Preparation and influencing factors of density gradient columns for polyethylene density determination
Density gradient columns were prepared using the relevant methods in Appendix A of GB/T 1033.2-2010.The calculation and influencing factors involved in the preparation process were studied.It was found that the selection of density and volume of light and heavy liquids,the ratio of mixed liquids determined the distribution of standard floats,and factors such as the selection of mixed liquid system,injection speed,and stirring speed affected the density of floats(ρ)-The linearity of the float height(H)curve.provides optimization suggestions for these factors,which can improve the success rate of density gradient column configuration.
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