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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2919-2926 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die mit dem Redoxpaar Kaliumpersulfat/2-Mercaptoäthanol ausgelöste Polymerisation von Acrylamid wurde in wäßriger Lösung unter Stickstoff bei 30°C untersucht. Die anfängliche Polymerisationsgeschwindigkeit war proportional zur ca. 1,5ten Potenz der Kaliumpersulfatkonzentration im Bereich von 0,6 bis 2,0 mmol l-1 und der ersten Potenz der Acrylamidkonzentration im Bereich von 0,1 bis 0,14 mol l-1. Die Geschwindigkeit war auch proportional der ersten Potenz der 2-Mercaptoäthanolkonzentration im Bereich von 4,0 bis 8,0 mmol l-1. Die Gesamtaktivierungsenergie war 134 kJ mol-1.Weiterhin wurde der Einfluß von Salzen (NaCl, KCl, NH4Cl, Na2C2O4, K2C2O4·H2O, (NH4)2C2O4, MnSO4·4H2O und NaF) und von verschiedenen aliphatischen Alkoholen (Methanol, Äthanol und Propanol) untersucht.
    Notes: The polymerization of acrylamide in aqueous media initiated by the potassium persulfate/2-mercaptoethanol redox pair was studied at 30°C under nitrogen atmosphere. The initial rate of polymerization was found to be proportional to nearly the 1,5th power of the potassium persulfate concentration within the range of 0,6 to 2,0 mmol l-1 and to the first power of acrylamide concentration in the range of 0,1 to 0,14 mol l-1. The rate was also found to be proportional to the first power of the 2-mercaptoethanol concentration within the range 4,0 to 8,0 mmol l-1. The overall activation energy was found to be 134 kJ mol-1.Further the effect of salts (NaCl, KCl, NH4Cl, Na2C2O4, K2C2O4·H2O, (NH4)2C2O4,MnSO4·4H2O, and NaF) and aliphatic alcohols (methanol, ethanol, and propanol) was tested.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 41-46 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of aqueous polymerization of acrylamide, initiated by the potassium persulfate(K2S2O8)/2-mercaptoethylamine hydrochloride (MEAH) redox pair was studied under nitrogen atmosphere at 30 ± 0,1 °C. The initial rates of polymerization were found to be proportional to [K2S2O8]1,5 (in the range of 0,8 to 1,2 mmol-1), to [acrylamide]1 (in the range of 0,8.10-1 to 1,2.10-1 mol 1-1), and to [MEAH]1 (in the range of 1,0 to 7,0mmol 1-1), respectively. The overall energy of activation was found to be 9,8 kcal mol-1 (40kJ mol-1). Water miscible alcohols and common salts (NaF, NaCl, (CH3)4NI) appeared to depress both the polymerization rate and the maximum conversion. With MnSO4.4H2O the reverse influence was found.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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