Optimizing crystallinity of engineered poly(lactic acid)/poly(butylene succinate) blends: The role of single and multiple nucleating agents

Barletta, Massimiliano; Pizzi, Elisa

doi:10.1002/app.50236

Cited by 6 publications

(2 citation statements)

References 99 publications

(136 reference statements)

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“…In particular, an increase in the signal at about 1210 cm −1 compared to a decrease in the signal at 1180 cm −1 is widely reported in the scientific literature, as a typical signal correlated to the transition from PLA samples that are mainly amorphous to PLA samples with increased crystalline content. In fact, these two signals were assigned to the coupling of the stretching of the ester bond with the rocking of the neighboring CH 3 or CH (mode A parallel to the helix for the band at 1180 cm −1 and mode E1 perpendicular to the axis of the helix for the band at 1210 cm −1 ) 36 . On the other hand, the variation of the relative intensities would result from further coupling with the skeletal modes, according to group factor splitting mechanisms, and therefore correlated to the presence and content of the α crystals in PLA as reported in Tsuji and Ikada 37 …”

Section: Resultsmentioning

confidence: 99%

Corotating twin‐screw extrusion of poly(lactic acid)PLA/poly(butylene succinate)PBS/ micro‐lamellar talc blends for extrusion blow molding of biobased bottles for alcoholic beverages

Aversa

Barletta

Gisario

et al. 2021

J of Applied Polymer Sci

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Extrusion blow molding is a well‐established technology for the manufacture of fossil‐based plastic bottles. The process is, however, still little used for the manufacture of bottles with a low environmental footprint, especially those based on bioplastic from renewable sources. In this context, the objective of this work is precisely the study and experimental design of poly(lactic acid) PLA/poly(butylene succinate) PBS/micro‐lamellar talc compounds for the manufacturing of bioplastic bottles, basically for wine packaging. In particular, the design was carried out to ensure, primarily, an adequate processability of the bioplastic material in the blowing process. Second, the compound was loaded with different micro‐lamellar talc content so as to achieve protection from the environmental factors, which is of paramount importance to ensure a long shelf‐life to wine. The bio‐derived polyester resins are very complex to transform, as they are subject to thermo‐hydrolytic degradation phenomena during the processing of the polymer melt. Processability is further limited in the presence of high micro‐lamellar talc content that increases the melt viscosity, thus making the material even more difficult to shape by extrusion blow molding. The experimental analysis involved the use of a co‐rotating twin‐screw extruder for the manufacture of the bioplastic compounds. The compounds were first subjected to thermo‐rheological and physical characterization tests. Second, it was tested in the extrusion blow molding process. The experimental results have shown that blends based on bio‐derived polyester resins can be adequately processed by extrusion blow molding, showing extremely stable rheological behavior both during the extrusion phase of the parison and the subsequent blowing process of the parison itself. These blends have, therefore, an interesting potential to be used as an alternative with a low environmental footprint to oil‐based plastics in the production of wine bottles.

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Section: Resultsmentioning

confidence: 99%

Corotating twin‐screw extrusion of poly(lactic acid)PLA/poly(butylene succinate)PBS/ micro‐lamellar talc blends for extrusion blow molding of biobased bottles for alcoholic beverages

Aversa

Barletta

Gisario

et al. 2021

J of Applied Polymer Sci

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“…For the exothermic melting point analysis, two points on both sides of the broad melting peak ( T m ) were selected on the baseline to analyze the heat flow integral area difference (J/g) between them. The calculation formula for crystallinity is shown below 18

Crystallinity (() %) goodbreak= 100 goodbreak\times ((), normalΔ H_{exo} goodbreak- normalΔ H_{endo}) / normalΔ {H_{m}}^{\infty},

where Δ H m ∞ is the melting enthalpy of 100% each crystalline material in the references in which the values are 93 J/g for PLLA and 140 J/g for PCL 19,20 .…”

