Effect of ultraviolet and moisture action on biodegradable polymers and their blend

Mistretta, Maria Chiara; Mantia, Francesco Paolo La; Titone, Vincenzo; Botta, Luigi; Pedeferri, MariaPia; Morreale, Margherita

doi:10.1177/2280800020926653

Cited by 13 publications

(19 citation statements)

References 19 publications

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“…The reason for the drastic reduction of light transmission in the samples with 0% and 2% by weight of CaCO 3 can be attributed to the rapid yellowing of the matrix. [ 29 ] Indeed, when the sample changes from transparent to yellow, the polymer absorbs more visible light in the blue range, reducing the total light transmitted through the sample. In the case of 5%, the highest transmittance values are due to a minimization of yellowing.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Calcium Carbonate on the Photo‐Oxidative Behavior of Poly(butylene adipate‐co‐terephthalate)

Titone

Mantia

Mistretta

2020

Macro Materials & Eng

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The aim of this work is to evaluate the influence of nanosized CaCO3 on the photo‐oxidation of poly(butylene adipate‐co‐terephthalate) (PBAT)‐based nanocomposites. The PBAT/CaCO3 nanocomposites are prepared by using a corotating twin‐screw extruder with 0, 2, and 5 wt% of CaCO3. The films are obtained by film blowing process. Specimens of the nanocomposites and that of the pure polymer are subjected to accelerated aging with a cycle of 8 h of light at a temperature of 55 °C followed by 4 h condensation at 45 °C to evaluate the effects of the CaCO3 addition on the photo‐oxidation of PBAT. The results indicate that the modulus and tensile strength of the nanocomposites are increased significantly after incorporation of nanosized CaCO3, but, however, the elongation at break remains almost unchanged. The presence of the calcium carbonate slightly increases the photo‐oxidation rate of the matrix due to the presence of a stearate coating.

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Section: Resultsmentioning

confidence: 99%

The Effect of Calcium Carbonate on the Photo‐Oxidative Behavior of Poly(butylene adipate‐co‐terephthalate)

Titone

Mantia

Mistretta

2020

Macro Materials & Eng

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“…The increase of the viscosity must be, then, correlated with an increase of the molecular weight or with a formation of some cross-links or some branching during the reprocessing. PBAT is, indeed, prone to form crosslinks during degradation [ 19 , 20 , 21 , 33 ], and the branching is the first step in forming cross-linked structures. No cross-links were revealed for the PLA.…”

Section: Resultsmentioning

confidence: 99%

“…In a previous work [ 33 ], it was demonstrated that photoxidation of PBAT can lead to different levels of cross-linking, depending on the environmental conditions. In particular, when photooxidation was carried out with a condensation cycle, cross-linking was lower than that measured when photooxidation was carried out without a condensation cycle.…”

Section: Resultsmentioning

confidence: 99%

Recycling of a Biodegradable Polymer Blend

et al. 2020

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Mechanical recycling is one of the possible ways to enhance the value of postconsumer plastic materials. However, the final performance of the recycled material will strongly depend on the quality of the selection made on the recycled product and on the degradation of the properties. In this context, the present study examines the effect of reprocessing for five successive extrusion cycles on the rheological, mechanical and thermal properties of a poly(butylene adipate-co-terephthalate) (PBAT)-based blend on samples reprocessed in both dry and wet conditions. The results showed that when the sample was processed after drying, degradation of the material was less than when it was processed in wet conditions. However, the experimental results showed that the decrease of rheological and mechanical properties was not so dramatic, and therefore the material could be reused in both cases.

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“…The degradation phenomena are mainly due to the hydrolysis of the macromolecular chains with a severe decrease of molecular weight [ 9 , 10 , 11 ]. In addition, the presence of moisture strongly modifies the mechanical properties [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [ 13 ], we demonstrated how the presence of moisture significantly affects the mechanical properties of biodegradable polyesters subjected to UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture Content on the Processing and Mechanical Properties of a Biodegradable Polyester

Titone

Correnti²,

Mantia

2021

Polymers

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This work is focused on the influence of moisture content on the processing and mechanical properties of a biodegradable polyester used for applications in injection molding. The pellets of the biodegradable polyester were exposed under different relative humidity conditions at a constant temperature before being compression molded. The compression-molded specimens were again placed under the above conditions before the mechanical testing. With all these samples, it is possible to determine the effect of moisture content on the processing and mechanical properties separately, as well as the combined effect of moisture content on the mechanical properties. The results obtained showed that the amount of absorbed water—both before processing and before mechanical testing—causes an increase in elongation at break and a slight reduction of the elastic modulus and tensile strength. These changes have been associated with possible hydrolytic degradation during the compression molding process and, in particular, with the plasticizing action of the moisture absorbed by the specimens.

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Effect of ultraviolet and moisture action on biodegradable polymers and their blend

Cited by 13 publications

References 19 publications

The Effect of Calcium Carbonate on the Photo‐Oxidative Behavior of Poly(butylene adipate‐co‐terephthalate)

The Effect of Calcium Carbonate on the Photo‐Oxidative Behavior of Poly(butylene adipate‐co‐terephthalate)

Recycling of a Biodegradable Polymer Blend

Effect of Moisture Content on the Processing and Mechanical Properties of a Biodegradable Polyester

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