Crystallization behavior and spherulitic morphology of poly(lactic acid) films induced by casting process

Houichi, Hikmet; Maazouz, Abderrahim; Elleuch, Boubaker

doi:10.1002/pen.24028

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…It is clear that no peculiar diffraction peaks are found in the unfilled PLA samples. The two major diffraction peaks correspond to the (200)/(110) and (203) crystalline diffractions of PLA . When the concentration of Fe 3 O 4 increases, these two peaks are suppressed.…”

Section: Resultsmentioning

confidence: 99%

Crystallization behavior of polylactide matrix under the influence of nano‐magnetite

Gong

Cheng

Tang

et al. 2018

Polymer Engineering & Sci

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Iron oxide nanoparticle (Fe 3 O 4 ) has gained remarkable research interest for various applications, from environmental to biological, because of its superparamagnetic properties and good biocompatibility. In this work, the nucleation effect of Fe 3 O 4 in a polylactide (PLA) matrix under an influence of an alternating magnetic field was studied. The nanocomposite films that is, containing different concentrations of Fe 3 O 4 (~8 nm) which were uniformly dispersed in the PLA matrix, were prepared via a solution casting method. The amplitude and frequency of the magnetic field impose great effects on the morphology and nucleation rate of PLA crystallization. Thermogravimetric analysis was used to study the thermal stability of Fe 3 O 4 / PLA and it showed that the thermal stability of Fe 3 O 4 /PLA was affected by the Fe 3 O 4 content. Fourier transform infrared spectroscopy and X-ray diffractometry indicated that Fe 3 O 4 shows impeding effect to the crystallization of PLA. Based on the differential scanning calorimetry results, composite with 1% of Fe 3 O 4 content could promote the crystallization of PLA but it would become an obstacle when 3% of Fe 3 O 4 was added. The result of polarized optical microscopy also showed a good agreement that the incorporation of Fe 3 O 4 could act as an effective nucleation regent to the composite film. POLYM. ENG. SCI., 59:608-615, 2019.

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Section: Resultsmentioning

confidence: 99%

Crystallization behavior of polylactide matrix under the influence of nano‐magnetite

Gong

Cheng

Tang

et al. 2018

Polymer Engineering & Sci

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“…An increased crystallinity is achieved through adjustments in the processing conditions or the modification of material formulations. As the polymer melt exits the die, any stretching in either the machine or cross‐machine direction aligns molecules to create order, and this further increases the degree of crystallinity . The cooling rate of the polymer melt also affects the crystallization.…”

Section: Introductionmentioning

confidence: 99%

“…As the polymer melt exits the die, any stretching in either the machine or cross-machine direction aligns molecules to create order, and this further increases the degree of crystallinity. [20][21][22] The cooling rate of the polymer melt also affects the crystallization. As the cooling rate decreases, the degree of crystallinity increases because there is more time for the formation of crystallites.…”

Section: Introductionmentioning

confidence: 99%

Surface texture and barrier performance of poly(lactic acid)–cellulose nanocrystal extruded‐cast films

Liu

Matuana

2019

J of Applied Polymer Sci

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In this study, we assessed the influence of cellulose nanocrystal (CNC) addition level (0.5–2 wt %) on the surface texture, thickness, and barrier properties of poly(lactic acid) (PLA) extruded‐cast films. Regardless of the CNC content, the addition of CNC increased the surface average roughness and maximum roughness of the PLA films in both the machine and cross‐machine directions because of the presence of CNC agglomerates. The increased roughness resulted in films with uneven thicknesses; this affected their accurate measurements with a conventional micrometer. Rather, accurate thickness measurements were obtained through the density method, a more appropriate thickness measurement method for films with rough surfaces. The permeability values were negatively correlated with the increased crystallinity. Both the water vapor permeability and oxygen permeability (OP) values decreased significantly by approximately 26–45 and 25–50%, respectively, as the CNC content increased from 0.5 to 2 wt % because of the tortuosity effect. The OP values of the neat PLA and composite films remained insensitive to changes in the relative humidity (from 0 to 75%) when they were tested at 23 °C. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47594.

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“…To discern the temperature dependence of the linear growth rate of the rate of crystallization for secondary crystallization, Lauritzen–Hoffman equation was used to analyze the crystallization thermodynamic parameters. The crystallization rate G can be expressed by the following equation:

G= G_{0} \exp true[- \frac{U^{*}}{R (T_{c} - T_{\infty})} true] \exp true[- \frac{K_{g}}{T_{c} (Δ T) f} true]

where G 0 is a pre‐exponential term, U * is the activation energy of the molecular chains transferring through the crystalline region interface and is given by a universal value of 6280 J/mol, T c is the crystallization temperature, T ∞ = T g − C , C is a constant equal to 30, K g is an activation energy of nucleation, R is the universal gas constant, Δ T =

T_{m}^{0}

− T c ,

T_{m}^{0}

is the equilibrium melting temperature, and the factor f = 2 T c ( T c +

T_{m}^{0}

) is a correction coefficient for the decrease of the melting enthalpy with the crystallization temperature.…”

Section: Resultsmentioning

confidence: 99%

Isothermal and nonisothermal crystallization kinetics of fully bio‐based polyamides

Wei

Zhang

et al. 2016

Polymer Engineering & Sci

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We studied the crystallization behaviors of bio‐based BDIS polyamides synthesized from the following biomass monomers: 1,4‐butanediamine (BD), 1,10‐decanediamine (DD), itaconic acid (IA), and sebacic acid (SA). Isothermal crystallization, melting behavior, and nonisothermal crystallization of BDIS polyamides were investigated by differential scanning calorimetry (DSC). The Avrami equation was used to describe the isothermal crystallization of BDIS polyamides. The modified Avrami equation, the Ozawa equation, the modified Ozawa equation, and an equation combining the Avrami and Ozawa equations were used to describe the nonisothermal crystallization. The equilibrium melting point temperature of BDIS polyamide was determined to be 163.0°C. The Avrami exponent n was found to be in the range of 2.21–2.79 for isothermal crystallization and 4.10–5.52 for nonisothermal crystallization. POLYM. ENG. SCI., 56:829–836, 2016. © 2016 Society of Plastics Engineers

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Crystallization behavior and spherulitic morphology of poly(lactic acid) films induced by casting process

Cited by 7 publications

References 34 publications

Crystallization behavior of polylactide matrix under the influence of nano‐magnetite

Crystallization behavior of polylactide matrix under the influence of nano‐magnetite

Surface texture and barrier performance of poly(lactic acid)–cellulose nanocrystal extruded‐cast films

Isothermal and nonisothermal crystallization kinetics of fully bio‐based polyamides

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