Biodegradable Nanocomposites Based on the Polyester Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) and Layered Silicate or Expanded Graphite

Zhang, Xiujuan; Gui, Lin; Abou-Hussein, Reda; Allen, William M.; Noda, Isao; Mark, J. E.

doi:10.1080/10601320801977624

Cited by 16 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… a Polymers in this study. b Reference . c References and . d Reference . e Reference . f Reference . g References − . h Reference . m Reference . i Reference . j Reference . k Reference . l References , , and . n Reference . o References and p Reference . q Reference . r Reference . s Reference . t Reference . u Particle diameter was usually given as a range: here we present an estimated median value. v Aspect ratio (measd) was estimated by dividing the range of particle diameters by the estimated median value for particle thickness that was found in the specified references. Aspect ratio (calcd) was determined from E c / E m versus φ data using the equations of Tandon and Weng. w C:O (the ratio of carbon to oxygen atoms in the filler material). x Solvents: TCM (chloroform), DCM (dichloromethane) DMK (acetone), DMF ( N , N -dimethylformamide). …”

Section: Resultsmentioning

confidence: 99%

Poly(hydroxyalkanoate) Elastomers and Their Graphene Nanocomposites

2014

View full text Add to dashboard Cite

Medium-chain-length poly(hydroxyalkanoate)s (PHAmcl) are biodegradable and renewable biopolymers with elastomeric qualities. Here we report on the preparation and characterization of composite materials using thermally reduced graphene (TRG) nanoparticles as filler with three PHAmcl polymers. The matrices vary with respect to chain packing length, capacity for noncovalent bonding with the TRG surface, and the presence of covalent cross-linking. Results show that the addition of up to 2.5 vol % TRG to PHAmcl increases the melting temperature by 1–3 °C, the modulus by 200–590%, and the electrical conductivity by >7 orders of magnitude. Additionally, we use rheology and microscopy to characterize the composites. We discuss our results in light of polymer entanglement theory and the effects of polymer structure, filler loading volume, and the role of graphene-polymer interfacial forces. We extend our discussion by comparing the modulus enhancements of PHAmcl composites to those reported in other studies in which layered carbon nanofillers are combined with structurally related biopolyesters including: polylactide, polylactide-co-polyglycolide, polycaprolactone, and two other PHA copolymers.

show abstract

Section: Resultsmentioning

confidence: 99%

Poly(hydroxyalkanoate) Elastomers and Their Graphene Nanocomposites

2014

View full text Add to dashboard Cite

show abstract

“…An intercalated nanocomposite of PHBHV-clay was developed by using melt extrusion in a Brabender mixer at 165 °C, and at 50 rpm for 15 min [149]. Zhang et al [150] described the preparation of PHBHHx/layered silicates and PHBHHx/expanded graphite nanocomposites. where a lower content of nanofiller facilitated the production of an exfoliated morphology with good dispersion.…”

Section: Nanocomposites Of Pha Blendsmentioning

confidence: 99%

Bioplastic Polyhydroxyalkanoate (PHA): Recent Advances in Modification and Medical Applications

