Improvements in thermal and mechanical properties of composites based on thermoplastic starch and Kraft Lignin

Freitas, Amanda de Sousa Martinez de; Rodrigues, Jéssica S.; Maciel, Cristiane C.; Pires, Ana Paula Novais; Lemes, Ana Paula; Ferreira, Marystela; Botaro, Vagner Roberto

doi:10.1016/j.ijbiomac.2021.06.153

Cited by 21 publications

(5 citation statements)

References 51 publications

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“…A gradual switch to biobased plastics has been witnessed by the increasing use at an industrial level of alternative raw materials [10,11] such as polylactic acid (PLA) [12], polybutyl succinate (PBS) [13,14], polyhydroxyalkanoate (PHA) [15][16][17], and polyethylene furanoate (PEF) [18][19][20], together with different composite materials produced from starch [21][22][23][24], CMC [25][26][27][28][29][30], wood [31,32], lignin [33,34], and many different agro-industrial wastes [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in Plastic Packaging Recycling: A Mini-Review

et al. 2021

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Today, the scientific community is facing crucial challenges in delivering a healthier world for future generations. Among these, the quest for circular and sustainable approaches for plastic recycling is one of the most demanding for several reasons. Indeed, the massive use of plastic materials over the last century has generated large amounts of long-lasting waste, which, for much time, has not been object of adequate recovery and disposal politics. Most of this waste is generated by packaging materials. Nevertheless, in the last decade, a new trend imposed by environmental concerns brought this topic under the magnifying glass, as testified by the increasing number of related publications. Several methods have been proposed for the recycling of polymeric plastic materials based on chemical or mechanical methods. A panorama of the most promising studies related to the recycling of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS) is given within this review.

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Section: Introductionmentioning

confidence: 99%

Recent Advancements in Plastic Packaging Recycling: A Mini-Review

et al. 2021

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“…The hydrophilic nature of natural polymers in general, which can be translated into low moisture resistance and poor water vapor barrier properties, is one of the main limitations that prevents their incorporation into specific markets . The addition of WS or HWS, which are rich in hydrophobic lignin, can improve the water resistance properties of the TPS bioplastics. , In Figure a, it can be seen that the moisture content of the samples was not affected after incorporating WS, whereas it was strongly reduced with the incorporation of HWS, especially in TPS–HWS-5. This effect could be justified by the increase in the number of polar groups after acid hydrolysis, as seen from the FTIR spectra of HWS in Figure S3b.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, the WS’s acid hydrolysis was proposed as a strategy to reduce the particles’ size and increase the availability of hydroxyl groups for improved interaction with the starch chains, in order to develop TPS–WS composites as food packaging materials . This approach avoids the usage of additional reagents like compatibilizers, , with negative consequences both on food container safety and the environment .…”

Section: Introductionmentioning

confidence: 99%

Composites of Thermoplastic Starch and Lignin-Rich Agricultural Waste for the Packaging of Fatty Foods

Quilez‐Molina

Paul

Merino

et al. 2022

ACS Sustainable Chem. Eng.

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Walnut shell (WS) has been demonstrated to be a promising and sustainable reinforcement in polymer composites. However, the evaluation of the overall properties provided by this lignin-rich food residue to biopolymer composites, for their use in the food packaging market, has not been evaluated yet. In this work, composite films of thermoplastic starch (TPS) containing either WS or hydrolyzed WS (HWS) and plasticized with a polyglycerol were prepared by spray drying, followed by extrusion and compression molding. TPS composites with HWS exhibited excellent UV light-blocking properties and sustained antioxidant activity for 2 weeks, ideal for preserving fatty foods. Furthermore, the compatibility of WS with TPS has been improved after the hydrolysis of WS with acetic acid. This treatment reduced the dimensions of the WS particles and exposed their hydroxyl groups, improving their compatibility with TPS, and consequently enhancing the mechanical and water vapor barrier properties. Overall, the composites containing 5 wt % of HWS exhibited the best compromise between the mechanical properties and antioxidant activity. Moreover, these composites complied with the safety requirements of the EU legislation regarding the migration of substances from the packaging to the food, in order to be used as food contact materials.

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“…This leads to the kraft lignins being used as additives themselves to improve the hydrophobicity of other materials. For example, kraft lignin has been used for improving the hydrophobicity of thermoplastic starch (TPS), increasing their water contact angles from 65.52° with pure TPS to up to 90.25° when 8% of kraft lignin was present [ 163 ] and decreasing their water absorption from 23.81% to 18.60% when kraft lignin was present [ 164 ].…”

Section: Techniques/processes For the Valorization Of Technical Ligninsmentioning

confidence: 99%

“…The addition of lignin to other polymers not only decreases the amount of toxic and not renewable materials, but it can also improve the properties of the composites. The flame retardant properties of lignins have been used to increase the thermal stability of different composites such as polypropylene [ 236 ], poly(ethylene terephthalate) [ 226 ], poly(butylene adipate-co-terephthalate) [ 237 ], or thermoplastic starch [ 163 ].…”

Section: Applicationsmentioning

confidence: 99%

The Biomodified Lignin Platform: A Review

et al. 2023

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A reliance on fossil fuel has led to the increased emission of greenhouse gases (GHGs). The excessive consumption of raw materials today makes the search for sustainable resources more pressing than ever. Technical lignins are mainly used in low-value applications such as heat and electricity generation. Green enzyme-based modifications of technical lignin have generated a number of functional lignin-based polymers, fillers, coatings, and many other applications and materials. These bio-modified technical lignins often display similar properties in terms of their durability and elasticity as fossil-based materials while also being biodegradable. Therefore, it is possible to replace a wide range of environmentally damaging materials with lignin-based ones. By researching publications from the last 20 years focusing on the latest findings utilizing databases, a comprehensive collection on this topic was crafted. This review summarizes the recent progress made in enzymatically modifying technical lignins utilizing laccases, peroxidases, and lipases. The underlying enzymatic reaction mechanisms and processes are being elucidated and the application possibilities discussed. In addition, the environmental assessment of novel technical lignin-based products as well as the developments, opportunities, and challenges are highlighted.

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Improvements in thermal and mechanical properties of composites based on thermoplastic starch and Kraft Lignin

Cited by 21 publications

References 51 publications

Recent Advancements in Plastic Packaging Recycling: A Mini-Review

Recent Advancements in Plastic Packaging Recycling: A Mini-Review

Composites of Thermoplastic Starch and Lignin-Rich Agricultural Waste for the Packaging of Fatty Foods

The Biomodified Lignin Platform: A Review

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