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Chen Shaoping,Wu Zonghua,Tanaka Hiroo 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
The surfaces of sheets added with N-chloro-polyacrylamide (N-C1-PAM) are analyzed using X-ray photoelectron spectroscopy (XPS) to clarify the chemical bonding involved in the paper strength development induced by N-C1-PAM. The comparison of the observed N1s chemical shift of the sheet with those of the paper strength additives and the model compound, l-butyryl-3-propyl urea, illustrated the presence of covalent bonds of alkyl acyl urea and urethane on the fiber surfaces. Thus the formation of the covalent .bonds by N-CIthemselves and by N-C1-PAM with cellulose and hemicellulose may be an explanation for much higher effectiveness of N-C1-PAM on the improvement of wet strength of paper than A-PAM.