Mukheem¹,

Hossain²,

Shahabuddin³

et al. 2018

Preprint

View full text Add to dashboard Cite

A wide variety of bacteria are found to be the tiny factories in the production of polyhydroxyalkanoate (PHA) biopolymer. PHA is the polyesters of 3-hydroxyalkanoic acids which occur in bacteria when the bacteria is subjected to nutrient limitation and simultaneously fed with an excess amount of carbon. This unfavorable condition forces the bacteria to store carbon in the form of resorbable cellular inclusions called PHA. Biosynthesized PHA has the ability to replace the currently feasible harmful petroleum based plastics to biobased plastics. PHA research is being focused mainly on two facts - bulk production of environment friendly low-cost PHA and functional group modification for multiple applications to mankind. Many companies are already producing PHA with highly tunable properties and are looking into economically feasible technologies for mass production of PHA. The core focus of PHA research includes a selection of potential PHA producers and low to zero cost carbon sources such as carbon containing wastages of household, farms and industries. This challenge of “trash to treasure” still remains to attain. Tunable properties of PHA have made them a more interesting biomaterial to blend with suitable biopolymers including bioactive compounds. Under precise physiological environment, PHA blends can deliver promising mechanical properties, acting as effective drug carriers and showing time bound degradation. Perhaps desirably tuned PHA may address many health issues including orthopedics - load bearing cartilage, artificial membranes for kidneys, heart and wound management. PHA has high immunotolerance, low toxicity and sustained biodegradability, which have attracted diverse scientist with many medical advancements such as bioabsorbable sutures and 3D structures. In the near future, it is expected to derive many smart auto controllable products from PHA such as microsphere, which could be utilised for a range of applications much more than just drug delivery. Furthermore, naturally produced hybrid PHA will be an interesting candidate as they possess essential properties for targeted applications without further artificial blending or incorporating any components.

show abstract

“…A few studies have been done regarding the addition of submicron‐ or nanosized inorganic particles to a PHBHHx matrix, however a significant improvement in crystallization properties has not yet been reported. Xie et al .…”

Section: Introductionmentioning

confidence: 99%

“…Talc was found to be an effective nucleating agent for accelerating the crystallization rate in PLA, whereas the finer talc particles were found to lead slightly to higher degrees of crystallinity. 23 A few studies have been done regarding the addition of submicronor nanosized inorganic particles to a PHBHHx matrix, 11,[26][27][28][29] however a significant improvement in crystallization properties has not yet been reported. Xie et al (2009) observed slight increases (at concentrations 3 wt %) and decreases (at concentrations 3 wt %), of the order of 5 8C-10 8C, in crystallization peak temperature upon addition of silica nanospheres and -fibers.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrafine talc on crystallization and end‐use properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)

Vandewijngaarden

Murariu

Dubois

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a highly versatile polyhydroxyalkanoate. To enhance its slow crystallization, the performance of ultra-fine talc (median diameter of 1 mm) as a nucleating agent is studied. This study focuses on crystallization, but also on the effect on fundamental properties (i.e., thermal stability) and selected end-use properties (i.e., color, opacity, tensile properties, and gas permeability), to assess its applicability for food packaging purposes. Samples containing 0.5, 1, and 2 wt % were prepared through melt blending and compression molding. First, it was proven that ultra-fine talc is a highly performant nucleating agent for PHBHHx. The isothermal crystallization half time at 70 8C was reduced to 97% by adding 2 wt % of talc, which could greatly improve the processability of PHBHHx. Thermal stability increased with 3-4 8C, due to increased barrier effect. Permeability for O 2 , CO 2 , and water vapor increased slightly upon addition of 0.5 wt % and 1 wt % talc, but decreased at 2 wt % talc. Nevertheless, the results remained within the same applicability range. An acceptable total color change of 0.9 was observed. Furthermore, the PHBHHx matrix was rendered stiffer (Young's modulus increased with 100 MPa), while showing hardly any change in elongation at break or tensile strength. Overall, it can be concluded that ultrafine talc is a very efficient nucleating agent for PHBHHx. Besides the beneficial effect on crystallization, the ultrafine talc hardly influenced any other property, which could prove to be of high added value for the application of these composites as food packaging material.

show abstract

Biodegradable Nanocomposites Based on the Polyester Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) and Layered Silicate or Expanded Graphite

Cited by 16 publications

References 41 publications

Poly(hydroxyalkanoate) Elastomers and Their Graphene Nanocomposites

Poly(hydroxyalkanoate) Elastomers and Their Graphene Nanocomposites

Bioplastic Polyhydroxyalkanoate (PHA): Recent Advances in Modification and Medical Applications

Effect of ultrafine talc on crystallization and end‐use properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)

Contact Info

Product

Resources

About