Creep Behavior of Poly(lactic acid) Based Biocomposites

Morreale, Margherita; Mistretta, Maria Chiara; Fiore, Vincenzo

doi:10.3390/ma10040395

Cited by 23 publications

(19 citation statements)

References 45 publications

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“…Creep tests were performed at a temperature of 80 °C on both of the materials, by applying a stress of 1.5 MPa in a dedicated apparatus produced by IDEA (Termini Imerese, Italy), described in previous works [19,20,21]. Specifically regarding the UV source, it is obtained by using a chilled and filtered UV lamp (Osram UVA, 300 W, Munich, Germany), with the main wavelengths within the 350–2500 nm range and the measured photon flux (in the 280–320 nm wavelength range), about 348 mW/cm 2 , with the samples located at approx.…”

Section: Methodsmentioning

confidence: 99%

Photooxidation Behavior of a LDPE/Clay Nanocomposite Monitored through Creep Measurements

et al. 2017

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Abstract:Creep behavior of polymer nanocomposites has not been extensively investigated so far, especially when its effects are combined with those due to photooxidation, which are usually studied in completely independent ways. In this work, the photooxidation behavior of a low density polyethylene/organomodified clay nanocomposite system was monitored by measuring the creep curves obtained while subjecting the sample to the combined action of temperature, tensile stress, and UV radiation. The creep curves of the irradiated samples were found to be lower than those of the non-irradiated ones and progressively diverging, because of the formation of branching and cross-linking due to photooxidation. This was further proved by the decrease of the melt index and the increase of the intrinsic viscosity; at the same time, the formation of carbonyl groups was observed. This behavior was more observable in the nanocomposite sample, because of its faster photooxidation kinetics.

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Section: Methodsmentioning

confidence: 99%

Photooxidation Behavior of a LDPE/Clay Nanocomposite Monitored through Creep Measurements

et al. 2017

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“…89 The flax-PLA composite showed higher tensile strength as compared to pure PLA and jute-PLA composites. 90 The tensile strength of pure cellulose is increased by 20% when amalgamated with the tamarind nut powder. 91 The maximum tensile modulus of short isora fiber reinforced natural rubber composites is observed for a critical fiber length of 10 mm.…”

Section: Effects On Tensile and Flexural Propertiesmentioning

confidence: 99%

Tensile and flexural properties of natural fiber reinforced polymer composites: A review

Khan

Srivastava

Gupta

2018

Journal of Reinforced Plastics and Composites

165

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In recent years, researchers and scientists are facing problems in terms of environmental imbalance and global warming owing to numerous use of composite materials prepared by synthetic fibers and petrochemical polymers. Hence, an increasing attention has been devoted to the research and development of polymer composites reinforced with the natural fibers. The natural fibers are the most suitable alternative of synthetic fibers due to their biodegradability, eco-friendliness and acceptable mechanical properties. The natural fibers are attracting the researchers and scientists to exploit their properties by amalgamating them with the polymer. The properties of natural fiber reinforced polymer composites mainly depend upon various factors such as properties of fibers and matrices, fiber loading percentage, size and orientation of fibers, stacking sequences, degree of interfacial bonding, fiber surface treatments, hybridization and incorporation of additives and coupling agents. Tensile and flexural tests are the most important investigations to predict the applications of the materials. A good number of research has been carried out on tensile and flexural properties of natural fiber reinforced polymer composites. In this paper, a review on tensile and flexural properties of natural fiber reinforced polymer composites in terms of effects of fiber weight fraction, geometry, surface treatments, orientations and hybridization is presented. Moreover, recent applications of natural fiber reinforced polymer composites are also presented in this study.

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“…In any case, while different researchers have investigated PLA toughened with biodegradable rubber, in which they stated that certainly the size of the dispersed particles, together with the quality of interfacial adhesion, determines the final toughening effect in PLA [34][35][36][37][38][39][40], only a few papers studied the short-time creep behavior of PLA-based blends [41][42][43], and none of them addressed the issue of relating micromechanical deformation phenomena with volumetric dilatometric variations from creep tests. For this reason, in this work, measurements of the volume strain, using an optical extensometer, were conducted with a universal testing machine in creep configuration to determine, accompanied by SEM images, the micromechanical deformation processes involved in a biopolymeric blend system.…”

Section: Introductionmentioning

confidence: 99%

Volume Change during Creep and Micromechanical Deformation Processes in PLA–PBSA Binary Blends

et al. 2021

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In this paper, creep measurements were carried out on poly(lactic acid) (PLA) and its blends with poly(butylene succinate-adipate) (PBSA) to investigate the specific micromechanical behavior of these materials, which are promising for replacing fossil-based plastics in several applications. Two different PBSA contents at 15 and 20 wt.% were investigated, and the binary blends were named 85-15 and 80-20, respectively. Measurements of the volume strain, using an optical extensometer, were carried out with a universal testing machine in creep configuration to determine, accompanied by SEM images, the deformation processes occurring in a biopolymeric blend. With the aim of correlating the creep and the dilatation variation, analytical models were applied for the first time in biopolymeric binary blends. By using an Eyring plot, a significant change in the curves was found, and it coincided with the onset of the cavitation/debonding mechanism. Furthermore, starting from the data of the pure PLA matrix, using the Eyring relationship, an apparent stress concentration factor was calculated for PLA-PBSA systems. From this study, it emerged that the introduction of PBSA particles causes an increment in the apparent stress intensity factor, and this can be ascribed to the lower adhesion between the two biopolymers. Furthermore, as also confirmed by SEM analysis, it was found that debonding was the main micromechanical mechanism responsible for the volume variation under creep configuration; it was found that debonding starts earlier (at a lower stress level) for the 85-15 blend.

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Creep Behavior of Poly(lactic acid) Based Biocomposites

Cited by 23 publications

References 45 publications

Photooxidation Behavior of a LDPE/Clay Nanocomposite Monitored through Creep Measurements

Photooxidation Behavior of a LDPE/Clay Nanocomposite Monitored through Creep Measurements

Tensile and flexural properties of natural fiber reinforced polymer composites: A review

Volume Change during Creep and Micromechanical Deformation Processes in PLA–PBSA Binary Blends

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