Section: Methodsmentioning

confidence: 99%

Development of three‐dimensionally printed vascular stents of bioresorbable poly(l‐lactide‐co‐caprolactone)

Zhao

Song²,

Zhao³

et al. 2022

J Biomed Mater Res

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With the ripening of 3D printing technology and the discovery of a variety of printable materials, 3D-printed vascular stents provide new treatment options for patients with angiocardiopathy. Bioresorbable stent not only combines the advantages of metallic stent and drug-coated balloon, but also avoids the disadvantages of them.3D printing is also an economical and efficient way to produce stents and makes it possible to construct complex structures. In this study, stents made from poly(L-lactic acid) (PLLA), poly(ε-caprolactone) (PCL) and poly(L-lactide-co-caprolactone) (PLCL) were manufactured by 3D printing and evaluated for radial strength, crystallinity and molecular weight. PLCL copolymerized by different proportions of lactic acid and caprolactone showed different mechanical and degradation properties. This demonstrated the potential of 3D printing as a low-cost and high throughput method for stent manufacturing. The PLLA and PLCL 95/5 stents had similar mechanical properties, whereas PLCL 85/15 and PCL stents both had relatively low radial strength. In general, PLCL 95/5 had a faster degradation rate than PLLA. These two materials were made into peripheral vascular bioresorbable scaffolds (BRS) and further studied by additional bench testing. PLCL 95/5 peripheral BRS had superior mechanical properties in terms of flexural/bending fatigue and compression resistance.

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Injection‐stretch blow molding of poly (lactic acid)/polybutylene succinate blends for the manufacturing of bottles

Aversa

Barletta

Gisario

et al. 2021

J of Applied Polymer Sci

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The stretch blow molding process of plastic preforms is widely used for the manufacturing of bottles in numerous market sectors, with high production volumes and low unit costs. In the sector of alcoholic beverages and, in particular, of wine, plastic bottles are used sporadically. Glass bottles or other economic solutions such as laminated cardboard containers or so-called bagin-boxes are regularly preferred. However, the high ease of use, lightness, recyclability and low cost of plastic materials are the main reasons that are fueling interest especially in wine producers. Poly (ethylene terephthalate) bottles have recently been introduced to the market, although their success has been limited by poor gas impermeability and above all by their recognized high environmental footprint. Barrier can be improved by oxygen scavenger and plasma coating. Environmental footprint is rather low when recycled but that is not well possible with scavenger. Bioplastic materials offer an interesting alternative to fossil-based plastics, combining most of their technical advantages with a lower environmental impact. However, they are more expensive and complex to process. In addition, mechanical and barrier properties are often less than for conventional polymers. In this work, therefore, the development of bioplastic bottles with low gas permeation by stretch blow molding was studied. Poly (lactic acid)-polybutylene succinate blends have been modified by adding additives that obstruct the passage of gaseous molecules through the wall of the bottle. The studies have in particular concerned the extrusion and characterization of bioplastic compounds, the injection molding of preforms, and the blowing of bottles. The results obtained showed that it is possible to obtain low permeation bioplastic bottles, which are an ecological alternative to conventional solutions for packaging.

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Optimizing crystallinity of engineered poly(lactic acid)/poly(butylene succinate) blends: The role of single and multiple nucleating agents

Cited by 6 publications

References 99 publications

Corotating twin‐screw extrusion of poly(lactic acid)PLA/poly(butylene succinate)PBS/ micro‐lamellar talc blends for extrusion blow molding of biobased bottles for alcoholic beverages

Corotating twin‐screw extrusion of poly(lactic acid)PLA/poly(butylene succinate)PBS/ micro‐lamellar talc blends for extrusion blow molding of biobased bottles for alcoholic beverages

Development of three‐dimensionally printed vascular stents of bioresorbable poly(l‐lactide‐co‐caprolactone)

Injection‐stretch blow molding of poly (lactic acid)/polybutylene succinate blends for the manufacturing of bottles

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