Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) nanocomposites with optimal mechanical properties

Xie, Yuping; Kohls, D. J.; Noda, Isao; Schaefer, Dale W.; Akpalu, Yvonne A.

doi:10.1016/j.polymer.2009.07.023

Cited by 51 publications

(48 citation statements)

References 93 publications

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“…The addition of clay mineral nanoparticles favored the biodegradation rate of both polymers [8,13] . However, in the case of silica nanocomposites, the observed improvement in mechanical properties was reported not to be due to changes in crystallinity or spherulitic morphology [5] . Many works have been published on PHAs blends, especially with other biodegradable polymers.…”

Section: Introductionmentioning

confidence: 98%

“…At 5 wt% composition, CNW contributed to increases of 77% in Young's modulus and 41% in storage modulus [10] . An organically-modified montmorillonite was also shown to act as nucleating agent for PHB [8] in the same way as silica nanospheres and nanofibers for PHBV with 7.2 mol% of hydroxyhexanoate units [5] . The addition of clay mineral nanoparticles favored the biodegradation rate of both polymers [8,13] .…”

Section: Introductionmentioning

confidence: 99%

“…An excess of a carbon source and limiting concentrations of essential nutrients are required for their production. Poly(3-hydroxybutyrate) (PHB) and the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) are produced commercially, but their high melting point (>170º), high crystallinity and brittleness, and a narrow processing window, hinder their practical application [3][4][5] . Improved properties have been achieved for PHA copolymers of 3-hydroxybutyrate and other medium-chain length 3-hydroxyalcanoate comonomers.…”

Section: Introductionmentioning

confidence: 99%

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Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1:1 blend nanocomposites

Magalhães¹,

Andrade²

2013

Polímeros

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Melt blending of 1:1 poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and glycerol-plasticized starch (TPS) was performed in the presence of an organically-modified montmorillonite, incorporated at 2.5, 5, 7.5 and 10 wt% amounts. Scanning electron micrographs (SEM) revealed the role of the organoclay as a compatibilizing agent for the immiscible blend. The blends were also characterized by X-ray diffraction (XRD), tensile tests, humidity absorption and soil burial biodegradation tests. The results indicated improved properties of the hybrid materials in relation to TPS alone, with a faster biodegradation rate than PHBV.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1:1 blend nanocomposites

Magalhães¹,

Andrade²

2013

Polímeros

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“…Co-polymer Methyl, with propyl 10%HH×120 Medical applications (Babul et al 2013;Averous and Pollet 2012;Chang et al 2014;Coen and Dehority 1970;Xie et al 2009) Poly (hydroxybutyrate-cohydroxyvalerate) (PHBV)…”

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confidence: 99%

Review on the current status of polymer degradation: a microbial approach

Pathak

Bithel

2017

Bioresour. Bioprocess.

557

241

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Inertness and the indiscriminate use of synthetic polymers leading to increased land and water pollution are of great concern. Plastic is the most useful synthetic polymer, employed in wide range of applications viz. the packaging industries, agriculture, household practices, etc. Unpredicted use of synthetic polymers is leading towards the accumulation of increased solid waste in the natural environment. This affects the natural system and creates various environmental hazards. Plastics are seen as an environmental threat because they are difficult to degrade. This review describes the occurrence and distribution of microbes that are involved in the degradation of both natural and synthetic polymers. Much interest is generated by the degradation of existing plastics using microorganisms. It seems that biological agents and their metabolic enzymes can be exploited as a potent tool for polymer degradation. Bacterial and fungal species are the most abundant biological agents found in nature and have distinct degradation abilities for natural and synthetic polymers.

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“…Some researchers emphasize the morphology of the filler [4][5][6][7][8]; others focus on the interface between the filler and the elastomer [9][10][11]; others believe the dispersion of the filler is the critical factor that controls performance [12,13]. There is also evidence that enhanced properties are due to changes in the matrix, such as the degree of crystallinity [14,15].…”

Section: Introductionmentioning

confidence: 99%

Morphology of Highly Dispersing Precipitated Silica: Impact of Drying and Sonication

Schaefer

Kohls

Feinblum³

2011

J Inorg Organomet Polym

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Light and X-ray scattering are used to examine the structure of two commercial precipitated silicas (Zeosil 1165 and Ultrasil 7005) and one developmental precipitated silica, Dimosil 288. All three products have a fourlevel hierarchical structure consisting of primary particles, aggregates, hard agglomerates and soft agglomerates, with Dimosil 288 showing the clearest evidence of the four structural levels. The impact of sonication and drying protocol was explored by light scattering for Dimosil 288. With the exception of the large-scale soft agglomerates, all the structural levels are robust under sonication of aqueous suspensions. Sonication breaks down soft agglomerates leaving hard structures approximately 11 lm in radiusof-gyration. Drying plays a critical role in hardening the soft agglomerates. If the product is never dried, sonication reduces the agglomerate size to 3.5 lm, which is identified as the size of the hard agglomerate. Although agglomerates larger than 3.5 lm are present in the never-dried product, they are friable. Large-scale agglomerates are marginally more robust when dried at 150°C compared to room temperature drying. Given the similarity of mechanical properties of rubbers filled with these silicas, it appears that the four-level structure with friable large-scale soft agglomerates is a characteristic of highly dispersing silica products.

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Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) nanocomposites with optimal mechanical properties

Cited by 51 publications

References 93 publications

Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1:1 blend nanocomposites

Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1:1 blend nanocomposites

Review on the current status of polymer degradation: a microbial approach

Morphology of Highly Dispersing Precipitated Silica: Impact of Drying and Sonication

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