INVESTIGADORES
FAILLA Marcelo Daniel
capítulos de libros
Título:
Melt grafting of N-Carbamyl Maleamic Acid onto Polypropylene in the Transient Sate
Autor/es:
RODRIGO SERRA; MARCELO D. FAILLA; ENRIQUE M. VALLÉS; SEBASTIÃO V. CANEVAROLO
Libro:
Engineering with Polymers. A Europe-Latin America research experience
Editorial:
Plastinet Ed.
Referencias:
Año: 2007; p. 103 - 110
Resumen:
  The grafting process of N-carbamyl maleamic acid (NCMA) onto polypropylene (PP) was performed in the molten state using a Werner & Pleiderer ZSK 30 twin extruder and a Haake mixer. The experiments with the extruder were performed using a screw rotation of 70 rpm, and barrel-set temperatures at 180, 210 and 240°C. The process was carried out in transient state. After a steady state flow of PP was reached in the extruder, a pulse of 3 g of a physical mixture of PP, NCMA and 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane (DBPH) was quickly added into to the  PP stream. The concentrations of NCMA employed in this work were 0.66, 0.88 and 1.11wt% (based in the mass of PP), while the concentration of DBPH were 1, 0.5 and 0.25wt%.    The residence time distribution (RTD) was determined by means of an in-line optical detector placed at the exit of the extruder.  Samples of the modified polymer were collected at the exit at various time intervals. The samples collected at the time corresponding to the maximum of the RTD curve were characterized using Fourier transform infrared spectroscopy to verify the grafting of NCMA. In addition, the modification of PP was carried out using a batch mixer working at 70 rpm and at temperatures of 180, 210 and 240°C with the aim of comparing the grafting efficiency achieved with the extruder.