Effect of compounding and starch modification on properties of starch-filled low-density polyethylene

Evangelista, Roque L.; Sung, Wei; Jane, Jay Lin; Gelina, Robert J.; Nikolov, Z̆ivko L.

doi:10.1021/ie00056a025

Cited by 99 publications

(40 citation statements)

References 9 publications

(15 reference statements)

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“…Thus, in contrast to the controls, an increase in processing time from 5 to 20 min has no signi®cant effect on the apparent viscosity of these samples. Since industrially produced low density polyethylene-starch blends contain 6±9 wt% starch, 23 it may be possible to give similar suggestions for PP-6 wt% starch blends. Figure 6 shows the effect of processing time on carbonyl index (A 1721 cm À1/A 2720 cm À1) of ®lms containing different starch concentrations compared with the control.…”

Section: Resultsmentioning

confidence: 97%

Effect of processing on the melt degradation of starch-filled polypropylene

Bagheri

1999

Polym. Int.

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Compounded polypropylene powders with various concentrations of corn starch were processed in a Haake torque rheometer at constant temperature, 180 °C, for different times in a closed system. A scanning electron micrograph of 5‐min processed sample shows a fine dispersion of starch particles in the polypropylene (PP) matrix. A good distribution and interaction of the starch particles are seen with increasing processing time (up to 15 min). Infrared spectroscopy evidence on the extracted films shows that most interactions between PP and starch are obtained after about 10 min processing. The presence of 2–6 wt% starch in the PP has a melt‐stabilising effect by reducing melt flow index and increasing apparent viscosity with a good correlation. However, 6 wt% starch gives complete inhibition of the PP melt degradation up to 20 min processing. Carbonyl groups are not formed during processing of PP containing 6 wt% starch. This is also an indication of a starch stabilising effect on the PP chemical structure. An increase in elongation at break of PP films having 6 wt% starch, when compared with the controls, is observed, while their ultimate tensile strength remains almost the same. © 1999 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Effect of processing on the melt degradation of starch-filled polypropylene

Bagheri

1999

Polym. Int.

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“…A similar behavior was also observed with cast LL-DPE/starch films. 16 Their decreasing strength with increasing starch content was attributed to the poor interfacial adhesion of the two components. Thus, an interesting question rising is how stress-transfer, from the weaker polymeric matrix to stiffer and stronger starch particles, can take place in injection-molded specimens, while does not in films.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Processing and characterization of LDPE/starch products

Matzinos

Bikiaris

Kokkou

et al. 2001

J. Appl. Polym. Sci.

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“…To overcome this problem, attempts have been made to impart hydrophobicity to starch by esterification. Octaonated starch, 7 for example, has been found to impart hydrophobicity to starch. However, a higher loading of this modified starch in low-density polyethylene (LDPE) is found to cause significant reduction in the mechanical properties as compared to neat LDPE.…”

Section: Introductionmentioning

confidence: 99%

Use of poly(ethylene‐co‐vinyl alcohol) as compatibilizer in LDPE/thermoplastic tapioca starch blends

Sailaja

Chanda

2002

J of Applied Polymer Sci

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Poly(ethylene-co-vinyl alcohol) (EVOH) was used as a compatibilizer to make blends of low-density polyethylene (LDPE) and plasticized starch (TS). The tensile properties and impact strength were measured and compared with those of neat LDPE. The morphology of the blend specimens, both fractured and unfractured, was observed by scanning electron microscopy. Comparison of the properties showed that the impact strength of the blend improves significantly by the addition of a compatibilizer even with a high TS loading of 40 and 50% (by weight). A high elongation at break almost matching that of neat polyethylene was also obtained. The blend morphology of the etched specimens revealed fine dispersion of the starch in the polyethylene matrix, while the fracture surface morphology clearly indicate that the failure of compatibilized blends occurs mainly by the ductile mode.

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Effect of compounding and starch modification on properties of starch-filled low-density polyethylene

Cited by 99 publications

References 9 publications

Effect of processing on the melt degradation of starch-filled polypropylene

Effect of processing on the melt degradation of starch-filled polypropylene

Processing and characterization of LDPE/starch products

Use of poly(ethylene‐co‐vinyl alcohol) as compatibilizer in LDPE/thermoplastic tapioca starch blends

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