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Wood particle/high-density polyethylene composites: Thermal sensitivity and nucleating ability of wood particles

The thermal sensitivity, nucleating ability, and nonisothermal crystallization of high-density polyethyl- ene (HDPE) with different wood fillers during wood/HDPE melt processing were investigated with thermogravimetric analysis and differential scanning calorimetry. The results showed that the wood degraded at a lower temperature than HDPE. The thermal decomposition behavior was similar across wood species. The most remarkable dissimilarities were observed between wood and bark in the decomposition rate around a processing temperature of 300 � Ca nd in the peak temperature location for cellulose degradation. The higher degradation rate for bark was explained by the devo- latilization of extractives and the degradation of lignin, which were present in higher amounts in pine bark. The nucleating ability for various wood fillers was evaluated with the crys- talline weight fraction, crystal conversion, crystallization half- time, and crystallization temperature of the HDPE matrix. The nucleation activity improved with the addition of wood particles to the HDPE matrix. However, no effect of wood species on the crystal conversion was found. For composites based on semicrystalline matrix polymers, the crystal conver- sion may be an important factor in determining the stiffness