Effect of the Joncryl® ADR Compatibilizing Agent in Blends of Poly(butylene adipate‐co‐terephthalate)/Poly(lactic acid)

Abstract

The growing search for biodegradable products contributes to the development of new materials. In this work, the effect of the Joncryl® ADR chain extender on poly(butylene adipate‐co‐terephthalate)/poly(lactic acid) blends was investigated. The mechanical, thermal, and morphological properties and the contact angle of the blends were also studied. The addition of the chain extender can either improve the adhesion between the phases or act as a stress concentrator, depending on the proportion of PLA present in the blend. However, in all samples, the elongation at break was increased. This behavior is also observed in the morphology of the blends, changing the shape of the PLA particles, from spherical to ellipsoid phase. However, in the proportion used (0.5 wt%), the chain extender was not enough to increase the adhesion between the phases of the blends, just the dispersion of the PLA particles. Besides, it is possible to observe that the higher the PLA content in the PBAT mixture, the lower wettability surface of the blends is reached.

Poly(lactic acid) (PLA)/Poly(butylene succinate-co-adipate) (PBSA) Compatibilized Binary Biobased Blends: Melt Fluidity, Morphological, Thermo-Mechanical and Micromechanical Analysis

“…EO determined a decrease in the crystallinity in pure PLA and in blends with PBAT because of the introduced disorder due to the branching of chains. Lascano et al [ 55 ] did not determine the crystallinity of their PLA/PBSA but the thermograms they reported were in good agreement with Nunes et al [ 84 ] observations. These considerations can explain the observed necessity to increase the molding temperature in the injection molding of blends containing EO, to counterbalance the reduced tendency to crystallization with a decreased undercooling favoring the extension of the crystalline fraction.…”

“…In fact, the crystallization occurring in the mold had a significant role in allowing a rapid and efficient ejection of the specimen by the machine without any distortion. Moreover, thermal properties related to the use of EO were yet investigated by Nunes et al [ 84 ] in PLA. EO determined a decrease in the crystallinity in pure PLA and in blends with PBAT because of the introduced disorder due to the branching of chains.…”

The Use of Agricultural Waste in the Modification of Poly(lactic acid)-Based Composites Intended for 3D Printing Applications. The Use of Toughened Blend Systems to Improve Mechanical Properties

“…Since the crystallinity of the pure PLA sample was relatively low (≈7%), the results at the level of around 23-30% for the modified samples clearly show the nucleating effect of the PBAT and TPS inclusions. Interestingly, the addition of CE decreases the crystallinity slightly below 20%, which might be related to the chemical bonding of parts of the PLA chains on the blends interface surface [70].…”

Effect of PVOH/PLA + Wax Coatings on Physical and Functional Properties of Biodegradable Food Packaging Films

“…According to the Owens–Wendt approach, the neat Biofilm substrate showed highly hydrophobic behavior, with a low polar fraction of surface energy and the lowest polarity value , equal to 0.07. Hydrophobicity can be enhanced by some additives, such as cardanol oil [ 71 ] and pine resin derivatives [ 72 ], by chain extenders, such as Joncryl ADR 4370S [ 73 ], or by particular arrangements and conformations of polymer chains [ 74 ]. On the other hand, the m-PVOH coating had higher surface energy, with an increased polar fraction and the highest polarity value (equal to 0.43), as a consequence of the number of polar units (–OH and C=O groups) in its structure.…”