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Abstract
AbstractIn this work, different contents (0.25, 0.50, 0.75, and 1 phr) of dicumyl peroxide (DCP) are incorporated into the bio‐based high‐density polyethylene (bioPE)/kraft lignin (KL) blends with a composition of 80 and 20 wt%, respectively with the aim of improving overall performance. The samples are obtained by reactive extrusion and injection‐molding process, and then their overall performance is assessed by tensile tests, thermal analysis, optical and surface appearance, and wettability studies. The obtained mechanical properties confirm the successful interaction between bioPE and KL due to the addition of organic peroxide, which plays a key role in compatibilization. In particular, bioPE/KL blends with 1 phr of DCP achieve an increase in elongation at break of about 300% together with a noticeable increase in the impact strength of about 29% higher than the uncompatibilized bioPE/KL blend, while the tensile modulus decreases 42%. In addition, images obtained by field emission scanning electron microscopy show that the presence of DCP in the blends enhances better dispersion of KL into the bioPE matrix. The wettability analysis indicates that KL and DCP affect the hydrophobicity of the neat bioPE. Therefore, the resultant blends can be considered as potential sustainable polymers with balanced properties.
Highlights
Introduction are some areas in whichkraft lignin (KL) has shown some promising results such as biochemicals after chemical pyrolysis or degradation,[7]Lignin is an aromatic copolymer considered the second most as a heavy metal adsorbent,[9] as hydrogels,[10,11] and as filler,[12] abundant component of wood after cellulose.[1]
BioPE/KL compatibilized by reactive extrusion (REX) with dicumyl peroxide (DCP), offers a dark brown color, it is possible to compare it with Eucalyptus gummifera, which is a species within the Eucalyptus family, that presents values of 37.36, 22.50, 23.35, for L*, a*, and b*, respectively.[44]
BioPE/KL blends offered a similar lightness value to that of Eucalyptus gummifera, while values obtained for a* and b* show some slight variation, which indicates that the blends obtained in this study present low red and yellow appearance
Summary
Introduction are some areas in whichKL has shown some promising results such as biochemicals after chemical pyrolysis or degradation,[7]Lignin is an aromatic copolymer considered the second most as a heavy metal adsorbent,[9] as hydrogels,[10,11] and as filler,[12] abundant component of wood after cellulose.[1]. KL has shown some promising results such as biochemicals after chemical pyrolysis or degradation,[7]. Lignin is an aromatic copolymer considered the second most as a heavy metal adsorbent,[9] as hydrogels,[10,11] and as filler,[12] abundant component of wood after cellulose.[1] It is constituted among others. The use of lignin as a polymer reinforcement has proven to be a good alternative due to its positive effects on the ther-. Lascano its relative homogeneous distribution when blended with other. Escuela Politécnica Nacional Quito 170517 Ecuador materials.[16] Lignin has been considered a good filler to be used in polymeric matrices.[17] In some cases, lignin has been used
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