Estimation of Surface Free Energy of Poly(lactic acid) During UV‐Grafting with N‐Vinylpyrrolidone

Gutiérrez-Villarreal, Mario H.; Rodríguez-González, Francisco; Perera-Mercado, Yibran

doi:10.1002/masy.201600130

Cited by 11 publications

(7 citation statements)

References 15 publications

(15 reference statements)

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“…However, these results remained consistent with the findings from XPS and FTIR that showed the formation of new oxygen-bearing functional groups. The presented contact angles for both the pristine and plasma-treated PLA-T and PLA-MC corresponded to those reported in the literature [36][37][38], as did the observed increase in SFE from 47.9 and 45.8 mJ/m 2 , respectively, to 61.0 and 61.2 mJ/m 2 [30,39]. It must be also noticed that changes induced by plasma are prone to disappear with time [26,37].…”

Section: Contact Angle and Surface Free Energy (Sfe)supporting

confidence: 86%

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

et al. 2021

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Poly(lactide) (PLA) films obtained by thermoforming or solution-casting were modified by diffuse coplanar surface barrier discharge plasma (300 W and 60 s). PLA films were used as hot-melt adhesive in joints in oak wood. It was demonstrated that lap shear strength increased from 3.4 to 8.2 MPa, respectively, for the untreated and plasma-treated series. Pull-off tests performed on particleboard for the untreated and treated PLA films showed 100% cohesive failure. Pull-off strength tests on solid oak demonstrated adhesion enhancement from 3.3 MPa with the adhesion failure mode to 6.6 MPa with the cohesion failure mode for untreated and treated PLA. XPS revealed that carbonyl oxygen content increased by two-to-three-fold, which was confirmed in the Fourier-transform infrared spectroscopy experiments of the treated PLA. The water contact angle decreased from 66.4° for the pristine PLA to 49.8° after treatment. Subsequently, the surface free energy increased from 47.9 to 61.05 mJ/m2. Thus, it was clearly proven that discharge air plasma can be an efficient tool to change surface properties and to strengthen adhesive interactions between PLA and woody substrates.

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Section: Contact Angle and Surface Free Energy (Sfe)supporting

confidence: 86%

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

et al. 2021

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“…Moreover, the increase of Sq could slightly increase the water contact angle of the PLA composite films. The Fowkes model ( Section S1.2, Supporting Information ) was used to calculate the surface free energy, and the results are shown in Figure 4 h [ 37 , 38 ]. The higher surface free energy indicated that the surface could be wetted easily (a small value of contact angle), which was in good agreement with the change of water contact angle.…”

Section: Resultsmentioning

confidence: 99%

Impact of the Incorporation of Nano-Sized Cellulose Formate on the End Quality of Polylactic Acid Composite Film

Zhang

Liu

et al. 2021

Nanomaterials

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Polylactic acid (PLA) films with good sustainable and biodegradable properties have been increasingly explored recently, while the poor mechanical property of PLA limits its further application. Herein, three kinds of nano-sized cellulose formate (NCF: cellulose nanofibril (CNF), cellulose nanocrystal (CNC), and regenerated cellulose formate (CF)) with different properties were fabricated via a one-step formic acid (FA) hydrolysis of tobacco stalk, and the influence of the properties of NCF with different morphologies, crystallinity index (CrI), and degree of substitution (DS) on the end quality of PLA composite film was systematically compared. Results showed that the PLA/CNC film showed the highest increase (106%) of tensile strength compared to the CNF- and CF-based films, which was induced by the rod-like CNC with higher CrI. PLA/CF film showed the largest increase (50%) of elongation at the break and more even surface, which was due to the stronger interfacial interaction between PLA and the CF with higher DS. Moreover, the degradation property of PLA/CNF film was better than that of other composite films. This fundamental study was very beneficial for the development of high-quality, sustainable packaging as an alternative to petroleum-based products.

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“…These parameters could be determined from contact angle (θ) measurements [ 23 ]. Moreover, the water contact angle (θ w ) allows prediction of the hydration properties of materials [ 24 ], which is an important issue during active compound release.…”

Section: Resultsmentioning

confidence: 99%

Development and Evaluation of the Properties of Active Films for High-Fat Fruit and Vegetable Packaging

et al. 2023

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β-cyclodextrin and allyl isothiocyanate inclusion complexes (β-CD:AITC) have been proposed for developing fresh fruit and vegetable packaging materials. Therefore, the aim of this research was to develop active materials based on poly(lactic acid) (PLA) loaded with β-CD:AITC and to assess changes in the material properties during the release of AITC to food simulants. PLA films with 0, 5 and 10 wt.% β-CD:AITC were developed by extrusion. Surface properties were determined from contact angle measurements. Films were immersed in water, aqueous and fatty simulants to assess the absorption capacity and the change in the thermal properties. Moreover, the release of AITC in both simulants was evaluated by UV-spectroscopy and kinetic parameters were determined by data modeling. Results showed that a higher concentration of β-CD:AITC increased the absorption of aqueous simulant of films, favoring the plasticization of PLA. However, the incorporation of β-CD:AITC also avoided the swelling of PLA in fatty simulant. These effects and complex relationships between the polymer, inclusion complexes and food simulant explained the non-systematic behavior in the diffusion coefficient. However, the lower partition coefficient and higher percentage of released AITC to the fatty simulant suggested the potential of these materials for high-fat fruit and vegetable active packaging applications.

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Estimation of Surface Free Energy of Poly(lactic acid) During UV‐Grafting with N‐Vinylpyrrolidone

Cited by 11 publications

References 15 publications

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

Impact of the Incorporation of Nano-Sized Cellulose Formate on the End Quality of Polylactic Acid Composite Film

Development and Evaluation of the Properties of Active Films for High-Fat Fruit and Vegetable Packaging

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