Abstract:<p class="JARTEAbstract">In this study was analyzed the effect of three different compatibilizers polyethylene-graft-maleic anhydride (PE-g-MA), unmodified halloysite nanotubes (HNTs), and HNTs treated by silanization with (3-glycidyloxypropyl) trimethoxysilane (GLYMO) (silanized HNTs) in blends of bio-based high-density polyethylene (bioPE) and poly(butylene succinate) (PBS) with a weight ratio of (70/30). Each compatibilizer was added in a proportion of (3 phr regarding PBS). Standard samples were obta… Show more
“…The absence of phase separation is good for the system since phase separation phenomena derived from polymer structure saturation can exert a negative effect on mechanical properties as reported by Rojas et al. [ 72 ] It is also worthy to note that the morphology of plasticized PLA formulations with high DBI content (i.e., 20 wt%), show presence of voids at high magnification (Figure 5). This phenomenon is usual when plasticizers are introduced, as reported by Celebi et al and Iglesias et al.…”
This work reports on the use of dibutyl itaconate (DBI) as an environmentally friendly plasticizer for polylactide (PLA) with different proportions of DBI in the 2.5–20 wt% (weight content) range. A co‐rotating twin‐screw extrusion process followed by injection molding is employed for the manufacturing of the samples. The results show that the plasticized PLA formulation with 10 wt% DBI offers the most balanced overall properties, with a noticeable increase in the elongation at break from 4.6% (neat PLA) up to 322%, with a tensile modulus of 1572 MPa, and a tensile strength of 23.8 MPa. In the case of 15 and 20 wt% DBI formulations, PLA reaches the saturation point with no more increase in the elongation at break and a clear decrease in the tensile modulus. DBI also decreases the glass transition temperature (Tg) from 61.3 °C (neat PLA) down to 23.4 °C for plasticized PLA formulation containing 20 wt% DBI, thus showing the high plasticization efficiency of DBI.
“…The absence of phase separation is good for the system since phase separation phenomena derived from polymer structure saturation can exert a negative effect on mechanical properties as reported by Rojas et al. [ 72 ] It is also worthy to note that the morphology of plasticized PLA formulations with high DBI content (i.e., 20 wt%), show presence of voids at high magnification (Figure 5). This phenomenon is usual when plasticizers are introduced, as reported by Celebi et al and Iglesias et al.…”
This work reports on the use of dibutyl itaconate (DBI) as an environmentally friendly plasticizer for polylactide (PLA) with different proportions of DBI in the 2.5–20 wt% (weight content) range. A co‐rotating twin‐screw extrusion process followed by injection molding is employed for the manufacturing of the samples. The results show that the plasticized PLA formulation with 10 wt% DBI offers the most balanced overall properties, with a noticeable increase in the elongation at break from 4.6% (neat PLA) up to 322%, with a tensile modulus of 1572 MPa, and a tensile strength of 23.8 MPa. In the case of 15 and 20 wt% DBI formulations, PLA reaches the saturation point with no more increase in the elongation at break and a clear decrease in the tensile modulus. DBI also decreases the glass transition temperature (Tg) from 61.3 °C (neat PLA) down to 23.4 °C for plasticized PLA formulation containing 20 wt% DBI, thus showing the high plasticization efficiency of DBI.
This work addresses the potential of two biobased terpenoids, linalyl acetate and geranyl acetate, as environmentally friendly monomeric plasticizers for polylactide (PLA). Plasticized formulations of PLA containing 10 wt.% and 20 wt.% terpenoids were melt-compounded in a twin-screw co-rotating extruder and, subsequently, processed by injection moulding for further characterization. In addition, a reactive extrusion process (REX) was carried out on plasticized formulations containing 20 wt.% terpenoids with dicumyl peroxide to anchor the plasticizer molecules into the PLA backbone. Both terpenoids led to a remarkable plasticization effect on PLA, with a noticeable increase in ductile properties. In particular, the elongation at break of PLA, around 4.7%, was improved to values above 230% for all the plasticized formulations, even for low terpenoid concentration of 10 wt.%. Terpenoids also provide increased crystallinity because polymers chains have more mobility and are more readily arranged. This was observed by shifting the cold crystallization process to lower temperatures. As with other monomeric plasticizers, a clear decrease in the glass transition temperature from 61.5 °C (neat PLA), to values of around 40 °C for the plasticized formulations with 20 wt.% terpenoid was obtained. The obtained formulations show high potential since the plasticization efficiency of these terpenoids is very high, thus leading to new toughened-PLA formulations with improved ductility.
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