Effect of ozone exposure on thermal and structural properties of polylactide based composites

Olewnik-Kruszkowska, Ewa; Nowaczyk, Jacek; Kadac, Kornelia

doi:10.1016/j.polymertesting.2016.10.030

Cited by 16 publications

(17 citation statements)

References 37 publications

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“…It is a biodegradable polymer from renewable resources. Not only can polymer waste pollution be reduced by easy degradation, but advantageous optical, chemical, and sufficient mechanical properties also make PLA a requested material for packaging, food, and biomedical applications [2][3][4][5]. Further improvement of the PLA properties, like adjusted thermal conductivity or increased strength, can be achieved by reinforcement with particles and fibres [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Processing and Wear Behaviour of 3D Printed PLA Reinforced with Biogenic Carbon

Ertane

Dorner-Reisel

Baran

et al. 2018

Advances in Tribology

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For the first time, biocarbon reinforced polylactide (PLA) filaments were available for the 3D printing. Biocarbon is the carbon obtained from trees, plants, and soils to naturally absorb and store carbon dioxide from the atmosphere. One of the most important features is renewability. Because of this, it has been decided to reinforce PLA with biocarbon to obtain 100% recyclable material. Although PLA has been used in 3D printing for a long time, more applications like housings or structural interior of automobiles or other vehicles can be realised, if the mechanical and tribological properties are improved. Because the new PLA/biocarbon reinforced composites are degradable, they can be used as soil improvement after end of life as a structural material. The filaments were produced by compounding the biocarbon with polylactide granulate. Biocarbon was produced by pyrolysis of wheat stems at 800 ∘ C. The biomass were collected from different regions in Germany, Europe. As shown by Raman spectroscopy, the in-plane crystallite size of pyrolysed wheat stems from different regions is almost similar and amounts to 2.35 ±0.02 nm. Biocarbon particles were successfully integrated into the polylactide. Filaments of 1.75 mm diameter were produced for 3D (3-dimensional) printing. Filaments with 5 vol.-%, 15 vol.-%, and 30 vol.-% biocarbon were extruded. The fused deposition modelling (FDM) printing process was slightly hindered at higher biocarbon loading. Based on optical and scanning electron microscopy, a very homogeneous particle distribution can be observed. Single carbon particles stick out of the filament surface, which may be a reason for enhanced nozzle wear during 3D printing. Friction is more stable for 30 vol.-% reinforced PLA in comparison to unreinforced PLA and composites with lower particle fraction. This effect could be caused by some topographical effects due to void generation at the surface of PLA with 30 vol.-% biocarbon. In general, the tribological resistance increases with higher volume fraction of biocarbon.

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Section: Introductionmentioning

confidence: 99%

Processing and Wear Behaviour of 3D Printed PLA Reinforced with Biogenic Carbon

Ertane

Dorner-Reisel

Baran

et al. 2018

Advances in Tribology

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“…or (12) If the variances are equal, then a test based on the Student's t-distribution is used for verification (13). (13) If the test of the equality hypothesis demonstrates that variances are different, a test based on the Cochran-Cox adjustment is used (14).…”

Section: Resultsmentioning

confidence: 99%

“…Such technologies include bonding, the airtight sealing of structures, coating, printing, sintering technologies, and many more [1,3,8,10,12]. The efficient joining of construction materials requires the correct preparation of the surfaces of bonded elements and the selection of adhesives and sealants with the best properties.…”

Section: Introductionmentioning

confidence: 99%

Determining the Value of Surface Free Energy on the Basis of the Contact Angle

Kłonica¹,

Kuczmaszewski²

2017

Adv. Sci. Technol. Res. J.

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This paper presents the results of tests concerning the value of surface free energy on the basis of measurements of contact angle with measure liquids: distilled water and diiodomethane. The surface of steel-316L samples was modified in an ozone atmosphere, and the concentration of ozone and the conditioning time of the samples in the reaction chamber were changed. The results of tests concerning the measurements of the value of surface free energy were subject to analysis. Also analysed were the components of SFE: the polar and dispersive components. The obtained test results were analysed in statistical terms. The paper ends with conclusions.

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“…Despite the permanent contact of the gas-oxidizer with biomedical and packaging polymers during service, the influences of ozone on the morphology and dynamic characteristics of biodegradable polymers remain a poorly studied topic of polymer science. Despite this, quite recently, the commercialization of PHB and PLA owing to their cost reduction and increasing biomedical demands gave rise to several comprehensive papers devoted to the kinetics and mechanism of the ozonolysis of the biopolyesters [ 34 ]. The additional relevant information concerning the two-step consecutive mechanism of ozonolysis is provided in the Section 3.3 of the present publication.…”

Section: Introductionmentioning

confidence: 99%

Aggressive Impacts Affecting the Biodegradable Ultrathin Fibers Based on Poly(3-Hydroxybutyrate), Polylactide and Their Blends: Water Sorption, Hydrolysis and Ozonolysis

et al. 2021

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Ultrathin electrospun fibers of pristine biopolyesters, poly(3-hydroxybutyrate) (PHB) and polylactic acid (PLA), as well as their blends, have been obtained and then explored after exposure to hydrolytic (phosphate buffer) and oxidative (ozone) media. All the fibers were obtained from a co-solvent, chloroform, by solution-mode electrospinning. The structure, morphology, and segmental dynamic behavior of the fibers have been determined by optical microscopy, SEM, ESR, and others. The isotherms of water absorption have been obtained and the deviation from linearity (the Henry low) was analyzed by the simplified model. For PHB-PLA fibers, the loss weight increments as the reaction on hydrolysis are symbate to water absorption capacity. It was shown that the ozonolysis of blend fibrils has a two-stage character which is typical for O3 consumption, namely, the pendant group’s oxidation and the autodegradation of polymer molecules with chain rupturing. The first stage of ozonolysis has a quasi-zero-order reaction. A subsequent second reaction stage comprising the back-bone destruction has a reaction order that differs from the zero order. The fibrous blend PLA/PHB ratio affects the rate of hydrolysis and ozonolysis so that the fibers with prevalent content of PLA display poor resistance to degradation in aqueous and gaseous media.

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Effect of ozone exposure on thermal and structural properties of polylactide based composites

Cited by 16 publications

References 37 publications

Processing and Wear Behaviour of 3D Printed PLA Reinforced with Biogenic Carbon

Processing and Wear Behaviour of 3D Printed PLA Reinforced with Biogenic Carbon

Determining the Value of Surface Free Energy on the Basis of the Contact Angle

Aggressive Impacts Affecting the Biodegradable Ultrathin Fibers Based on Poly(3-Hydroxybutyrate), Polylactide and Their Blends: Water Sorption, Hydrolysis and Ozonolysis

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