Degradation of PLA/ZnO and PHBV/ZnO composites prepared by melt processing

Anžlovar, Alojz; Kržan, Andrej; Žagar, Ema

doi:10.1016/j.arabjc.2017.07.001

Cited by 68 publications

(54 citation statements)

References 49 publications

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“…% of n‐ZnO (Figure 6B) reflect concentrations closer to the established values, being 1.4% and 3.4%, respectively. It is important to note that although the PHB has a thermal stability lower than that of PDLLA, n‐ZnO did not show a pronounced effect on the degradation temperature of the material, which agrees with that reported by Anz Lovar et al 43 who carried out a study of the thermal degradation of PLA‐ZnO and PHVB‐ZnO, and showed that the metal oxide of interest degrades PLA to a greater extent. The T d of the materials formulated at 0, 1 and 3 wt.…”

Section: Resultssupporting

confidence: 89%

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Processing‐structure‐property relationships of biopolyester/zinc oxide fibrous scaffolds engineered by centrifugal spinning

Padilla

Rodríguez-Tobías

Morales

et al. 2020

Polymers for Advanced Techs

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This study addresses the processing of nonwoven fibrous materials obtained by centrifugal spinning method, namely Forcespinning; a high yield and low production cost technique little explored in this field. Poly(D, L‐lactic acid) (PDLLA) and poly(3‐hydroxybutyrate) (PHB) were used as matrices and reinforced with zinc oxide nanoparticles (n‐ZnO). The morphology, mechanical, and thermal performance of the developed composites were analyzed as well as the antibacterial effect of n‐ZnO. Fibrous materials with n‐ZnO concentrations of 1, 3, and 5 wt. % for PDLLA and 1 and 3 wt. % for PHB were evaluated. The results showed that the incorporation of n‐ZnO produces an increase in the viscosity of the precursor solutions for both polymeric systems, which caused an increase in the average fiber diameter, though the morphology was not affected, obtaining mostly long, continuous, and homogenous fibers. In addition, a decrease in thermal stability was observed to a greater extent in PDLLA systems. Regarding the mechanical performance, optimal properties were obtained at a concentration of 3 and 1 wt. % of n‐ZnO for PDLLA and PHB, respectively. Antibacterial studies showed that PHB with 1 and 3 wt. % of n‐ZnO effectively combat strains of E. coli and S. aureus, presenting 100% of strain growth inhibition. In the case of PDLLA, a higher n‐ZnO concentration (5 wt. %) was required to reach a strain growth inhibition above 97%. Finally, cell viability tests demonstrated that the designed fibrous mats support cell proliferation, indicating their potential for use as scaffolds in bone tissue regeneration.

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Section: Resultssupporting

confidence: 89%

“…%. Different publications attribute this behavior to the fact that ZnO promotes reactions of transesterification and depolymerization of PLA 42‐45 . At 3 and 5 wt.…”

Section: Resultsmentioning

confidence: 96%

Processing‐structure‐property relationships of biopolyester/zinc oxide fibrous scaffolds engineered by centrifugal spinning

Padilla

Rodríguez-Tobías

Morales

et al. 2020

Polymers for Advanced Techs

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show abstract

“…Table 3 and Figure 3 display the result of the thermal characterization of the sample containing TiO 2 nanoparticles. The TGA result shows that the degradation temperature of the composite nanofiber (peak around 355 • C against the peak at 326.6 • C of the pure PLA) is significantly affected by the presence of TiO 2 but not by its concentrations in the polymer matrix (Laske et al, 2015;Wacharawichanant et al, 2017;AnŽlovar et al, 2018). It is clear from Table 3 that the residual weight expressed in mg/mg is proportional to the TiO 2 content on the PLA electrospun nanofibers.…”

Section: Samplementioning

confidence: 95%

Electrospun Nanofibrous Poly (Lactic Acid)/Titanium Dioxide Nanocomposite Membranes for Cutaneous Scar Minimization

Marsi

Ricci

Toniato

et al. 2019

Front. Bioeng. Biotechnol.

