Non-isothermal crystallization kinetics, thermal degradation behavior and mechanical properties of poly(lactic acid)/MOF composites prepared by melt-blending methods

Dai, Xiu; Cao, Yu; Shi, Xiaowei; Wang, Xinlong

doi:10.1039/c6ra14190k

Cited by 52 publications

(37 citation statements)

References 55 publications

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“…The same enhancing effect can be observed in 50% mass loss (T 50 ). On the contrary, the maximum mass loss (T max ) are declined at all range of fillers loadings, which indicate that MOFs improve the thermal stability at the high‐temperature region (370 o C‐550 o C) …”

Section: Resultsmentioning

confidence: 97%

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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Section: Resultsmentioning

confidence: 97%

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

Zhai

Song

et al. 2019

Polymer Composites

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“…Based on the differential thermogravimetric profiles, they observed that onset of thermal degradation of PLLA dropped from 270 to 180 and 210 °C for PLLA‐5% CaO and PLLA‐5% MgO systems, respectively. Dai et al . fabricated PLA composites with Zn (II)‐pyridine 2,5‐dicarboxylate MOF.…”

Section: Resultsmentioning

confidence: 99%

“…They also observed decreased thermal stability of PLA at elevated tempeartures, which was ascribed to unzipping depolymerization. On the other hand, the degradation of PLA has been reported to be a complex phenomenon due to random scissions leading to linear and cyclic oligomers, which can potentially recombine leading to complex byproducts …”

Section: Resultsmentioning

confidence: 99%

Effect of MIL‐53 (Al) MOF particles on the chain mobility and crystallization of poly(L‐lactic acid)

Kathuria

Brouwers

Buntinx

et al. 2017

J of Applied Polymer Sci

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Polymer‐filler interactions significantly influence morphology, functionality, and various desirable properties of mixed matrix membranes (MMMs). In this study, chain mobility and crystallization of poly(l‐lactic acid) (PLLA) MMM films prepared by solvent casting PLLA with 1, 5, 10, and 20% wt/wt of MIL‐53(Al) metal organic framework (MOF) were evaluated. The fabricated MMMs were characterized using differential scanning calorimetry, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Differential scanning calorimetry studies indicated that the addition of MOF particles in the PLLA matrix reduces the polymeric chain mobility, which affects the crystallization process. The percent crystallinity of neat PLLA was found to decrease from 4% in neat PLLA to completely amorphous structures in PLLA‐10% and PLLA‐20% MMMs, as observed in the second heating cycle. Fourier transform infrared spectroscopy data supports these observations. Thermogravimetric analysis results showed that PLLA‐MOF films are thermally less stable than neat PLLA suggesting that MOF particles act as a depolymerization catalyst for PLLA. Partial agglomeration of MOF particles was observed in the samples using scanning electron microscopy studies. This study indicates strong PLLA‐MIL‐53(Al) MOF interactions. In addition, this study also provides insight into the effect of MOF particles on the segmental mobility and morphology of PLLA‐MIL‐53 (Al) composite films. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45690.

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“…[31][32][33] Unlike the direct catalytic conversion of sugars into LA derivatives or the development of MOF-PLA composites, the challenging separationo fL Af rom fermentation brothsh as surprisingly not yet been addressed by the MOF community. [34,35] Here we propose ap rocess in which the combination of adsorption on aM OF and reactive desorption allows the gypsum-free recovery of LA (Figure 1, green).…”

Section: Introductionmentioning

confidence: 98%

“…As reviewed by our group, initial studies focused on the separation of petrochemicals in apolar backgrounds, but attention moved to the separation of complex (e.g., chiral) compounds and to the isolation of bio‐based compounds from aqueous media . Unlike the direct catalytic conversion of sugars into LA derivatives or the development of MOF–PLA composites, the challenging separation of LA from fermentation broths has surprisingly not yet been addressed by the MOF community . Here we propose a process in which the combination of adsorption on a MOF and reactive desorption allows the gypsum‐free recovery of LA (Figure , green).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Reactive Desorption on Metal–Organic Frameworks: A Direct Strategy for Lactic Acid Recovery

et al. 2016

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Biomass-derived lactic acid (LA) is an important platform chemical towards the sustainable production of numerous materials. However, the fermentation process currently in use is limited by the difficult recovery of the LA product from the fermentation broth and results in the generation of stoichiometric amounts of gypsum waste. Herein, we show that metal-organic frameworks (MOFs) of the UiO-66(Zr) type are effective adsorbents for the separation of LA from aqueous (buffer) solutions. These frameworks based on zirconium clusters and terephthalic acid derivatives display a tremendous uptake (up to 42 wt %) and a high affinity for LA. The latter can further be tuned by changing the hydrogen-bonding properties of the functional groups present on the organic ligand. A Rietveld refinement disclosed the specific interaction of LA with the clusters of UiO-66(Zr) and a preferential adsorption on open zirconium sites. Taking advantage of the catalytic activity of UiO-66(Zr), desorption of LA was performed in alcohols to recover up to 73 % as ester. Applied to the recovery of LA, adsorption and reactive desorption offer a direct and gypsum-free strategy as an alternative for the current multi-step process.

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Non-isothermal crystallization kinetics, thermal degradation behavior and mechanical properties of poly(lactic acid)/MOF composites prepared by melt-blending methods

Abstract: In this article, poly(lactic acid)/metal–organic framework composites were prepared by melt-blending method and the effects of MOFs on the non-isothermal crystallization, thermal degradation and mechanical property of poly(lactic acid) were studied.

Cited by 52 publications

References 55 publications

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

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

Effect of MIL‐53 (Al) MOF particles on the chain mobility and crystallization of poly(L‐lactic acid)

Adsorption and Reactive Desorption on Metal–Organic Frameworks: A Direct Strategy for Lactic Acid Recovery

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