Morphology and thermal properties of biodegradable poly(hydroxybutyrate-co-hydroxyvalerate)/tungsten disulphide inorganic nanotube nanocomposites

Silverman, Tyler; Naffakh, Mohammed; Marco, Carlos; Ellis, Gary

doi:10.1016/j.matchemphys.2015.12.032

Cited by 27 publications

(16 citation statements)

References 53 publications

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“…The value of initial degradation temperature (T i ) was equal to the temperature observed when the initial weight of the heated sample decreased by 2% (T 2 ) [28]. The study pertained also to another important thermal property, namely the correspondence between the applied temperature and the maximum rate of the weight loss (T p ), which is defined as the peak value of the first derivative (DTG) of the TGA curve (Fig.…”

Section: Tga Analysismentioning

confidence: 92%

“…where: ΔH m is melting enthalpy (J/g), ΔH cc is cold crystallization enthalpy (J/g), ΔH o m stands for the melting enthalpy of fully crystalline PHBV which equals to 146 J/g [26][27][28] and w(PHBV) is the weight fraction of PHBV in the sample.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

“…In semicrystalline polymers, the crystallization behavior governs not only the crystalline structure and morphology, but also the final mechanical properties of the material. The PHBV is a semicrystalline polymer that can crystallize from either molten or glassy states, corresponding to melt crystallization and cold crystallization respectively [28]. It was reported that the crystallization of PHB is slow and incomplete, while its melting is complex due to superimposed melting -recrystallization -re-melting processes [39].…”

Section: Dsc Analysismentioning

confidence: 99%

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Novel Biorenewable Composites Based on Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with Natural Fillers

2019

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Due to the ubiquity and single-use character of plastic products, their production represents a burden to the environment. Therefore, an increasing interest in biodegradable and bio-compostable materials has been observed in the recent years. Bio-based materials are becoming more and more popular, especially in applications where biodegradability provides an advantage for customers and environment. However, biodegradable materials are more expensive compared with durable plastic materials, so to reduce costs and in order to improve their mechanical properties, biocomposites are created by reinforcement with natural fibers: cellulose, hemp, jute, cotton, etc. This paper is focused on the investigation of the selected group of biocomposites based on poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with the addition of 15 wt% of various fillers (nanocellulose, walnut shell flour, eggshell flour, and tuff). Thus far, there is limited information concerning comparison of the different natural fillers introduced into the poly(3-hydroxybutyrate-co-3-hydroxyvalerate) matrix. Here, the following mechanical properties were evaluated: the tensile strength, modulus of elasticity, strain at break, flexural modulus, and flexural stress at 3.5% strain. The tensile test was performed at various temperatures (− 24, + 23, and + 60 °C), followed by samples conditioning in water and compost. Thermal behavior of the biocomposites was studied by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The study showed that the value of the elasticity modulus of each composite was higher in comparison with neat poly (3-hydroxybutyrate-co-3-hydroxyvalerate), at each of the above temperatures. The factor responsible for the enhancement of the mechanical properties of composites (enhancement of the stiffness of the material) was the increase in crystalline phase content in composites. Interestingly, at − 24 °C, all of the analyzed composites exhibited over twofold increase in tensile strength which was accompanied by an almost 30% increase in elastic modulus. This phenomenon likely resulted from an increase in tensile strength and an increase in internal stress at interfaces within the components of the composites during tests. It was also observed that both conditioning in water and degradation in the compost heap led to a considerable decrease in mechanical properties of the examined composites. The scanning electron microscopy analysis, carried out to assess the distribution of particles and the adhesion of fillers to the matrix, revealed that the size and the shape of the particles affected the mechanical properties of the composites.

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Section: Tga Analysismentioning

confidence: 92%

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Section: Dsc Analysismentioning

confidence: 99%

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Novel Biorenewable Composites Based on Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with Natural Fillers

2019

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“…The market for biodegradable and bio-based materials is becoming more and more popular, especially in applications where biodegradability provides an advantage for customers and environment. [1,2] Biodegradable polymers are increasingly used in all fields of medicine, for example, as dressings (mainly hydrogels), resorbable surgical threads, bone implants, and as drug delivery systems. [3] Biodegradable polymers are divided into two main groups: polyesters and polyglycols.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Antibacterial Particle Incorporation on the Mechanical Properties, Biodegradability, and Biocompatibility of PLA and PHBV Composites

Mazur

Singh

Friedrich

et al. 2020

Macro Materials & Eng

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The composites based on polylactide (PLA) and poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) with the addition of antibacterial particles: silver (Ag) and copper oxide (CuO) are characterized. Basic mechanical properties and biodegradation processes, as well as biocompatibility of materials with human cells are determined. The addition of Ag or CuO to the polymers do not significantly affect their mechanical properties, flammability, or biodegradation rate. However, several differences between the base materials are observed. PLA‐based composites have higher tensile and impact strength values, while PHBV‐based ones have a higher modulus of elasticity, as well as better mechanical properties at elevated temperatures. Concerning biocompatibility, each of the tested materials support the growth of fibroblasts over time, although large differences are observed in the initial cell attachment. The analysis of hydrolytic degradation effects on the structure of materials shows that PHBV degrades much faster than PLA. The results of this study confirm the good potential of the investigated biodegradable polymer composites with antibacterial particles for future biomedical applications.

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“…The use of plastics in everyday life has increased dramatically during the course of the 20th and 21st century which is primarily due to the characteristics that plastics offer in the development of new products to meet the challenges in modern society. Silverman et al [1] reported that in 2015, approximately 300 million tons of plastic material will be produced around the world, most of which will be derived from the ever depleting petroleum feedstocks and this has resulted in them attracting increasing interest owing to the growing concern with regards to both the environment and decrease in fossil resources [2].…”

Section: Introductionmentioning

confidence: 99%

Degradable Nanocomposites for Fused Filament Fabrication Applications

Healy

Waldron

Geever

et al. 2018

JMMP

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There has been a substantial increase in the use and development of plastics over the last century. However, due to ever-diminishing petroleum feedstocks and growing concern for the environment, there has been a rise in the use of eco-friendly polymers affording similar properties to that of their depleting counterparts. Poly(ε-caprolactone) is one such polymer. This present study investigates the possibility of developing a degradable nanocomposite, suitable for fused filament fabrication, utilizing hot melt extrusion technology to blend poly(ε-caprolactone), poly(ethylene) oxide and the nanoclay halloysite at loadings of two and six weight percent. The extruded blends were characterized using common polymer testing techniques. The addition of poly(ε-caprolactone) to the poly(ethylene) oxide matrix provided a plasticizing effect which was apparent with the melt flow index and melting point of the blends reducing with an increase in poly(ε-caprolactone) content. Upon reinforcing the matrix with halloysite, there was a significant improvement in mechanical properties. The addition of halloysite significantly increased Young's modulus 11% and 25% when the loading was two and six percent respectively. Furthermore, it was also possible to produce a filament with the desired properties, diameter 1.75 mm, for fused filament fabrication, with subsequent studies required to evaluate their printability.

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Morphology and thermal properties of biodegradable poly(hydroxybutyrate-co-hydroxyvalerate)/tungsten disulphide inorganic nanotube nanocomposites

Cited by 27 publications

References 53 publications

Novel Biorenewable Composites Based on Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with Natural Fillers

Novel Biorenewable Composites Based on Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with Natural Fillers

The Effect of Antibacterial Particle Incorporation on the Mechanical Properties, Biodegradability, and Biocompatibility of PLA and PHBV Composites

Degradable Nanocomposites for Fused Filament Fabrication Applications

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