Comprehensive exploration of natural degradation of poly(lactic acid) blends in various degradation media: A review

Rosli, Noor Afizah; Karamanlioglu, Mehlika; Kargarzadeh, Hanieh; Ahmad, Ishak

doi:10.1016/j.ijbiomac.2021.07.196

Cited by 100 publications

(44 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Enzymatic degradation is the main approach of biodegradation. According to the previous reports, proteinase K, a well-known enzyme, can catalyze the hydrolysis of PLLA when PLLA contains sufficiently long polymer segments in the amorphous phase. , In the natural environment, proteinase K and its analogs produced by environmental microorganisms will catalyze the hydrolysis of PLLA. Therefore, proteinase K was adopted to show the enzymatic degradation of PLLA samples doped with QDs in this study.…”

Section: Resultsmentioning

confidence: 99%

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs

Zhang

Jin

et al. 2022

J. Phys. Chem. C

View full text Add to dashboard Cite

Plastic pollution has become a vital issue that damages the ecosystem and threatens human health. Nevertheless, tracking how the microplastics, i.e., the main product of plastics, degraded in the environment remains difficult. To address this challenge, we herein report a simple but innovative model system formed by poly(L-lactic acid) (PLLA) and CuInS 2 @ZnS quantum dots (QDs) for optically tracking the degraded microplastics. The PLLA films incorporated with QDs were prepared through blending PLLA with hydrophobic CuInS 2 @ZnS QDs followed by hot pression. The optical stability of PLLA films was evaluated, and both the enzymatic degradation and fermentation behaviors of bulk PLLA were investigated. The uptake of microplastics by different microorganisms was analyzed through fluorescence imaging, and the results revealed that the PLLA microplastics were mainly collected by Gram-positive cocci. Preliminary animal studies on zebrafish suggested that the microplastics doped with QDs remained fluorescent in vivo, even though the microplastics were very toxic.

show abstract

Section: Resultsmentioning

confidence: 99%

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs

Zhang

Jin

et al. 2022

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…The dispersion of hydrophilic fillers by melt-blending substantially improves water uptake and thus enhances PLA degradation via hydrolysis, as the PLA blends are rendered porous due to their blend morphology, swelling, and dissolution of hydrophilic dispersed phases that serve as nutrients for microorganisms. [435,[437][438][439] In an alternative strategy, the incorporation of acetal groups into the PLA backbone was achieved by ring-opening copolymerization of L-lactide with 1,3-dioxolan-4one and rendered the resulting polyesteracetals rapidly and fully biodegradable in both distilled water and seawater. [440] On the one hand, enhanced hydrolysis of PLA is highly beneficial to PLA degradation in soil and water.…”

Section: Biodegradable Plasticsmentioning

confidence: 99%

Closing the Carbon Loop in the Circular Plastics Economy

Schirmeister

Mülhaupt

2022

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Today, plastics are ubiquitous in everyday life, problem solvers of modern technologies, and crucial for sustainable development. Yet the surge in global demand for plastics of the growing world population has triggered a tidal wave of plastic debris in the environment. Moving from a linear to a zero‐waste and carbon‐neutral circular plastic economy is vital for the future of the planet. Taming the plastic waste flood requires closing the carbon loop through plastic reuse, mechanical and molecular recycling, carbon capture, and use of the greenhouse gas carbon dioxide. In the quest for eco‐friendly products, plastics do not need to be reinvented but tuned for reuse and recycling. Their full potential must be exploited regarding energy, resource, and eco‐efficiency, waste prevention, circular economy, climate change mitigation, and lowering environmental pollution. Biodegradation holds promise for composting and bio‐feedstock recovery, but it is neither the Holy Grail of circular plastics economy nor a panacea for plastic littering. As an alternative to mechanical downcycling, molecular recycling enables both closed‐loop recovery of virgin plastics and open‐loop valorization, producing hydrogen, fuels, refinery feeds, lubricants, chemicals, and carbonaceous materials. Closing the carbon loop does not create a Perpetuum Mobile and requires renewable energy to achieve sustainability.

show abstract

“…The first step of PLA degradation is related to hydrolysis due to the presence of ester groups on the PLA backbone, which facilitates it. However, the degradation rate of PLA will be increased by placing the polymer under a composting medium rather than in soil or seawater (Rosli et al 2021).…”

Section: Esd Occurs Whenmentioning

confidence: 99%

Photo-Oxidative Degradation and Hydrolytic Degradation of Micro-Graphite Filled Poly(lactic acid) Composites

Kaavessina

Shohih

Distantina

et al. 2022

ASEAN J. Chem. Eng.

View full text Add to dashboard Cite

In a specific range of electrical conductivity, poly(lactic acid)/PLA has the potential to be developed into environmentally friendly antistatic packaging after a modification process. PLA was blended in a mini single screw extruder at 180oC with different compositions of micro-graphite (0, 0.5, 1, and 1.5 %wt.). This report discusses the degradability of PLA composite, i.e., photo-oxidative degradation and hydrolytic degradation. The weight loss, thermal properties, and cross-section morphology of the tested specimens were monitored periodically. During the degradation test, micro-graphite could be released from the composite, leaving a rough surface and reducing the weight of the composite. Differential scanning calorimetry (DSC) test exhibited that the presence of micro-graphite did not influence the melting temperature of the composition studied. However, the onset temperature of the melting point showed a slight shift of about 2-4oC. Bulk crystallinity demonstrated a considerable dependence on the micro-graphite loading (0-1.5%wt). However, there were two contradictory phenomena after both degradation tests. UV exposure could stimulate the fragmentation of PLA chains, break the crystal structure and increase the embrittlement. Thus, crystallinity tended to decrease during photo-oxidative degradation. In hydrolytic degradation, degradation firstly occurred in the amorphous regions and was ongoing within the studied range of time (0-20 weeks). Thus, the bulk crystallinity of composite tended to increase.

show abstract

Comprehensive exploration of natural degradation of poly(lactic acid) blends in various degradation media: A review

Cited by 100 publications

References 88 publications

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs

Closing the Carbon Loop in the Circular Plastics Economy

Photo-Oxidative Degradation and Hydrolytic Degradation of Micro-Graphite Filled Poly(lactic acid) Composites

Contact Info

Product

Resources

About

Comprehensive exploration of natural degradation of poly(lactic acid) blends in various degradation media: A review

Cited by 100 publications

References 88 publications

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS2@ZnS QDs

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS2@ZnS QDs

Closing the Carbon Loop in the Circular Plastics Economy

Photo-Oxidative Degradation and Hydrolytic Degradation of Micro-Graphite Filled Poly(lactic acid) Composites

Contact Info

Product

Resources

About

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs

Tracking How Biodegraded Microplastics Enter the Ecosystem with CuInS₂@ZnS QDs