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Poly (lactic acid) (PLA) has been increasingly used in cutaneous tissue engineering due to its low cost, ease of handling, biodegradability, and biocompatibility, as well as its ability to form composites. However, these polymers possess a structure with nanoporous that mimic the cellular environment. In this study, nanocomposites are prepared using PLA and titanium dioxide (TiO 2) (10 and 35%-w/w) nanoparticles that also function as an active anti-scarring agent. The nanocomposites were prepared using an electrospinning technique. Three different solutions were prepared as follows: PLA, 10% PLA/TiO 2 , and 35% PLA/TiO 2 (w/w%). Electrospun PLA and PLA/TiO 2 nanocomposites were characterized morphologically, structurally, and chemically using electron scanning microscopy, transmission electron microscopy, goniometry, and X-ray diffraction. L929 fibroblast cells were used for in vitro tests. The cytotoxic effect was evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays. Versicam (VCAN), biglicam (BIG), interleukin-6 (IL6), interleukin-10 (IL-10), and type-1 collagen (COL1A1) genes were evaluated by RT-qPCR. In vivo tests using Wistar rats were conducted for up to 15 days. Nanofibrous fibers were obtained for all groups that did not contain residual solvents. No cytotoxic effects were observed for up to 168 h. The genes expressed showed the highest values of versican and collagen-1 (p < 0.05) for PLA/TiO 2 nanocomposite scaffolds when compared to the control group (cells). Histological images showed that PLA at 10 and 35% w/w led to a discrete inflammatory infiltration and expression of many newly formed vessels, indicating increased metabolic activity of this tissue. To summarize, this study supported the potential of PLA/TiO 2 nanocomposites ability to reduce cutaneous scarring in scaffolds.

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“…Some works have reported on the use of surface treatments such as silanization to protect the polymer during melt processing. Pantani et al [26] and Murariu et al [28] did not observe a shift to T g in PLA/ZnO nanorods composites produced by melt compounding using surface compatibilisation, while Anzlovar et al [27] reported that the average molar mass of PLA in PLA/ZnO nanocomposites obtained by melt extrusion was almost halved. They observed a T g increase of 36°C upon inclusion of 1% ZnO nanoparticles by injection moulding, which was a much larger shift than that observed in the present work.…”

Section: Glass Transition and Physical Aging Of Pla Pla/zno_r And Plmentioning

confidence: 97%

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

et al. 2019

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In this work we study the effect of zinc oxide (ZnO) nanoparticle morphology and concentration on the resulting relaxation and transport properties of polylactide (PLA) nanocomposites. Films containing spherical and rodshaped ZnO nanoparticles were incorporated into an amorphous polylactide (PLA) matrix through a solventprecipitation and compression moulding method. Morphological analyses carried out by scanning electron microscopy (SEM) together with ultraviolet-visible (UV-Vis) spectroscopy and thermogravimetric analysis (TGA). Results indicate a much better distribution of rod-shaped ZnO within PLA matrix. Relaxation experiments reveal faster physical aging kinetics of PLA in presence ZnO nanoparticles notwithstanding their shape, suggesting the presence of non-interacting surfaces between the amorphous PLA matrix and the ZnO nanoparticles. Interestingly, both helium and oxygen permeability remained stable or increase upon nanoparticle addition, and anisole sorption kinetics showed faster mass transport in the nanocomposites, suggesting that the low interfacial adhesion between PLA and ZnO brings supplementary voids to the material increasing mass transport. Overall, the experimental findings here reported provide a deeper understanding on the influence of metal oxide nanoparticle morphology on the resulting relaxation and gas transport properties of amorphous polymeric nanocomposites.

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Degradation of PLA/ZnO and PHBV/ZnO composites prepared by melt processing

Cited by 68 publications

References 49 publications

Processing‐structure‐property relationships of biopolyester/zinc oxide fibrous scaffolds engineered by centrifugal spinning

Processing‐structure‐property relationships of biopolyester/zinc oxide fibrous scaffolds engineered by centrifugal spinning

Electrospun Nanofibrous Poly (Lactic Acid)/Titanium Dioxide Nanocomposite Membranes for Cutaneous Scar Minimization

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

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