Preparation and determination of hydroximic polyacrylamide

Abstract

A new kind of polyacrylamide derivate, hydroximic polyacrylamide (HPAM), was prepared from polyacrylamide (PAM) with hydroxylamine hydrochloride in KOH/alcohol solution. Based on colorimetric method in the measurement of C_7–9 alkyl hydroximic acid, the substitution degree of HPAM was determined by selecting octyl hydroximic acid as a primary standard substance. The effects of temperature, the amount of hydroxylamine and potassium hydroxide, and the reaction time on the reaction are discussed. HPAM with 5.78% substitution of degree was acquired by optimizing the reaction conditions. IR spectra revealed that tautomerism appears in the HPAM, and that HPAM exists in both the forms of hydroxamic type and hydroximic type, and the latter type can easily lead to the forming of intramolecular hydrogen bond.

Keywords

polyacrylamide / hydroximic acid / hydroxamic acid / substitution degree

References

[1] Walter M M. Acrylamide polymers in encyclopedia of polymer science and engineering [M]. 2nd. John Wiley & Sons Inc, 1987.

[2] ZhangJ, HuguenardC, ScarnecchiaC, et al.. Stabilization and destabilization of hematite suspensions by neutral and anionic polyacrylamide [J]. Colloids Surf, A, 1999, 151(1–2): 49-63

[3] TripathyT, SinghR P. High performance flocculating agent based on partially hydrolyzed sodium alginate-g-polyacrylamide [J]. Eur Polym J, 2000, 36(7): 1471-1476

[4] EmileP. Polyacrylamide at solid/liquid interfaces [J]. Journal of Colloid and Interface Science, 1999, 216: 197-220

[5] XuD D, AplanF F. Joint of metal ion hydroxy complexes and organic polymers to depress pyrite and ash during coal flotation [J]. Miner Metall Process, 1994, 11: 223-230

[6] NagarajD R. Development of new flotation chemicals [J]. Trans Indian Inst Met, 1997, 50: 355-363

[7] BoultonA, FornasieroD, RalstonJ. Selective depression of pyrite with polyacrylamide polymers [J]. Int J Miner Process, 2001, 61(1): 13-22

[8] WalterW L, HenryE BOrganic chemistry [M], 19835th edUSA, D C Heath and Company

[9] LinJiang-shun, GaoYing-jian, ZhangLai-wen. Flotation of hematite with C5–9 alkyl hydroxamic acid [J]. Nonferous Metals, 1999, 51(3): 45-48(in Chinese)

[10] BeijingMining, MetallurgyInstituteAnalysis of organic flotation reagents (in Chinese) [M], 1987, Beijing, Metallurgy Industry Press