Papers Published

1. Evtiouguina, Margarita and Barros, Ana Margarida and Cruz-Pinto, Jose J. and Neto, Carlos Pascoal and Belgacem, Naceur and Pavier, Claire and Gandini, Alessandro, Oxypropylation of cork residues: Preliminary results, Bioresource Technology, vol. 73 no. 2 (2000), pp. 187 - 189 [S0960-8524(99)00158-3] .
   (last updated on 2007/04/08)

   Abstract:
   Cork was chemically modified with the purpose of reaching a better understanding of its reactivity in heterogenous systems, and obtaining novel products with potential applications in the realm of polymeric materials. Several cork particles were oxypropylated under pressure at a relatively high temperature and yielded a mixture of liquid polyols composed of propylene oxide homopolymer (PPO) and cork macromolecules bearing oligo(propylene oxide) grafts. The solid residue was characterized by Fourier transform infrared (FTIR) spectroscopy only, whereas the two viscous polyols were submitted to FTIR, H- and C- NMR spectroscopy, differential scanning calorimetry, gel permeation chromatography, vapor pressure osmometry, bulk viscometry and OH number.

   Keywords:
   Chemical modification;Propylene;Pressure effects;High temperature applications;Polypropylene oxides;Macromolecules;Oligomers;Graft copolymers;Fourier transform infrared spectroscopy;Nuclear magnetic resonance spectroscopy;Differential scanning calorimetry;Viscosity measurement;