Comparison of the Effect of Plasticizers on PHBV—and Organoclay—Based Biodegradable Polymer Nanocomposites

Slongo, Matheus D.; Brandolt, Suelen Dias Fagundes; Daitx, Tales S.; Mauler, Raquel Santos; Giovanela, Marcelo; Crespo, Janaína da Silva; Carli, Larissa N.

doi:10.1007/s10924-017-1128-9

Cited by 14 publications

(24 citation statements)

References 39 publications

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“…The occurrence of double melting peaks in PHBV is widely reported in the literature and may be related to several factors : the formation of different crystalline phases, recrystallization and melting, different spherulite morphology (lamellar thickness, perfection, and stability), and molar mass. In our previous work, the addition of plasticizers and clays did not alter the crystalline structure of the polymer, and no recrystallization process was evidenced . These findings, together with the set of results found in this work, indicate that the appearance of double melting peaks is likely due to a distribution of crystallite size that resulted from changes in the molar mass due to the random chain scission of the polymer during processing .…”

Section: Resultssupporting

confidence: 77%

“…Neat PHBV and PHBV nanocomposites with optimized amounts of clay (3 wt%) and plasticizer (10 wt%) were obtained in an internal mixer (homemade) at 175°C (for neat PHBV) and 170°C (for the nanocomposites) at 100 rpm for 5 min. The amount of clay and plasticizer and the processing conditions were defined based on the set of results achieved in our previous studies . For comparison, a sample containing 20 wt% of TEC was prepared and characterized by impact strength.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, Branciforti et al reported the crystallinity behavior of these compositions, and they found that both additives facilitate the crystallization process of PHBV. In our previous study , we reported the effect of different plasticizers with OMt on the PHBV nanocomposites properties. Here, TEC was used as a plasticizer for PHBV because it displayed the best performance with regard to producing nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Several scientific studies report the potential to improve the mechanical and thermal PHB properties by adding petrochemical based plasticizers by adding petrochemical based plasticizers e.g. dioctyl adipate, dioctyl phthalate, dibuthyl phalate, polyadipate, poly[di(ethylene glycol)], tri(ethylene glycol), bis (2-ethylhexanoate) [3,[13][14][15] but also selected bio-based plasticizers. In this paper we would like to focus on bio-based plasticizers dedicated for PHA.…”

Section: Introductionmentioning

confidence: 99%

Selected Fatty Acids Esters as Potential PHB-V Bioplasticizers: Effect on Mechanical Properties of the Polymer

et al. 2020

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Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-V) has not been used for demanding technical applications yet due to its limited mechanical properties, particularly its high brittleness. An appropriate route to overcome these limitations is the implementation of plasticizers in the PHB-V matrix via compounding. In this paper the use of different types of fatty acids esters as PHB-V plasticizers were investigated. The study describes how the difference in the fatty acid esters structure (mainly fatty acid hydrocarbon chain length) affects their plasticizing effect and thus the PHB-V ductility performance. The best impact properties of PHB-V compounds were obtained for oleic acid methyl ester, palmitic acid methyl ester or lauric acid ethylene glycol monoester. The increase of notched impact strength from 1.4 (for neat polymer) to 4.0-4.1 kJ/m 2 was observed. At the same time stiffness and strength of the polymer decreased but remain on a level sufficient for technical applications. Additional drawback of PHB-V materials is increasing the brittleness over time. Moreover this study shows that the use of oleic acid ethylene glycol monoester or stearic acid ethylene glycol monoester as plasticizers significantly reduces the increase of the brittleness of PHB-V over time. It is relevant that this drawback of PHB-V materials can be significantly improved by plasticizer addition.

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“…[ 168 ] Although the structural mechanism in which PHBV is piezoelectric is not well characterized, it is known to form spring‐like helices similar to that of collagen which has been theorized to contribute to its piezoelectric effect. [ 169 ] Many studies have evaluated PHBV for osteogenic differentiation. In a comparison study between MSCs seeded onto nonpiezoelectric polycaprolactone (PCL) and PHBV nanofibers, it was found that greater calcium deposition was observed on the PHBV nanofibers.…”

Section: Electrical Stimulationmentioning

confidence: 99%

The Effect of Physical Cues of Biomaterial Scaffolds on Stem Cell Behavior

Wang

Hashemi

Stratton

et al. 2020

Adv Healthcare Materials

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Stem cells have been sought as a promising cell source in the tissue engineering field due to their proliferative capacity as well as differentiation potential. Biomaterials have been utilized to facilitate the delivery of stem cells in order to improve their engraftment and long-term viability upon implantation. Biomaterials also have been developed as scaffolds to promote stem cell induced tissue regeneration. This review focuses on the latter where the biomaterial scaffold is designed to provide physical cues to stem cells in order to promote their behavior for tissue formation. Recent work that explores the effect of scaffold physical properties, topography, mechanical properties and electrical properties, is discussed. Although still being elucidated, the biological mechanisms, including cell shape, focal adhesion distribution, and nuclear shape, are presented. This review also discusses emerging areas and challenges in clinical translation.

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Comparison of the Effect of Plasticizers on PHBV—and Organoclay—Based Biodegradable Polymer Nanocomposites

Cited by 14 publications

References 39 publications

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

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

Selected Fatty Acids Esters as Potential PHB-V Bioplasticizers: Effect on Mechanical Properties of the Polymer

The Effect of Physical Cues of Biomaterial Scaffolds on Stem Cell Behavior

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