Biodegradable aliphatic copolyesters containing PEG-like sequences for sustainable food packaging applications

Gigli, Matteo; Lotti, Nadia; Gazzano, Massimo; Siracusa, Valentina; Finelli, Lara; Munari, Andrea; Rosa, Marco Dalla

doi:10.1016/j.polymdegradstab.2014.04.006

Cited by 44 publications

(35 citation statements)

References 34 publications

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“…To overcome this drawback, various approaches have been explored in the last few years. New flexible copolyesters have been investigated as toughened alternatives to brittle PLA formulations . In these works, the results showed increased elongation at break values and a marked improvement in ductile properties.…”

Section: Introductionmentioning

confidence: 99%

The effect of maleinized linseed oil as biobased plasticizer in poly(lactic acid)‐based formulations

Ferri

Garcia‐Garcia

Muñoz

et al. 2017

Polymer International

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Section: Introductionmentioning

confidence: 99%

The effect of maleinized linseed oil as biobased plasticizer in poly(lactic acid)‐based formulations

Ferri

Garcia‐Garcia

Muñoz

et al. 2017

Polymer International

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“…By using copolymerization processes with appropriately selected monomers it is possible to tailor PLA properties to desired performance. Some examples of PLA‐based copolymers are PLACL, poly[(lactic acid)‐ co ‐(ethylene glycol)], PHBV, etc . Nevertheless these copolymers are expensive.…”

Section: Introductionmentioning

confidence: 99%

Effect of miscibility on mechanical and thermal properties of poly(lactic acid)/ polycaprolactone blends

et al. 2016

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In this work, binary blends based on poly(lactic acid)-PLA and poly(caprolactone)-PCL were prepared by melt mixing in a twin screw co-rotating extruder in order to increase the low intrinsic elongation at break of PLA for packaging applications. Although PLA and PCL show low miscibility, presence of PCL leads to a remarkable increase in ductile properties of PLA.Different mechanical properties were evaluated in terms of PCL content up to 30 weight % PCL. Additionally to tensile and flexural properties, the Poisson's ratio was obtained by using bi-axial extensometry to evaluate transversal deformations when axial loads are applied. Very slight changes in the melt temperature (T m ) and glass transition temperature (T g ) of PLA were observed thus indicating low miscibility of the PLA-PCL system. Field emission scanning electron microscopy (FESEM) revealed some interactions between the two components of the blend since the morphology is characterized by non-spherical poly(caprolactone) drops dispersed into the PLA matrix. In addition to the improvement of mechanical ductile properties, PCL provides higher degradation rates of blends under conditions of composting for contents below 22.5% PCL.Keywords: Poly(lactic acid)-PLA; poly(caprolactone)-PCL; binary blends; FESEM; mechanical properties; disintegrability. 1.-Introduction.Nowadays, polymers find a broad number of applications in the fields of packaging, medical and automotive industries due to an excellent balance between processing and overall properties [1]. Among all these polymers, aliphatic polyesters from both renewable and/or fossil fuel resources [2] Poly(lactic acid) is one of the most used biocompostable polymers in packaging applications due to its high mechanical performance and balanced barrier properties [16,17].PLA is widely used in the manufacturing of biodegradable/biocompostable films for food applications. The main drawback related to PLA is its high intrinsic fragility that is still accentuated as degradation occurs. PLA has low ductility at room temperature because its glass transition temperature (T g ) is located at around 60 ºC; so that, below its T g , it behaves as a glass characterized by high mechanical resistance and modulus and high fragility together with low elongation at break (due to restricted polymer chain mobility below T g ). Conventional plasticizers could potentially be used to allow some elongation at break but typical plasticizers can migrate and this could be responsible for a toxicity as well as a decrease in mechanical properties [18][19][20]. Another alternative is copolymerization. By using copolymerization processes with appropriately selected monomers it is possible to tailor PLA properties to desired performance. Some examples of PLA-based copolymers are poly(lactic acid-co--caprolactone)-PLACL, poly(lactic acid-co-ethylene glycol)-PLAEG, poly(hydroxibutirate-cohydroxivalerate)-PHBV, etc [21,22]. Nevertheless these copolymers are expensive. One attracting solution is manufacturing of binary or ternary...

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“…Therefore, polymers derived, for example, from 1,4-cyclohexane dicarboxylic acid and a diol obtainable from biomass (as 1,3-propanediol, obtainable by renewable feedstocks, such as corn) can be considered as fully sustainable materials. Moreover, the presence of the 1,4-cyclohexylene units along a macromolecule does not hinder the attack of microorganisms in some homopolymers and copolymers [7][8][9]. Therefore, the polyesters containing the 1,4-cyclohexylene units can be considered biodegradable materials and are very promising, environmentally friendly polyesters.…”

Section: Introductionmentioning

confidence: 99%

New eco-friendly random copolyesters based on poly(propylene cyclohexanedicarboxylate): Structure-properties relationships

Genovese¹,

Lotti

Gazzano³

et al. 2015

Express Polym. Lett.

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Abstract.A series of novel random copolymers of poly(propylene 1,4-cyclohexanedicarboxylate) (PPCE) containing neopentyl glycol sub-unit (P(PCExNCEy)) were synthesized and characterized in terms of molecular and solid-state properties. In addition, biodegradability studies in compost have been conducted. The copolymers displayed a high and similar thermal stability with respect to PPCE. At room temperature, all the copolymers appeared as semicrystalline materials: the main effect of copolymerization was a lowering of crystallinity degree (! c ) and a decrease of the melting temperature compared to the parent homopolymer. In particular, Wide Angle X-Ray diffraction (WAXD) measurements indicated that P(PCExNCEy) copolymers are characterized by cocrystallization, PNCE counits cocrystallizing in PPCE crystalline phase. Final properties and biodegradation rate of the materials under study were strictly dependent on copolymer composition and ! c . As a matter of fact, the elastic modulus and the elongation at break decreased and increased, respectively, as neopentyl glycol cyclohexanedicarboxylate (NCE) unit content was increased. The presence of a rigid-amorphous phase was evidenced by means of Dynamic Mechanical Thermal Analysis (DMTA) analysis in all the samples under investigation. Lastly, the biodegradation rate of P(PCExNCEy) copolymers was found to slightly increase with the increasing of NCE molar content.

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Biodegradable aliphatic copolyesters containing PEG-like sequences for sustainable food packaging applications

Cited by 44 publications

References 34 publications

The effect of maleinized linseed oil as biobased plasticizer in poly(lactic acid)‐based formulations

The effect of maleinized linseed oil as biobased plasticizer in poly(lactic acid)‐based formulations

Effect of miscibility on mechanical and thermal properties of poly(lactic acid)/ polycaprolactone blends

New eco-friendly random copolyesters based on poly(propylene cyclohexanedicarboxylate): Structure-properties relationships

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