Aerobic biodegradability of polyester/polylactic acid composites for automotive NVH parts

Jeoung, Sun Kyoung; Ha, Jin Uk; Ko, Youn Ki; Kim, Boram; Yoo, Seung Eul; Lee, Ki Dong; Lee, Su Nam; Lee, Pyoung‐Chan

doi:10.1007/s12541-014-0522-7

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…In the area of biodegradable polymers, polylactide (PLA) has made a large contribution since this biopolyester is both fully bio-based, obtained from starch-rich materials, and compostable in controlled industrial facilities [6,7]. PLA is a linear thermoplastic that shows high mechanical resistance and thermal stability, good transparency, and water-barrier performance, by which it can potentially substitute some polymer commodities, such as polypropylene (PP) or polystyrene (PS), in several applications, ranging from food packaging [8][9][10] to automotive [11], biomedicine [12], or electronics [13]. In spite of this, the use of PLA-based articles is currently limited by its poor toughness and brittle behavior, low thermomechanical resistance, and relatively high cost [14].…”

Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

Terroba-Delicado

Fiori²,

Torres‐Giner

et al. 2021

Preprint

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This work puts the Circular Bioeconomy’s concept into action, originally valorizing residues from the beverage liquor coffee industry into reinforcing fillers for green composites of polylactide (PLA). The as-received spent coffee grains derived from liquor waste were first milled to obtain the so-called spent coffee grounds (SCGs), which were then incorporated at 20 wt.% into PLA by extrusion. With the aim of improving the compatibility between the biopolyester and the lignocellulosic particles, two oligomers of lactic acid (OLAs), namely OLA2 and OLA2mal, being the latter functionalized with maleic anhydride (MAH), were both added during the extrusion process at 10 wt.%. The resultant compounded pellets were finally shaped into pieces by injection molding for characterization. Results showed that, as opposite to most claims published in the literature of PLA composites based on lignocellulosic fillers derived from soluble coffee wastes, the incorporation of liquor waste derived SCGs increased the ductility of the pieces by nearly 280% due to their high coffee oil content. The incorporation of OLA2 and OLA2mal contributed to improve the impact strength of the pieces by approximately 6% and 12.6%, respectively. The higher performance of OLA2mal was ascribed to a reduction of crystallinity in the green composite due to the chemical interaction by the MAH groups. However, the incorporation of SCGs into PLA slighlty reduced the thermal stability and yielded a dark-to-brown color, whereas it also delayed the disintegration rate of the pieces in controlled compost soil. Therefore, the results attained herein open up novel opportunities for the development of green composites of PLA with higher ductility and toughness through the valorization of liquor coffee wastes.

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Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

Terroba-Delicado

Fiori²,

Torres‐Giner

et al. 2021

Preprint

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“…Polylactide (PLA) is a linear thermoplastic biodegradable polyester that can be obtained from starch-rich materials by fermentation to give lactide, which is polymerized at the industrial scale by ring-opening polymerization (ROP) [1]. PLA is a sound candidate to substitute some plastic commodities such as polypropylene (PP) or polystyrene (PS) in packaging applications [2][3][4][5][6], electronics [7], automotive [8], agriculture [9], textile, consumer goods, 3D printing applications [10][11][12][13], biomedical devices [14,15], pharmaceutical carriers [16,17], etc. The main advantage of PLA over As PLA is very sensitive to moisture, the biopolyester pellets were dried at 60 • C for 24 h. The OLA content varied in the 0-20 wt% at weight steps of 5 wt%.…”

Section: Introductionmentioning

confidence: 99%

Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior

et al. 2019

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This work reports the effect of the addition of an oligomer of lactic acid (OLA), in the 5-20 wt% range, on the processing and properties of polylactide (PLA) pieces prepared by injection molding. The obtained results suggested that the here-tested OLA mainly performs as an impact modifier for PLA, showing a percentage increase in the impact strength of approximately 171% for the injection-molded pieces containing 15 wt% OLA. A slight plasticization was observed by the decrease of the glass transition temperature (T g ) of PLA of up to 12.5 • C. The OLA addition also promoted a reduction of the cold crystallization temperature (T cc ) of more than 10 • C due to an increased motion of the biopolymer chains and the potential nucleating effect of the short oligomer chains. Moreover, the shape memory behavior of the PLA samples was characterized by flexural tests with different deformation angles, that is, 15 • , 30 • , 60 • , and 90 • . The obtained results confirmed the extraordinary effect of OLA on the shape memory recovery (R r ) of PLA, which increased linearly as the OLA loading increased. In particular, the OLA-containing PLA samples were able to successfully recover over 95% of their original shape for low deformation angles, while they still reached nearly 70% of recovery for the highest angles. Therefore, the present OLA can be successfully used as a novel additive to improve the toughness and shape memory behavior of compostable packaging articles based on PLA in the new frame of the Circular Economy.

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“…Despite its many advantages, PLA is a relatively expensive material, which has an impact on its applicability. PLA is a material that can successfully replace other commonly used plastics such as polypropylene (PP) or polystyrene (PS) in packaging applications [1][2][3][4][5][6][7][8], automotive [9,10], consumer goods, electronics [11,12], 3D printing applications [13][14][15][16][17], and biomedical devices [18,19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Selected Properties of Microporous PLA as a Result of Abiotic Degradation

2022

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In the study, an investigation was made into the hydrolytic degradation behavior of the microporous polylactide (PLA) in the initial stage in three biological buffer solutions with various pH-simulating body fluids in comparison with pure PLA. Studies also include the analysis of selected mechanical properties and physical structures. A microporous PLA was obtained by melt extrusion using a chemical blowing agent. The rate of Mw decrease induced by hydrolysis over 35 days of microporous PLA was roughly comparable to the pure material. The rate of depolymerization was slightly accelerated at an acid pH due to acid-catalyzed hydrolysis at the end of the observed period. The mechanical analysis showed the influence of various pH on the obtained results.

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Aerobic biodegradability of polyester/polylactic acid composites for automotive NVH parts

Cited by 7 publications

References 10 publications

Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior

Analysis of Selected Properties of Microporous PLA as a Result of Abiotic Degradation

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