Complex study of the physical properties of a poly(lactic acid)/poly(3-hydroxybutyrate) blend and its carbon black composite during various outdoor and laboratory ageing conditions

Mosnáčková, Katarína; Danko, Martin; Šišková, Alena Opálková; Falco, Lorena; Janigová, Ivica; Chmela, Štefan; Vanovčanová, Zuzana; Omaníková, Leona; Chodák, Ivan; Mosnáček, Jaroslav

doi:10.1039/c7ra08869h

Cited by 22 publications

(18 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the thermograms of the first heating [Figure (a)], it is possible to observe three transitions for the neat PLA: the glass transition temperature ( T g ) at 59 °C, an exothermic event at 88 °C corresponding to the cold crystallization, and finally, the crystalline melting temperature ( T m ) at 175 °C, results close to those found by Singla et al . and Mosnácková et al . Qin et al .…”

Section: Resultsmentioning

confidence: 95%

Preparation and characterization of antistatic packaging for electronic components based on poly(lactic acid)/carbon black composites

Silva

Menezes

Montagna

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(lactic acid) (PLA) is a biodegradable aliphatic polymer obtained from renewable sources; its main application is in the packaging sector. Electronic components require the use of antistatic packaging that prevents damage and electric shock. As PLA has no conductive characteristics, it requires the addition of allotropic carbon forms such as conductive carbon black to make the polymer less resistive as the dissipative material and making it suitable for the manufacture of antistatic packaging. In this study, PLA was melt blended with 5, 10, and 15 wt % of carbon black. The composites were prepared using a high‐speed mixer. Samples were characterized by Izod impact resistance tests, scanning electron microscopy, thermal properties, electrical characterization, and biodegradation tests in garden soil. The addition of carbon black in the PLA matrix increases the temperature of degradation and decreases the crystallinity degree and the impact resistance of the composites. However, carbon black is a great option to increase the electrical conductivity of PLA. The addition of carbon black in PLA makes the composite less resistive and suitable for use as antistatic packaging for the transportation and storage of electronic components. Furthermore, this composite does not cause damage to the environment as the carbon black does not interfere in the degradation mechanism of PLA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47273.

show abstract

Section: Resultsmentioning

confidence: 95%

Preparation and characterization of antistatic packaging for electronic components based on poly(lactic acid)/carbon black composites

Silva

Menezes

Montagna

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…First of all, the addition of fillers generally enhances the mechanical properties of polymer composites [ 105 ]. Secondly, the TiO 2 nanoparticles presented a nucleation effect, leading to the formation of thinner crystals during both the preparation and degradation of the samples [ 106 ]. Lastly, the TiO 2 particles showed a low affinity for PHBV [ 95 , 99 ], acting as a protection barrier during the weathering attack.…”

Section: Resultsmentioning

confidence: 99%

Accelerated Weathering Effects on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV/TiO2 Nanocomposites

et al. 2020

View full text Add to dashboard Cite

The effect of accelerated weathering on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV-based nanocomposites with rutile titanium (IV) dioxide (PHBV/TiO2) was investigated. The accelerated weathering test applied consecutive steps of UV irradiation (at 340 nm and 0.76 W m−2 irradiance) and moisture at 50 °C following the ASTM D4329 standard for up to 2000 h of exposure time. The morphology, chemical structure, crystallization, as well as the mechanical and thermal properties were studied. Samples were characterized after 500, 1000, and 2000 h of exposure time. Different degradation mechanisms were proposed to occur during the weathering exposure and were confirmed based on the experimental data. The PHBV surface revealed cracks and increasing roughness with the increasing exposure time, whereas the PHBV/TiO2 nanocomposites showed surface changes only after 2000 h of accelerated weathering. The degradation of neat PHBV under moisture and UV exposure occurred preferentially in the amorphous phase. In contrast, the presence of TiO2 in the nanocomposites retarded this process, but the degradation would occur simultaneously in both the amorphous and crystalline segments of the polymer after long exposure times. The thermal stability, as well as the temperature and rate of crystallization, decreased in the absence of TiO2. TiO2 not only provided UV protection, but also restricted the physical mobility of the polymer chains, acting as a nucleating agent during the crystallization process. It also slowed down the decrease in mechanical properties. The mechanical properties were shown to gradually decrease for the PHBV/TiO2 nanocomposites, whereas a sharp drop was observed for the neat PHBV after an accelerated weathering exposure. Atomic force microscopy (AFM), using the amplitude modulation–frequency modulation (AM–FM) tool, also confirmed the mechanical changes in the surface area of the PHBV and PHBV/TiO2 samples after accelerated weathering exposure. The changes in the physical and chemical properties of PHBV/TiO2 confirm the barrier activity of TiO2 for weathering attack and its retardation of the degradation process.

show abstract

“…The rigidity of macromolecular chains slows down the migration of moisture and microbial agents into the material, decreasing its degradation rate [68,69]. Using plasticizers or blending PLA with polymers that are more flexible can decrease the glass transition, favoring biodegradation [70,71]. A crystallinity increase was observed in chitosan loaded PLA films exposed to white root fungus, which mainly attack the amorphous regions, having higher flexibility of macromolecular chains [72].…”

Section: Biodegradability Of Polymer Composites With Natural Fillersmentioning

confidence: 99%

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Brebu¹

2020

Polymers

152

View full text Add to dashboard Cite

Polymer composites are widely used modern-day materials, specially designed to combine good mechanical properties and low density, resulting in a high tensile strength-to-weight ratio. However, materials for outdoor use suffer from the negative effects of environmental factors, loosing properties in various degrees. In particular, natural fillers (particulates or fibers) or components induce biodegradability in the otherwise bio inert matrix of usual commodity plastics. Here we present some aspects found in recent literature related to the effect of aggressive factors such as temperature, mechanical forces, solar radiation, humidity, and biological attack on the properties of plastic composites containing natural fillers.

show abstract

Complex study of the physical properties of a poly(lactic acid)/poly(3-hydroxybutyrate) blend and its carbon black composite during various outdoor and laboratory ageing conditions

Abstract: Carbon black improved retention of mechanical properties of compostable PLA/PHB – based foil during ageing making it suitable as mulching material.

Cited by 22 publications

References 49 publications

Preparation and characterization of antistatic packaging for electronic components based on poly(lactic acid)/carbon black composites

Preparation and characterization of antistatic packaging for electronic components based on poly(lactic acid)/carbon black composites

Accelerated Weathering Effects on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV/TiO2 Nanocomposites

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Contact Info

Product

Resources

About