Poly(<scp>L</scp>‐lactic acid) metal organic framework composites: optical, thermal and mechanical properties

Elangovan, Dhayalan; Yüzay, Isinay E.; Selke, Susan; Auras, Rafael

doi:10.1002/pi.3186

Cited by 34 publications

(29 citation statements)

References 25 publications

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“…The elongation at break decreased slightly for the PLA/lignin SARKANDA formulation with the increase of lignin content. However, as PLA on itself is already a brittle material [54][55][56][57][58], further decrease was difficult to detect. The measured strain at break values of neat PLA data were in agreement with the data given by the provider in the PLA 2002D datasheet and with literature results [56,59].…”

Section: Composite Materials Characteristicsmentioning

confidence: 99%

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

et al. 2013

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Due to their polyphenolic structure lignins bear a number of interesting functional properties, such as antioxidant activity. Natural antioxidants are very much looked for in the aim of protection of light or oxygen sensitive goods and are being used in active packaging. Poly(lactide) (PLA)-lignin films were prepared by twin screw extrusion followed by thermo-compression using two different commercial sources of alkali lignins obtained from gramineous plants. A good dispersion of lignin in the matrix was observed. Mechanical properties of the compounded material were merely diminished and oxygen barrier properties slightly enhanced. The chromatographic study of the lignins revealed that the low molecular weight fraction of both lignins increased during the polymer processing. The migration of low molecular weight compounds in an ethanol/water solution simulating fatty foodstuff was performed and the antioxidant activity of the extract was analysed. It was found that the activity increases with increasing severity of the heat treatment because of the generation of free phenolic monomers during processing. These results open an interesting way for application of lignins as an active compound in packaging materials. Lignins do not impair the mechanical and barrier performance of the polymer and the plastics processing even allows for the generation of active substances.

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Section: Composite Materials Characteristicsmentioning

confidence: 99%

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

et al. 2013

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“…To prove the mechanism of improved thermal performance and gain insight into the structure‐thermal property relationship, the morphologies of fractured surface of EP composites are shown in Figure . Epoxy with 1 wt% fillers (Figure A) exhibits the smooth typical brittle fracture, while a ductile fracture surface become characteristic with MOF concentrations of 5, 10, 20, 30, and 40 wt% (Figure B‐F). It is obvious that the dispersion of MOFs with the epoxy matrix appears to be uniform as 1‐10 wt% MOFs were added, and large size aggregates begin to take place when the content of MOFs reaches 30 wt%.…”

Section: Resultsmentioning

confidence: 99%

Structure‐thermal activity relationship in a novel polymer/MOF‐based neutron‐shielding material

Zhai

Song

et al. 2019

Polymer Composites

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Using epoxy resin (EP), a thermosetting polymer, as a neutron shielding material in nuclear facilities has become increasingly attractive because it is lightweight and has an excellent durability over neutron irradiation. However, it suffers from drawbacks such as reduced mechanical strength when mixed with functional fillers to improve the neutron shielding properties. In order to solve the issue, in this article, EP/gadolinium metal‐organic framework (Gd‐MOF) composites were successfully prepared, affording a new structural and functional composite with high thermal neutron shielding ability as well as good mechanical property. The shore hardness and Young's modulus of MOF/EP composites were increased remarkably compared with neat EP. Meanwhile, results indicated that the thermal performance of Gd‐MOF/EP composites was obviously increased with the addition of MOF fillers. The proposed mechanism of thermal stability improvement may provide deeper understanding of the structure‐activity relationship in thermosetting resin‐MOF composites for radiation protection application and other relevant academic research.

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“…In contrast, saturated Cu 3 BTC 2 MOF – referred to here as ‘saturated MOF’ – was obtained by conditioning at 23 °C and 50% relative humidity (RH) for four days to equilibrate and reach water storage capacity. This time period was predetermined to be sufficient for the MOF to saturate and stabilize …”

Section: Methodsmentioning

confidence: 99%

“…Dog‐bone tensile bars and XRD discs of PLLA and PLLA–5% activated MOF (PLLA‐A‐MOF) and PLLA–5% saturated MOF (PLLA‐S‐MOF) composites were prepared and stored in a desiccator over a desiccant (Drierite ® ) at room temperature ( ca 23 °C). A MOF content of 5 wt% was previously determined as enough to produce a meaningful change in the final thermal, mechanical and barrier properties of the MMMs …”

Section: Methodsmentioning

confidence: 99%

Deterioration of metal–organic framework crystal structure during fabrication of poly(l‐lactic acid) mixed‐matrix membranes

Kathuria

Abiad

Auras

2013

Polymer International

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Poly(L-lactic acid) (PLLA) and metal-organic framework (MOF) mixed-matrix membranes were prepared by melt extrusion of PLLA with 5% (w/w) of either activated or water-saturated Cu 3 (BTC) 2 (Cu 3 (C 9 H 3 O 6 ) 2 (H 2 O) 3 ·xH 2 O, HKUST-1). The morphology and the stability of injection-molded samples were evaluated using thermogravimetric analysis, differential scanning calorimetry, gel permeation chromatography, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The presence of activated and saturated MOF crystals increased the cold crystallization onset temperature as compared to neat PLLA. This can be attributed to the MOF crystals incorporated in the PLLA matrix, which decreased the mobility of PLLA and thus impeded the crystallization process. According to the XRD results, the activated MOF crystals were successfully incorporated into the PLLA matrix without altering the crystal structure of the MOF. Moreover, the findings from permeability and tensile tests as well as SEM imaging indicated good interfacial interactions between PLLA and activated MOF. However, during melt extrusion of PLLA with saturated MOF, water molecules from the saturated MOF altered the MOF crystal structure and contributed to the degradation of the PLLA polymer by reducing its molecular weight by around 21%.

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Poly(L‐lactic acid) metal organic framework composites: optical, thermal and mechanical properties

Cited by 34 publications

References 25 publications

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Structure‐thermal activity relationship in a novel polymer/MOF‐based neutron‐shielding material

Deterioration of metal–organic framework crystal structure during fabrication of poly(l‐lactic acid) mixed‐matrix membranes

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