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Melamine-Formaldehyde Resin Prepolymers (Mixed Solvent Eluent) (GF-310)

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Melamine-formaldehyde resin were analyzed using Asahipak GS-310 7G. In some cases, a mixture of two solvents, with different hydrophobicities, is used as an eluent. When the structure or the characteristics of the sample are complicated, it is useful to use such mixed-solvent eluent. Melamine-formaldehyde resin is analyzed by using a chloroform/methanol eluent. The sample interacts with the packing material, when an eluent such as just chloroform or methanol is used. Therefore, this sample cannot be eluted by GPC mode. When a chloroform/methanol(80/20) eluent is used, however, the interaction disappears and the elution by GPC mode can take place.
GS-310 7G is an old type of GF-310 HQ.



Sample : Melamine-formaldehyde resin
Column    : Shodex Asahipak GS-310 7G (7.5mmI.D. x 500mm)
Eluent    : CHCl3/CH3OH
Flow rate : 0.5mL/min
Detector  : UV(254nm)
S. Mori, J. Liq. Chromatogr. 11 (6) (1988) 1205