Mechanical and thermal properties of poly(3‐hydroxybutyrate) blends with starch and starch derivatives

Mei, Lucía Helena Innocentini; Bartoli, Júlio Roberto; Baltieri, Rodrigo Cirillo

doi:10.1002/masy.200350708

Cited by 65 publications

(46 citation statements)

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“…So far many blends containing PHB/PHAs have been studied and also many types of plasticizers have been proposed ( [37,38]). The literature reports the use as plasticizers from materials that are cheap and readily available on the market, and generally also of natural origin, such as oxypropylated glycerin (or laprol), glycerol, glycerol triacetate, 4-nonylphenol, 4,40-dihydroxydiphenylmethane, acetyl tributyl citrate, salicylic ester, acetylsalicylic acid ester, soybean oil, epoxidized soybean oil, dibutyl phthalate, triethyl citrate, dioctyl phthalate, dioctyl sebacate, acetyl tributyl citrate, di-2-ethylhexylphthalate, tri(ethylene glycol)-bis(2-ethylhexanoate), triacetine, and fatty alcohols with or without glycerol fatty esters, polyethylene glycol (PEG) as well as low molecular weight polyhydroxybutyrate since PHAs with medium chain length are elastomers with low melting point and a relatively lower degree of crystallinity ( [39,40]).…”

Section: Blending Of Phb With Other Polymers Ormentioning

confidence: 99%

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Bugnicourt¹,

Cinelli²,

Lazzeri³

et al. 2014

Express Polym. Lett.

768

463

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Abstract. Polyhydroxyalkanoates (PHAs) are gaining increasing attention in the biodegradable polymer market due to their promising properties such as high biodegradability in different environments, not just in composting plants, and processing versatility. Indeed among biopolymers, these biogenic polyesters represent a potential sustainable replacement for fossil fuel-based thermoplastics. Most commercially available PHAs are obtained with pure microbial cultures grown on renewable feedstocks (i.e. glucose) under sterile conditions but recent research studies focus on the use of wastes as growth media. PHA can be extracted from the bacteria cell and then formulated and processed by extrusion for production of rigid and flexible plastic suitable not just for the most assessed medical applications but also considered for applications including packaging, moulded goods, paper coatings, non-woven fabrics, adhesives, films and performance additives. The present paper reviews the different classes of PHAs, their main properties, processing aspects, commercially available ones, as well as limitations and related improvements being researched, with specific focus on potential applications of PHAs in packaging.

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Section: Blending Of Phb With Other Polymers Ormentioning

confidence: 99%

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Bugnicourt¹,

Cinelli²,

Lazzeri³

et al. 2014

Express Polym. Lett.

768

463

View full text Add to dashboard Cite

show abstract

“…Other researchers investigated injection-molded blends of PHB with starch and starch derivatives. 15 They observed that blends containing natural starches and starch adipate resulted in brittle materials. Best results were obtained with grafted starch-urethane blends.…”

Section: Introductionmentioning

confidence: 98%

Effect of starch addition on compression‐molded poly(3‐hydroxybutyrate)/starch blends

Thiré

Ribeiro

Andrade

2006

J of Applied Polymer Sci

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Because of their biocompatibility and total biodegradability, poly(3-hydroxybutyrate) (PHB) and starch have attracted attention as promising raw materials for manufacture of single-use plastic items and biomaterials. PHB/ maize starch blends with starch contents in the range of 0 -50 wt % were processed in an internal mixer, and their compression-molded films were characterized by tensile tests, X-ray diffraction, thermogravimetric analysis, wettability measurements, and scanning electron microscopy. Water and glycerol were used as plasticizers. The results indicated that the thermal degradation behavior of the blends were similar to that of pure PHB films. All the blends showed heterogeneous morphology, wherein starch granules were dispersed in continuous PHB-rich matrix. Despite the decrease in elongation at break and tensile strength, starch incorporation of up to 30 wt % into PHB matrix resulted in materials as hard as pure PHB films, but exhibiting less crystallinity and more hydrophilic character, which might lead to a higher biodegradation rate.

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“…Unfortunately, the elongation was still limited. In another study, binary blends of poly(hydroxy butyrate) (PHB) were prepared with natural starch, starch adipate, and grafted starch-urethane derivatives by Innocentini-Mei et al 9 The PHB blends were characterized in terms of their mechanical and thermal properties. Significant decreases in both the glass-transition temperature (T g ) and melting temperature (T m ) were observed for all the formulations.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of biodegradable poly(butylene succinate)/starch blends

Lai

Huang

Shen³

2005

J of Applied Polymer Sci

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ABSTRACT:The vital differences between the use of untreated starch and gelatinized starch in blends with poly(butylene succinate) (Bionolle) were thoroughly examined in this study. The melting temperature decreased slightly with increasing dosages of untreated and gelatinized starch. The added starch perhaps tended to disrupt the intermolecular hydrogen bonding within the Bionolle matrix. On the other hand, a large increase in the crystallinity was seen with the addition of starch. Starch appeared to play a nucleating role in the blends. The trend of the glass-transition temperature decreasing with the starch level was similar to the trend of the melting temperature. For the same starch content, the glass-transition temperature showed some variations. For blends containing a certain amount of gelatinized starch, the thermal stability remained to a certain degree but continued to decrease. This was ascribed to the relatively low heat stability of starch. As for the mechanical properties, a significant increase in the tensile strength (up to 2 times) was observed when untreated starch was replaced with gelatinized starch in the blends. Similarly, the tear strength increased up to 1.5 times if gelatinized starch was employed. Apparently, the gelatinization of starch was efficiently achieved for promoting its compatibility with Bionolle. In all cases, the mechanical properties of Bionolle blended with gelatinized starch were better than those of Bionolle blended with untreated starch. A morphological investigation provided evidence in support of these findings. This relatively low-cost gelatinization approach provides an alternative to a high-cost compatibilizer approach for improving the performance of biodegradable blends.

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Mechanical and thermal properties of poly(3‐hydroxybutyrate) blends with starch and starch derivatives

Cited by 65 publications

References 0 publications

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Effect of starch addition on compression‐molded poly(3‐hydroxybutyrate)/starch blends

Preparation and properties of biodegradable poly(butylene succinate)/starch blends

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