Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: Darie R.N., Bercea M., Kozlowski M., Spiridon I
Editorial: Cellulose Chemistry and Technology, 45 (1), p.127-135, 2011.
Due to their common use in outdoor applications, the durability of wood flour thermoplastic composites
after ultraviolet exposure has become a special concern. Samples of 100% low-density polyethylene (LDPE)
and LDPE filled with 10, 20, 30 wt% oak wood flour were melt-processed with a Brabender mixer and
further weathered in an accelerated weathering chamber up to 500 h. The changes occurring in composites
aged under controlled conditions were evaluated in comparison with the initial composites by measuring
their mechanical properties and as well as by FT-IR spectroscopy. Melt processing was studied, while
mechanical evaluation has been performed to follow composites behaviour on tensile and impact tests. The obtained results showed that, after accelerated weathering, the composites retain a higher fraction of the original mechanical properties. Fourier transform infrared spectroscopy (FT-IR) was used to monitor the changes of carbonyl and vinyl groups and dynamic rheology was used to evaluate the viscoelastic behaviour of the studied composites.
Cuvinte cheie: oak wood composites, artificial ageing, FT-IR, mechanical properties, dynamic rheology