Susceptibility of enhanced environmentally degradable polyethylene to thermal and photo-oxidation

Albertsson, Ann‐Christine; Barenstedt, Camilla; Karlsson, Sigbritt

doi:10.1016/0141-3910(92)90080-o

Cited by 107 publications

(20 citation statements)

References 20 publications

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“…Even the biodegradation of starch itself is reduced, probably because of its inaccessibility to enzymes [87]. Degradation of blends of starch with synthetic polymers, such as polyethylene, made according to the Griffin technology could be observed when autoxidants such as unsaturated fatty acids and trace amounts of metal ions (Fe, Cu, Mn) catalyzing oxidative degradation are added to the blend [2]. These new starch blends, marketed under the name Ecostar plastics, have a degradation time of 3-5 years compared to hundreds of years for the synthetic plastic alone.…”

Section: Starch-based Plasticsmentioning

confidence: 99%

Plant polymers for biodegradable plastics: Cellulose, starch and polyhydroxyalkanoates

1995

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Section: Starch-based Plasticsmentioning

confidence: 99%

Plant polymers for biodegradable plastics: Cellulose, starch and polyhydroxyalkanoates

1995

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“…Thus, this mechanism depends on the polymer's environment and desired application. 8,9 High shearing forces operate on the polypropylene macromolecules during the initial stages of the starch ®lled PP processing and this leads to the formation of a relatively high concentration of reactive macroalkyl radicals. 10 In the presence of oxygen in the mixer, the reaction occurring is inevitably peroxidation.…”

Section: Introductionmentioning

confidence: 99%

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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“…Further abiotic degradation of such polyethylene can reduce molecular mass to levels where the material becomes susceptible to biodegradation [3,[5][6][7][8]. Prodegradant additives are used to enhance such oxo-biodegradation of polyolefins [4,[7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Mn2Al-LDH- and Co2Al-LDH-stearate as photodegradants for LDPE film

Magagula

Nhlapo

Focke

2009

Polymer Degradation and Stability

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The layered double hydroxides (LDH) Mn 2 Al-LDH-stearate and Co 2 Al-LDH-stearate were prepared by a surfactant-assisted intercalation of the corresponding precursor LDH-CO 3 forms.These compounds were evaluated as potential photodegradant additives in low density polyethylene films with a thickness of ca. 40 mm. They were incorporated into blown polyethylene films via a 10% masterbatch. The films were subjected to accelerated ageing in a QUV weatherometer. The machine was fitted with A320 lamps and operated on a dry cycle at 63 C and an irradiance of 0.67 W/m 2 . It was found that 100 h of QUV exposure was sufficient to cause mechanical embrittlement of films containing as little as 0.1% of either active.

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Susceptibility of enhanced environmentally degradable polyethylene to thermal and photo-oxidation

Cited by 107 publications

References 20 publications

Plant polymers for biodegradable plastics: Cellulose, starch and polyhydroxyalkanoates

Plant polymers for biodegradable plastics: Cellulose, starch and polyhydroxyalkanoates

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

Mn2Al-LDH- and Co2Al-LDH-stearate as photodegradants for LDPE film

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