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In the UV-Vis spectra of pure light-scattering systems,there is an exponential relationship between absorbance and wavelength(A=Kλ~(-n)).Here,the exponent n is named as flocculation-coagulation parameter.In the present paper,the effects of different additives on the stability of poly(N,N’-methylenebisacrylamide-co-4-vinylpyridine)(poly(Bis-co-4-VP)) microgel dispersion were studied in detail via this parameter.The results showed that the stability of the dispersion mainly comes from the ionization of pyridine groups,making the microgel positively charged on its surface.This was confirmed by the measurement of Zeta potential and the result of conductometric titration.The result of fluorescence analysis indicated that the hydrophobicity in the microgels is enhanced with the increase in total 4-VP unit content.
In the UV-Vis spectra of pure light-scattering systems, there is an exponential relationship between absorbance and wavelength (A = Kλ ~ (-n)). Here, the exponent n is named as flocculation- coagulation parameter.In the present paper , the effects of different additives on the stability of poly (N, N’-methylenebisacrylamide-co-4-vinylpyridine) (poly (Bis- co- 4-VP)) microgel dispersion were studied in detail via this parameter. that the stability of the dispersion mainly comes from the ionization of pyridine groups, making the microgel positively charged on its surface. This was confirmed by the measurement of Zeta potential and the result of conductometric titration.The result of fluorescence analysis indicated that the hydrophobicity in the microgels are enhanced with the increase in total 4-VP unit content.