Non-isothermal crystallization kinetics from the melt of nanocomposites based on poly(3-hydroxybutyrate) and modified clays

D'amico, David Alberto; Cyras, Viviana P.; Manfredi, Liliana Beatriz

doi:10.1016/j.tca.2014.08.023

Cited by 30 publications

(17 citation statements)

References 36 publications

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“…PHB brittleness has been related with its high crystallinity. 5,42 It was also shown previously that fast cooling rates impeded crystal formation. However, tensile properties estimated showed that mechanical properties are better in blends with low cooling rates (Table II).…”

Section: Tensile Propertiesmentioning

confidence: 63%

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Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Vergara-Porras

Gracida

Pérez-Guevara

2016

J of Applied Polymer Sci

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Poly(β‐hydroxybutyrate) [PHB] is a biodegradable and biocompatible polymer produced by some bacteria genders. To improve mechanical properties, PHB has been blended with other polymers. Compression‐molded blends of PHB and poly(ε‐caprolactone) [PCL] (70/30 mass ratio) were cooled to room temperature following five different thermal treatments after molding at 180 °C. Blends processed with higher cooling rates were easier to biodegrade, nevertheless elongation at break and tensile strength decreased. Slower cooling kinetics and isothermal treatments increased perfection of crystals, as seen in differential scanning calorimetry and X‐ray diffraction and spherulites size. A descriptive model is proposed herein where thermal, biodegradation, tensile properties, and crystal features were related to cooling kinetics applied. It is proposed that properties of 70/30 (PHB/PCL) blends can be predetermined by an adequate control of thermal conditions during processing. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43569.

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Section: Tensile Propertiesmentioning

confidence: 63%

“…PHB brittleness has been related with its high crystallinity . It was also shown previously that fast cooling rates impeded crystal formation.…”

Section: Resultsmentioning

confidence: 99%

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Vergara-Porras

Gracida

Pérez-Guevara

2016

J of Applied Polymer Sci

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“…For Bent, few changes were observed in the crystallization characteristics, and this may be related to the fact that the clay platelets hinder the crystallite growth by reducing the mobility of the chain segments. D'Amico et al found that different OMt promoted a slower crystallization rate of PHB because the platelets hindered the mobility of the chains without varying the final degree of crystallinity. Therefore, the increase in the viscosity resulting from the well‐dispersed Bent overcame the nucleating effect and had a negative effect on the crystal growth process.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect between different clays and plasticizer on the properties of PHBV nanocomposites

et al. 2019

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The aim of this study was to evaluate the effect of the plasticizer triethyl citrate (TEC) combined with two different clays [unmodified bentonite (Bent) and halloysite (Hal)] on the morphology, crystallization behavior, and mechanical properties of poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV). The compositions were prepared with 3 wt% clay and 10 wt% TEC by melt processing. The addition of TEC resulted in a plasticized effect with 15 C lower glass transition temperature compared with the neat PHBV. An increase in the mechanical performance was achieved when clay and plasticizer were combined, and this improvement was dependent on the degree of dispersion of the nanoparticles in the polymer matrix. For the combination of Hal and TEC, which most affected the crystallization process of PHBV, the impact strength was improved by 135% without a significant loss in the elastic modulus of the material. The synergistic effect between the plasticizer and clay was responsible for these improvements, making this a viable alternative for extending the use of this polymer in various industrial applications. POLYM. COMPOS., 40:3835-3843, 2019.POLYMER COMPOSITES-2019 FIG. 2. (a) Crystallization (cooling scan) and (b) melting (heating scan) curves of PHBV compounds (temperature error: AE1.0 C).

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“…However, the addition of organofilized particles has caused the opposite effect, i.e., an increase in K g . The effect of the type of organic modification has been highlighted by D'Amico et al in their study of the melt crystallization of poly(3‐hydroxybutyrate) in the presence of Na + montmorillonite clay organically modified in three different ways: first, by ion exchange with tributylhexadecylphosphonium bromide; second, by acid activation followed by ion exchange with tributylhexadecylphosphonium bromide; third, by acid activation followed by silylation. The addition of clay modified via the first procedure has caused a noticeable increase in the K g value estimated from isoconversional analysis.…”

Section: Crystallization and Melting Of Polymersmentioning

confidence: 99%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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This article surveys the decade of progress accomplished in the application of isoconversional methods to thermally stimulated processes in polymers. The processes of interest include: crystallization and melting of polymers, gelation of polymer solutions and gel melting, denaturation (unfolding) of proteins, glass transition, polymerization and crosslinking (curing), and thermal and thermo-oxidative degradation. Special attention is paid to the kinetics of polymeric nanomaterials. The article discusses basic principles for understanding the variations in the activation energy and emphasizes the possibility of using models for linking such variations to the parameters of individual kinetic steps. It is stressed that many kinetic effects are not linked to a change in the activation energy alone and may arise from changes in the preexponential factor and reaction model. Also noted is that some isoconversional methods are inapplicable to processes taking place on cooling and cannot be used to study such processes as the melt crystallization.

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Non-isothermal crystallization kinetics from the melt of nanocomposites based on poly(3-hydroxybutyrate) and modified clays

Cited by 30 publications

References 36 publications

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Synergistic effect between different clays and plasticizer on the properties of PHBV nanocomposites

Isoconversional Kinetics of Polymers: The Decade Past

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