Contribution of Catalytic Transesterification Reactions to the Compatibilization of Poly(lactic acid)/Polycarbonate Blends: Thermal, Morphological and Viscoelastic Characterization

Chelghoum, Nadjat; Guessoum, Melia; Fois, Magali; Haddaoui, N.

doi:10.1007/s10924-017-0950-4

Cited by 19 publications

(21 citation statements)

References 60 publications

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“…The PLA melting exotherm exhibits only one maximum at 175°C in the first heating scan and two maxima at T m1 of 170°C and T m2 of 177°C in the second heating run. The two exotherms are attributed to the ordered rhombic and disordered orthorhombic crystalline populations of PLA . Initially, PLA reveals a crystallinity of about 60%.…”

Section: Resultsmentioning

confidence: 99%

“…So, Huda et al studied the effect of fiber surface‐treatments on the properties of PLA/Kenaf fiber and deduced that the treated fiber composite offered superior mechanical properties compared to that based on untreated fibers. Also, Orue et al studied PLA/sisal fibers composites and pointed out the importance of alkaline treatment in increasing the composites performances. Analogously, Sreekala et al, Huda et al, Bledzki and Gassan, Karnani et al corroborated the positive effect produced by natural fibers modification on the whole performances of polymer composites, particularly mechanical properties and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Compatibilization of biocomposites based on sponge‐gourd natural fiber reinforced poly(lactic acid)

et al. 2019

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To prepare fully biodegradable materials, variable concentrations of luffa fiber (LF) namely 1, 3, and 5 phr, were incorporated into a poly(lactic acid) (PLA) matrix. To counteract the poor adhesion of the LF to PLA, a compatibilizer which is maleic anhydride‐grafted poly(lactic acid) has been incorporated and the properties of the composites with and without compatibilizer noted, respectively, PLA/LF and PLA/PLA‐g‐maleic anhydride (MA)/LF, were compared. The final torque of PLA/LF was found to decrease with the LF content contrary to that of PLA/PLA‐g‐MA/LF composite which was seen to increase as a result of the interfacial reaction occurring between maleic anhydride groups of the compatibilizer and the hydroxyls of LF. This outcome has been evidenced from the Fourier transform infrared spectroscopy which pointed out the disappearance of the vibration band owing to the anhydride groups of the compatibilizer from the spectra of the PLA/PLA‐g‐MA/LF composite and the better impregnation of LF by the matrix as it has been observed from scanning electron microscopy. Subsequently, the Izod impact strength of the compatibilized composites was seen to increase, especially for 1 phr of LF, whereas the water uptake aptitude was considerably reduced. Also, PLA phase into the composites exhibited lower thermal stability and glass transition temperature compared to pristine PLA.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compatibilization of biocomposites based on sponge‐gourd natural fiber reinforced poly(lactic acid)

et al. 2019

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“…Furthermore, the cold crystallization peak of PLA appears at 112°C with a crystallization enthalpy of 59 J g −1 . The bimodal melting behavior of PLA is typical of polyesters and semi‐crystalline polymers and corresponds to the presence of two crystalline phases, namely the disordered and ordered pseudo‐orthorhombic structures of various lamellar thicknesses and degree of perfection .…”

Section: Resultsmentioning

confidence: 99%

“…Also, compared to conventional polymers, PLA presents a relatively low melt strength, which is a critical limitation for its processing by thermoforming, blowing, and foaming . To remedy PLA deficiencies, various strategies such as blending , reinforcing by mineral and cellulosic fillers , copolymerization , and plasticization have been proposed and found to induce beneficial changes particularly on mechanical, thermal, and rheological properties.…”

Section: Introductionmentioning

confidence: 99%

Appraisal of ε‐Caprolactam and Trimellitic Anhydride Potential as Novel Chain Extenders for Poly(lactic acid)

Mayouf

Guessoum

Fuensanta

et al. 2020

Polymer Engineering & Sci

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The potential of ε-caprolactam (CAP) and trimellitic anhydride (TMA) compounds as novel chain extenders for poly(lactic acid) (PLA) has been assessed; the amounts of 0.01, 0.025, and 0.05 wt% each additive have been added. The chain extension was evidenced by the increase in PLA/CAP and PLA/TMA viscosities in mixing torque measurements and by infrared spectroscopy. PLA reaction with CAP and TMA has also been confirmed from contact angle and surface free energy studies, which have shown that the increase in TMA amount decreased the hydrophilicity of PLA due to the decreased concentration of terminal surface hydroxyl groups. However, the addition of CAP accentuated the PLA hydrophilicity as indicated by the increase in the polar component of the surface energy. On the other hand, the glass transition temperature of PLA/TMA and PLA/CAP decreased as a result of a local plasticizing effect, which favored the chain mobility and the crystallization of PLA due to the concomitant nucleating effect of the chain extenders moieties too. Furthermore, the higher molecular weight of PLA/CAP and PLA/TMA was responsible for their increased thermal stability and higher impact strength with respect to PLA. POLYM. ENG. SCI., 60:944-955, 2020.

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“…After mixing with PC, the T g of the PLA phase is unchanged due to the blend immiscibility. But after adding the catalyst, the PLA T g and melting temperatures decrease contrary to the crystallization exotherm which shifts to higher temperatures due to the PLA reduced aptitude to crystallization resulting from the transfer of bulky PC units [5]. The addition of 3% of MMT to the uncatalyzed blend causes a slight increase in the crystallization temperature due to the disturbing effect of the nanoclay.…”

Section: Thermal Properties and Microstructure Analysismentioning

confidence: 97%

Reactive Compatibilization of Poly(lactic acid) and Polycarbonate Blends Through Catalytic Transesterification Reactions

Guessoum

Chelghoum

Haddaoui

2019

International Journal of Computational and Experimental Science and Engineering

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The combination of poly(lactic acid) (PLA) with polycarbonate (PC) which presents high inherent thermal stability and mechanical properties is an attractive strategy to overcome PLA brittleness and poor thermal resistance. To improve affinity between the two materials and their dispersion into the blend, an organophilic montmorillonite (MMT) has been added and reactive compatibilization through catalyzed transesterification has been investigated. The properties were studied using differential scanning calorimetry (DSC), thermogravimetry (TG), dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). The study of the thermal properties revealed the immiscibility of the uncatalyzed blend but noticeable changes were detected on the PLA crystallization and melting behaviors after the addition of the catalyst. The SEM observations showed that MMT and the catalyst contribute in the improvement of the dispersion. The TG results revealed that MMT increases the thermal stability of the blend and showed new stages of decomposition due to the different structures resulting from the interchange reactions.

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Contribution of Catalytic Transesterification Reactions to the Compatibilization of Poly(lactic acid)/Polycarbonate Blends: Thermal, Morphological and Viscoelastic Characterization

Cited by 19 publications

References 60 publications

Compatibilization of biocomposites based on sponge‐gourd natural fiber reinforced poly(lactic acid)

Compatibilization of biocomposites based on sponge‐gourd natural fiber reinforced poly(lactic acid)

Appraisal of ε‐Caprolactam and Trimellitic Anhydride Potential as Novel Chain Extenders for Poly(lactic acid)

Reactive Compatibilization of Poly(lactic acid) and Polycarbonate Blends Through Catalytic Transesterification Reactions

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