrylate) films (1980)

Gazard, M. ; Duchesne, C. ; Dubois, J. C. ; [et al.]

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 20 (1980), S. 1069-1072

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

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

Notes: A lithographic process is described which increases the sensitivity of polymers to electron beam irradiation. The free radicals and peroxides produced in a film of polymer by irradiation are used to initiate the grafting of a monomer to form a graft copolymer, the solubility of which may be higher or lower than that of the initial polymer. Acrylic acid has been grafted into poly(methyl methacrylate) films to produce a copolymer which is insoluble in the solvents of PMMA. The sensitivity of this negative system depends on the conditions of grafting and on the conditions of development. A sensitivity of 2.8 10-8 C.cm-2 at 20 keV has been obtained.

Additional Material: 4 Ill.