ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
Formulas and operating conditions for the emulsion polymerization of ethylene are described. Stable latex products were obtained with a variety of anionic and nonionic emulsifiers, but for the majority of the work fatty acids or polyethoxylated alkyl phenols were used. Potassium persulfate was a satisfactory initiator at concentrations of 0.05-0.50 part per 100 parts of aqueous medium. Substitution of up to 15% of the water with tert-butyl alcohol increased the latex particle size and the molecular weight of the polymer. Pressures of 3000-5000 psig and temperatures in the range of 80-100°C. provided practical polymerization rates and stable latex products that could be concentrated by evaporation to 40-50% solids. The concentrated products were fluid and stable during storage for one year or more. Polymer isolated from the latexes exhibited a tensile strength of 1100-1400 psi, an elongation of 30-50%, and a Shore D hardness of 40-45.
Zusätzliches Material:
2 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1965.070090515
