Study on the Crystallization, Miscibility, Morphology, Properties of Poly(lactic acid)/Poly(ε-caprolactone) Blends

In order to improve compatibility and composite properties of pineapple leaf fibers/polyamide 6 composite, alkaline and silane treatments were conducted for fiber modification. Effect of fiber surface treatment on the properties of the composites was investigated. Untreated and treated fibers were raw (R-PALF), alkaline treated (Na-PALF) and silane treated pineapple leaf fibers (Si-PALF). Fiber loading was varied in polyamide 6 based composite. Morphology and fiber-matrix interfacial adhesion, thermal and mechanical properties were examined. Surface treatments can improve interfacial adhesion between these two phases. All PALFs have enhanced thermal stability of all composites. However, thermal characteristics of the composites, i.e. T c , T m and crystallinity, have not been affected by PALF types. Na-PALF and Si-PALF help improving mechanical properties of the composites. Young's modulus and tensile strength have been increased whereas elongation decreased by both treated PALFs which indicates that the composites become stiffer and stronger but less flexible. From the results, it could be stated that alkali treatment is sufficient to improve compatibility and properties of the PALF/polyamide 6 composites at fiber loading of 30 %wt.

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“…Crystallization temperature, melting temperature and crystallinity were examined. Crystallinity was calculated according to Eq.1 [17]:…”

Section: Characterization and Testingmentioning

confidence: 99%

Effect of Surface Treatment on the Properties of Pineapple Leaf Fibers Reinforced Polyamide 6 Composites

et al. 2014

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“…Also, few studies have used flexible polymers with PLA. PLA can be blended with flexible polymers such as poly (ε-caprolactone) (PCL), poly (buthylene succinate) (PBS), and poly (butylene succinate adipate) (PBSA) to achieve the flexibility and high elongation the brittleness of PLA and improves strain at break [1][2][3][4][5][6].It is well known that blending of polymer is the most cost-effective way to obtain material with required properties. The miscibility of two polymers can be determined by the Gibbs free energy of mixing by using the solubility parameter value of the two polymers [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of PCL and Compatibility Contents on the Morphology, Crystallization and Mechanical Properties of PLA/PCL Blends

2016

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This study focused on the effect of PCL on crystalline morphology, isothermally crystallization of PLA in PLA/PCL blends using POM on investigation. The blend with Pluronic used as a plasticizer was also studied. The blends were prepared by melt blending in an internal mixer. The contents of PCL incorporated were varied from 0-30 % by weight. The content of Pluronic used in this study was at 2.5, 5 and 7.5 phr. The blends were characterized for their morphology, crystallization and mechanical properties. Melt strength of the blends was also investigated. The morphology of the blends confirmed immiscibility of two polymer phases. Scanning electron microscope (SEM) of PLA/PCL blends indicated larger particle size of PCL dispersed in PLA with the increase of PCL contents. T g of PLA in the blend could not be observed on Differential Scanning Calorimetry (DSC) traces. This was due to the overlapping with T m of PCL. The presence of Pluronic in PLA/PCL blends resulted in T m s shifting to slightly lower temperatures. The crystallinity of PLA was also decreased. The spherulitic growth of PLA in blends was followed by polarized optical microscope using isothermal condition at 141 C. The spherulite structure was found affected by the presence of Pluronic hence effect on crystallization of PLA. Tensile properties of PLA/PCL blend were suffered with PCL content except for elongation at break which seems to be enhanced. It was found that the presence of pluronic in PLA/PCL blend increased ductility of the blends. At Plurunic of 2.5 phr and PCL content of 10-20 % by weight, tensile strength of these blends was increased. This was explained by the fine dispersed PCL particles facilitated orientation of PLA chain after proportional limit and hence increased tensile strength. With higher content both PCL and Pluronic, large PCL particle size was disadvantaged for tensile properties.

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“…Therefore, PCL can be blended with other polymers to improve stress crack resistance, dye-ability, and adhesion [13]. High flexibility PCL can be considered as a good plasticizer for PLA compared to low molecular weight plasticizers as it does not migrate to the surface of the blended samples and the physical properties cannot be debased [14].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical and Thermal Properties of Polylactic Acid/Polycaprolactone Blends by Hydrophilic Nanoclay

Eng

Ibrahim

Zainuddin

et al. 2013

Indian Journal of Materials Science

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The effects of hydrophilic nanoclay, Nanomer PGV, on mechanical properties of Polylactic Acid (PLA)/Polycaprolactone (PCL) blends were investigated and compared with hydrophobic clay, Montmorillonite K10. The PLA/PCL/clay composites were prepared by melt intercalation technique and the composites were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). FTIR spectra indicated that formation of hydrogen bond between hydrophilic clay with the matrix. XRD results show that shifting of basal spacing when clay incorporated into polymer matrix. TEM micrographs reveal the formation of agglomerate in the composites. Based on mechanical properties results, addition of clay Nanomer PGV significantly enhances the flexibility of PLA/PCL blends about 136.26%. TGA showed that the presence of clay improve thermal stability of blends. DMA show the addition of clay increase storage modulus and the presence of clay Nanomer PGV slightly shift two of blends become closer suggest that the presence of clay slightly compatibilizer the PLA/PCL blends. SEM micrographs revealed that presence of Nanomer PGV in blends influence the miscibility of the blends. The PLA/PCL blends become more homogeneous and consist of single phase morphology.

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Study on the Crystallization, Miscibility, Morphology, Properties of Poly(lactic acid)/Poly(ε-caprolactone) Blends

Cited by 114 publications

References 29 publications

Effect of Surface Treatment on the Properties of Pineapple Leaf Fibers Reinforced Polyamide 6 Composites

Effect of Surface Treatment on the Properties of Pineapple Leaf Fibers Reinforced Polyamide 6 Composites

Effect of PCL and Compatibility Contents on the Morphology, Crystallization and Mechanical Properties of PLA/PCL Blends

Enhancement of Mechanical and Thermal Properties of Polylactic Acid/Polycaprolactone Blends by Hydrophilic Nanoclay

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