Cooperativity Scaling and Free Volume in Plasticized Polylactide

Araujo, Steven; Delpouve, Nicolas; Domenek, Sandra; Guinault, Alain; Golovchak, R.; Szatanik, R.; Ingram, Adam; Fauchard, Cyrille; Delbreilh, Laurent; Dargent, Éric

doi:10.1021/acs.macromol.9b00464

Cited by 20 publications

(29 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was observed [24,25] by modulated temperature differential scanning calorimetry (MTÀ DSC) and dielectric relaxation spectroscopy (DRS) that the ATBC molecules decrease the kinetic fragility index, and that this result coincides with the decrease of the size of CRR [25]. Recently [26], we have shown that the variations of the CRR size in plasticized PLA are consistent with the variations of the free volume obtained experimentally from positron annihilation lifetime spectroscopy (PALS).…”

Section: Introductionsupporting

confidence: 82%

“…Fig. 6 shows PALS results as a function of temperature that have been obtained during glass transition and cold crystallization of initially amorphous PLAs [26]. In the glassy state, f v is nearly constant and increases from 1.6 for neat PLA to 1.8% for PLA_10.…”

Section: Free Volume and Glass Transition Cooperative Dynamicsmentioning

confidence: 99%

“…TemperatureÀ dependent PALS was performed to provide the information regarding the content of free volume available in the material [26]. The instrument was calibrated by measuring Co60 isotope, pure Ni and Au metals, as well as PTFE (Teflon) standards.…”

Section: Positron Annihilation Lifetime Spectroscopymentioning

confidence: 99%

“…The intrinsic effect of plasticization on the MTÀ DSC response of amorphous PLA was investigated in previous works [21,[23][24][25][26] and is briefly summarized in Supporting Information (Fig. S3).…”

Section: Impact Of the Annealing On The Amorphous Fractions Charactermentioning

confidence: 99%

“…Plasticization of PLA can be explained by several theories based on physical observations [22]. In previous works on fully amorphous PLAs [21,[23][24][25][26], we investigated the influence of ATBC on the glass transition dynamics by thermal analysis techniques. Polymer glassÀ formers usually exhibit a deviation from the ArrheniusÀ type temperature dependence of relaxation time, when approaching glass transition on cooling, this deviation being described by fragility index [27].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide

Varol

Delpouve

Araujo

et al. 2020

Polymer

View full text Add to dashboard Cite

Plasticization of amorphous polylactide shifts the glass transition and extends its temperature range of crystallization to lower temperatures. In this work, we focus on how lowÀ temperature crystallization impacts the mobility of the amorphous phase. Plasticizer accumulates in the amorphous phase because it is excluded from the growing crystal. The formation of rigid amorphous fraction is favored by the low crystallization temperature. It reaches values up to 50% in plasticized polylactide. The increase in the content of rigid amorphous fraction coincides with both the increase of free volume quantified by positron annihilation lifetime spectroscopy, and the decrease in the cooperativity length obtained from the temperature fluctuation approach. The drop of cooperativity is interpreted in terms of mobility gradient due to the amorphous rigidification.

show abstract

Section: Introductionsupporting

confidence: 82%

Section: Free Volume and Glass Transition Cooperative Dynamicsmentioning

confidence: 99%

Section: Positron Annihilation Lifetime Spectroscopymentioning

confidence: 99%

Section: Impact Of the Annealing On The Amorphous Fractions Charactermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide

Varol

Delpouve

Araujo

et al. 2020

Polymer

View full text Add to dashboard Cite

show abstract

Development of extrusion blown films of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) blends for flexible packaging

Le Delliou,

Vitrac,

Benihya

et al. 2024

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) is a biodegradable polymer with significant potential for use in food packaging. However, its limited melt strength poses a challenge when employing film‐blowing techniques to produce flexible packaging. To overcome this obstacle, we developed blends consisting of 70 wt% PHBV and 30 wt% poly(butylene‐co‐succinate‐co‐adipate) (PBSA). Organic peroxides such as dicumyl peroxide and 2,5‐dimethyl‐2,5‐di‐(tert‐butylperoxy)hexane, were utilized as reactive compatibilizers to enhance the interfacial adhesion between the polymers. Additionally, acetyl tributyl citrate (ATBC) was employed as a plasticizer to improve processability and ductility. The inclusion of organic peroxides resulted in the formation of long‐branched structures, as confirmed by the van‐Gurp‐Palmen plot. The melt flow index decreased from 30 to 9.8 g/10 min without ATBC and 15.5 g/10 min with ATBC. Successful production of blown PHBV/PBSA films was achieved on a pilot scale (bubble height 180 cm). These films exhibited heat‐sealing capability and increased impact strength (7.7 kJ/m2). Moreover, the films maintained a maximum elongation at break of 4% during a 3‐month storage experiment with frozen food. Food safety was assessed through overall migration experiments, and the non‐plasticized films received approval. In conclusion, the compatibilized PHBV/PBSA blends demonstrate great potential as materials for manufacturing film‐blown flexible packaging.

show abstract

An overview of sensors and sensing materials for heavy metals in aqueous environments

et al. 2021

View full text Add to dashboard Cite

This paper offers a critical overview of recent advancements in aqueous sensors for heavy metals. The paper focuses on the challenges and advantages of using microelectromechanical systems (MEMS) sensors in aqueous environments, as well as technical considerations for choosing appropriate polymeric sensing materials. In addition, general considerations and recommendations are included for developing MEMS chemical sensors. These considerations centre around the chemical nature of the target analyte and the environment of the sensor application. By following these recommendations and taking the time to design a suitable sensor and sensing material for the target application instead of a trial‐and‐error approach, it is possible to save both time and cost.

show abstract

Cooperativity Scaling and Free Volume in Plasticized Polylactide

Cited by 20 publications

References 68 publications

Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide

Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide

Development of extrusion blown films of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) blends for flexible packaging

An overview of sensors and sensing materials for heavy metals in aqueous environments

Contact Info

Product

Resources

About