Crystallization of Poly(ϵ-caprolactone) composites with graphite nanoplatelets: Relations between nucleation and platelet thickness

Lv, Qiaolian; Wu, Defeng; Qiu, Yaxin; Chen, Jianxiang; Yao, Xin; Ding, Kunshan; Wei, Nengxin

doi:10.1016/j.tca.2015.05.005

Cited by 36 publications

(19 citation statements)

References 54 publications

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“…The better mGO dispersion in the molten state at 0.1 wt%, which is confirmed by higher viscosity, allows the formation, during the crystallization process, of more nucleation sites homogeneously distributed in the polymer, leading to the formation of thinner crystalline lamellae as revealed from DSC, XRD, and SAXS experiments. [ 54‐56 ]…”

Section: Resultsmentioning

confidence: 99%

“…[32] The better mGO dispersion in the molten state at 0.1 wt%, which is confirmed by higher viscosity, allows the formation, during the crystallization process, of more nucleation sites homogeneously distributed in the polymer, leading to the formation of thinner crystalline lamellae as revealed from DSC, XRD, and SAXS experiments. [54][55][56] The storage modulus (G') as a function of the loss modulus (G"), also commonly known as the Han plot, [57] was also analyzed for every composite, as shown in Figure 7.…”

Section: Steady Shear and Dynamic Oscillatory Testsmentioning

confidence: 99%

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Crystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites

Pinto

Silva

Santillo

et al. 2020

Polymer Engineering & Sci

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This work aims to produce poly(ethylene terephthalate)/multilayer graphene oxide (mGO) nanocomposites via continuous melt mixing in twin-screw extrusion, and to study the changes in crystallization and melt flow behavior. Three mGO contents (0.05, 0.1, and 0.3 wt%) were used. Differential scanning calorimetry analyses showed that at 0.1 wt%, mGO acted best as nucleating agent, increasing the crystallization kinetics as well as the melt crystallization temperature (T mc) by more than 20%. It was also observed that mGO increases the crystals perfection. The nucleating behavior was confirmed by X-ray diffraction and small angle X-ray scattering analyses, which showed a decrease in the composites' crystalline lamella thickness (l c) and long period. X-ray microtomography data confirms that this behavior is significantly affected by the mGO agglomerates distribution and specific surface area inside the polymer matrix. The rheological behavior was studied under two different conditions. It was noticed that under lower shear stresses the mGO particles hinder the polymer flow, increasing the composites viscosity and the pseudo-solid character. However, under higher shear stresses, for example, when flowing through a die, the nanomaterial enters its "superlubricity state," acting as a lubricant to the flow. This is industrially interesting, because it may allow the use of less severe processing parameters to produce the nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Section: Steady Shear and Dynamic Oscillatory Testsmentioning

confidence: 99%

Crystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites

Pinto

Silva

Santillo

et al. 2020

Polymer Engineering & Sci

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show abstract

“…However, for 50/50GA and 30/70GA, the interfacial interactions between the GO nanosheets and the PCL molecular chains might have been reduced the chain motility and increased the crystallization activation energy. 27 Therefore the crystalinity was decreased even though there were still a fraction of GO dispersed in PCL phase serving as nuclei. While for the PLA phase, because the crystallization capacity was low and the heterogenous nucleation effect was more dominant when the PLA was the minor phase.…”

Section: The Effects Of Go On the Crystallization Of Blended Nanofibersmentioning

confidence: 99%

Selective localization of graphene oxide in electrospun polylactic acid/poly(ε-caprolactone) blended nanofibers

Wang

Gao

et al. 2017

Polymer Testing

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Despite their immiscibility, blending polylactic acid (PLA) with poly(ε-caprolactone) (PCL) provides an efficient strategy for obtaining a biopolymer blend with tailored properties due to their complementary physical properties. In this study, graphene oxide (GO) was employed as a 2-D nanofiller and nucleating agent to improve the properties of the immiscible PLA/PCL blends at 70/30, 50/50, and 30/70 weight ratios. Nanofibers of PLA/PCL blends and PLA/PCL/GO composites were investigated. It was interesting to find that the GO selectively localized in the minor phase resulting from the phase separation. The selective localization of the GO as the nucleating agent had an influence on the degree of crystallinity and crystalline morphology in the blended composites. This study also demonstrated that the molecular chains in the PLA phase oriented along the fiber axes, while in the PCL phase, the partial crystallites changed their orientation direction to be perpendicular to the fiber axes with the addition of GO.

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“…Probably ZnO particles act as heterogeneities decreasing the nucleation energy and increasing PCL crystallization rates. The literature presents works where the addition of additives, polymers and fibers modify the crystallization mechanisms and the morphological structure of PCL, see for examples bamboo cellulose/PCL composites [5], PCL/SiO 2 [7], PBT/PCL blends [8], PCL/graphite nanoplatelets [9]. Scanning electron microscopy images for PCL compounds are presented in Figure 6, these images were captured from gold coated PCL films, no other thermal or chemical treatment was done.…”

Section: Figurementioning

confidence: 99%

“…The market demand for biodegradable polymers has been increasing rapidly, which is highly encouraged by environmental management policies. After disposal, PCL is rapidly biodegraded (~ 6 months in suitable medium), producing nontoxic low molecular weight compounds [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

PCL/ZnO Bio-friendly Films as Food Packaging Material.Thermal and morphological analysis

et al. 2018

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Films of Poly(-caprolactone) (PCL) and PCL/Zinc Oxide (ZnO) were obtained by solution processing. Thermal behaviour and morphological structure were analysed by means of Thermogravimetry (TGA), Differential Scanning Calorimetry (DSC), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The addition of ZnO to PCL decreased the degradation temperature about 50-70°C; the films are thermally stable up to 200°C, making them suitable for packaging hot grilled chicken. ZnO did not promote significant alterations of the PCL fusion and melt crystallization, however the crystallinity increased; probably ZnO acts as nucleating agent during PCL crystallization as OM images showed greater amount of small spherulites on PCL/ZnO films. According to SEM, the methodology utilized is adequate for producing films in concentrations up to 5% ZnO.

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Crystallization of Poly(ϵ-caprolactone) composites with graphite nanoplatelets: Relations between nucleation and platelet thickness

Cited by 36 publications

References 54 publications

Crystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites

Crystallization kinetics, structure, and rheological behavior of poly(ethylene terephthalate)/multilayer graphene oxide nanocomposites

Selective localization of graphene oxide in electrospun polylactic acid/poly(ε-caprolactone) blended nanofibers

PCL/ZnO Bio-friendly Films as Food Packaging Material.Thermal and morphological analysis

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