Properties of fatty-acid esters of starch and their blends with LDPE

Thiebaud, S.; Aburto, Jorge; Alric, Isabelle; Borredon, Elisabeth; Bikiaris, D.; Prinos, J.; Panayiotou, Costas

doi:10.1002/(sici)1097-4628(19970725)65:4<705::aid-app9>3.0.co;2-o

Cited by 148 publications

(84 citation statements)

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“…This increase in thermal stability with increasing DS was attributed to the low amount of remaining hydroxyl groups in starch molecules after modification. The decomposition of starch occurs as a result of the inter-or intramolecular dehydration reactions having water as a main product of decomposition [7]. The opportunity for this condensation reaction was reduced with substitution of hydroxyl group by fatty acid ester group and higher DS contribute to its thermal stability.…”

Section: Thermogravimetric Analysissupporting

confidence: 56%

“…The initial degradation of native starch began at 280°C with a weight loss of 30%. Further heating, to 600°C, resulted in carbonisation and ash formation as reported [7]. The TGA has shown that the esterification of starch increases its thermal stability.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…A number of authors [4][5][6][7] have reported the preparation of esterified starches of higher degrees of substitution, in presence of organic solvents so as to provide suitable reaction conditions. Sophisticated experimental techniques, solvents, or systems of solvents, are used to achieve homogeneous modification of the chosen starch.…”

Section: Introductionmentioning

confidence: 99%

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Enzymatic modification of cassava starch by bacterial lipase

Rajan

Abraham

2006

Bioprocess Biosyst Eng

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Enzymatic modification of starch using long chain fatty acid makes it thermoplastic suitable for a myriad of industrial applications. An industrial lipase preparation produced by Burkholderia cepacia (lipase PS) was used for modification of cassava starch with two acyl donors, lauric acid and palmitic acid. Reactions performed with palmitic acid by liquid-state and microwave esterification gave a degree of substitution (DS) of 62.08% (DS 1.45) and 42.06% (DS 0.98), respectively. Thermogravimetric analysis showed that onset of decomposition is at a higher temperature (above 600 degrees Celsius) for modified starch than the unmodified starch (280 degrees Celsius). Modified starch showed reduction in alpha-amylase digestibility compared to native starch (76.5-18%). Swelling power lowered for modified starch as esterification renders starch more hydrophobic, making it suitable for biomedical applications as materials for bone fixation and replacements, carriers for controlled release of drugs and bioactive agents. Thus enzymatic esterification is ecofriendly.

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Section: Thermogravimetric Analysissupporting

confidence: 56%

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Enzymatic modification of cassava starch by bacterial lipase

Rajan

Abraham

2006

Bioprocess Biosyst Eng

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“…In general, the preparation of long-chain fatty acid esters of starch is carried out by converting the polymer with the acid chloride in a slurry medium like dioxan (Teng and Rha 1970), N,N-dimethyl formamide (DMF, Peltonen and Harju 1994), toluene (Lower 1996;Bader et al 1997), and pyridine (Aburto et al , 1999aThiebaud et al 1997;Bikiaris et al 1999). In addition, n-hexane (Bader et al 1997) and mixtures of carbon tetrachloride/ ethanol (Whistler 1988) and dioxan/toluene (Gros and Feuge 1962) have been applied.…”

Section: Introductionsupporting

confidence: 53%

“…Although they show a variety of promising properties, e.g. thermoplasticity (Aburto et al , 1999aThiebaud et al 1997;Bikiaris et al 1999;Sagar and Merrill 1995;Frigant et al 1998) and they are of interest as dipcoatings both in food and non-food area (Gros and Feuge 1962;Rooney 1976), no commercial application was realized up to now. Moreover, various patents claim the use as binders in coating, adhesive and ink compositions (Jonker 1991), as chewing gum base (Teng and Rha 1970), as thermoplastic, hydrophobic coating material (Bader et al 1997) and applications for hot-melt adhesives and in controlled release (Peltonen and Harju 1994).…”

Section: Introductionmentioning

confidence: 99%

Starch Derivatives of High Degree of Functionalization 11: Studies on Alternative Acylation of Starch with Long-chain Fatty Acids Homogeneously in N,N-dimethyl acetamide/LiCl

Grote

Heinze

2005

Cellulose

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Starch materials of different amylose content were allowed to react with saturated and unsaturated fatty acids of varying chain length from C 14 to C 18 under homogeneous conditions applying the solvent N,N-dimethyl acetamide in combination with LiCl. As reagent the corresponding acid chlorides and, alternatively, carboxylic acids in situ activated with toluene-4-sulfonyl chloride and N,N¢-carbonyldiimidazole (CDI) were studied. Using fatty acid chlorides (FACl) and toluene-4-sulfonyl chloride-activated acids an almost complete substitution of the starch occurs. By in situ activation of the fatty acids with CDI, products with a degree of substitution up to 2 were obtained, which, in particular, represents a simple and very mild procedure.

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Mechanical properties and biodegradability of LDPE blends with fatty-acid esters of amylose and starch

Bikiaris¹,

Aburto²,

Alric³

et al. 1999

J. Appl. Polym. Sci.

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In the present article a series of low-density polyethylene (LDPE) blends with different amounts of fatty esters of amylose and starch, were prepared in a Haake-Buchler Reomixer. The tensile as well as the dynamic thermomechanical (DMTA) properties of the blends were measured. It was found that as the amount of the esters increases in the blends, the tensile strength and especially the elongation at break decrease nonlinearly. Scanning electron microscopy (SEM) was used to assess the interfacial adhesion between LDPE and the corresponding esters. The incompatibility of the blends was also verified with DMTA and differential scanning calorimetry (DSC). From the biodegradation studies of the blends during exposure in activated sludge, it was found that all esters are biodegradable, although to a much lesser degree compared to pure strach. The biodegradation rate of the composites is relatively small due to the low biodegradation rate of the pure esters.

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Properties of fatty-acid esters of starch and their blends with LDPE

Cited by 148 publications

References 0 publications

Enzymatic modification of cassava starch by bacterial lipase

Enzymatic modification of cassava starch by bacterial lipase

Starch Derivatives of High Degree of Functionalization 11: Studies on Alternative Acylation of Starch with Long-chain Fatty Acids Homogeneously in N,N-dimethyl acetamide/LiCl

Mechanical properties and biodegradability of LDPE blends with fatty-acid esters of amylose and starch

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