Hydrolytic degradation of poly(<scp>l</scp>‐lactic acid)/poly(methyl methacrylate) blends

Boudaoud, Naila; Benali, Samira; Mincheva, Rosica; Satha, Hamid; Raquez, Jean‐Marie; Dubois, Philippe

doi:10.1002/pi.5659

Cited by 17 publications

(10 citation statements)

References 63 publications

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“…In this regard, previous papers were discussed the opacity modification of PLA during the hydrolysis in buffered medium [ 40 , 41 ]. Indeed, this change of the opacity can be explained by various phenomena such as (i) the light scattering due to the absorbed water through the material, (ii) the formation of holes and then cracks on the surface as well as in the inner part of the specimens, (iii) the degradation products formed during the hydrolysis and (iv) the increase in PLA crystallinity [ 42 , 43 ]. It is worth noting that the opacity is more pronounced in the presence of copolymer.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Compatibilization into PLA/Mg Composites for Improved In Vitro Bioactivity and Stem Cell Adhesion

et al. 2021

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The present work highlights the crucial role of the interfacial compatibilization on the design of polylactic acid (PLA)/Magnesium (Mg) composites for bone regeneration applications. In this regard, an amphiphilic poly(ethylene oxide-b-L,L-lactide) diblock copolymer with predefined composition was synthesised and used as a new interface to provide physical interactions between the metallic filler and the biopolymer matrix. This strategy allowed (i) overcoming the PLA/Mg interfacial adhesion weakness and (ii) modulating the composite hydrophilicity, bioactivity and biological behaviour. First, a full study of the influence of the copolymer incorporation on the morphological, wettability, thermal, thermo-mechanical and mechanical properties of PLA/Mg was investigated. Subsequently, the bioactivity was assessed during an in vitro degradation in simulated body fluid (SBF). Finally, biological studies with stem cells were carried out. The results showed an increase of the interfacial adhesion by the formation of a new interphase between the hydrophobic PLA matrix and the hydrophilic Mg filler. This interface stabilization was confirmed by a decrease in the damping factor (tanδ) following the copolymer addition. The latter also proves the beneficial effect of the composite hydrophilicity by selective surface localization of the hydrophilic PEO leading to a significant increase in the protein adsorption. Furthermore, hydroxyapatite was formed in bulk after 8 weeks of immersion in the SBF, suggesting that the bioactivity will be noticeably improved by the addition of the diblock copolymer. This ceramic could react as a natural bonding junction between the designed implant and the fractured bone during osteoregeneration. On the other hand, a slight decrease of the composite mechanical performances was noted.

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Section: Resultsmentioning

confidence: 99%

Interfacial Compatibilization into PLA/Mg Composites for Improved In Vitro Bioactivity and Stem Cell Adhesion

et al. 2021

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“…It attracts considerable attention owing to its low cost, high optical transparency, high resistance to sunlight, low optical loss in the visible spectrum, shape-forming property, low glass transition temperature (T g ), excellent insulation properties and high thermal stability. 9 These special characteristics recommend PMMA for several applications such as nonlinear optics 10 and medical applications. 11 Rawat et al reported the possibility of using PMMA/ZnO composites in museums and art galleries to block harmful UV radiation falling on sensitive museum objects.…”

Section: Introductionmentioning

confidence: 99%

Electrical and optical properties of novel brilliant cresyl blue dye‐doped poly(methyl methacrylate) as selective cut‐off laser filters

El‐Gamal

Ismail

2020

Polymer International

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Dye doped polymer films of poly(methyl methacrylate) (PMMA) and brilliant cresyl blue (BCB) dye were synthesized using the solution casting technique. This work aims to investigate the influence of BCB dye doping on the structural, optical, dielectric and mechanical properties of PMMA. XRD reveals an increase in PMMA amorphicity with BCB loading. This suggests the solubility of BCB dye within PMMA. Fourier transform IR confirms the interaction between BCB dye and PMMA. The transmittance T of PMMA decreases with BCB doping and the cutoff transmission occurs in the ranges 200-366 nm and 560-660 nm for 2 wt% BCB doped film. The absorbance of PMMA deceases with ⊗ and loading BCB creates many absorption edges. The optical bandgaps of dye doped films are lower than that of PMMA. Urbach's energy increases from 0.52 to 0.86 eV on BCB doping. The dielectric constant ε 0 , dielectric loss ε 00 and AC conductivity ⊞ ac at room temperature as a function of frequency f, 100 Hz to1.0 MHz, and the doping level were studied. Loading dye increases ⊞ ac to higher values. The optical limiting results indicate that the dye doped films are highly attenuated for a laser beam of 638.2 nm. The dye incorporation enhances the mechanical performance of PMMA. It increases Young's modulus, tensile strength and elongation at break, which boosts the use of 1 wt% BCB doped film as a flexible laser attenuator. The excellent characteristics of novel BCB dye doped PMMA films present them as cutoff laser filters, laser attenuators, optoelectronic devices or in the semiconductor industry.

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“…Poly (lactic acid) (PLA, 4032D) in pellet form supplied by Nature Works LLC, with D-isomer < 2%, M n (PLA) ¼ 51.400 g.mol À1 , -D M ¼ 2.2 42 was used to modify the degradation behavior and enhance the ability of the PLA matrix. The organic fillers, Opuntia Ficus Indica flour is hereafter designated as OFI-F. OFI cladodes were collected from Skikda pilot plantation (480 Km from Algiers, Algeria).…”

Section: Methodsmentioning

confidence: 99%

Thermal degradation kinetics of Opuntia Ficus Indica flour and talc-filled poly (lactic acid) hybrid biocomposites by TGA analysis

Gharsallah

Layachi

Louaer

et al. 2021

Journal of Composite Materials

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This paper reports the effect of lignocellulosic flour and talc powder on the thermal degradation behavior of poly (lactic acid) (PLA) by thermogravimetric analysis (TGA). Lignocellulosic flour was obtained by grinding Opuntia Ficus Indica cladodes. PLA/talc/ Opuntia Ficus Indica flour (OFI-F) biocomposites were prepared by melt processing and characterized using Wide-angle X-ray scattering (WAXS) and Scanning Electron Microscope (SEM). The thermal degradation of neat PLA and its biocomposites can be identified quantitatively by solid-state kinetics models. Thermal degradation results on biocomposites compared to neat PLA show that talc particles at 10 wt % into the PLA matrix have a minor impact on the thermal stability of biocomposites. Loading OFI-F and Talc/OFI-F mixture into the PLA matrix results in a decrease in the maximum degradation temperature, which means that the biocomposites have lower thermal stability. The activation energies (Ea) calculated by the Flynn Wall Ozawa (FWO) and Kissinger Akahira Sunose (KAS) model-free approaches and by model-fitting (Kissinger method and Coats-Redfern method) are in good agreement with one another. In addition, in this work, the degradation mechanism of biocomposites is proposed using Coats-Redfern and Criado methods.

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Hydrolytic degradation of poly(l‐lactic acid)/poly(methyl methacrylate) blends

Cited by 17 publications

References 63 publications

Interfacial Compatibilization into PLA/Mg Composites for Improved In Vitro Bioactivity and Stem Cell Adhesion

Interfacial Compatibilization into PLA/Mg Composites for Improved In Vitro Bioactivity and Stem Cell Adhesion

Electrical and optical properties of novel brilliant cresyl blue dye‐doped poly(methyl methacrylate) as selective cut‐off laser filters

Thermal degradation kinetics of Opuntia Ficus Indica flour and talc-filled poly (lactic acid) hybrid biocomposites by TGA analysis

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