Degradability of composites of low density polyethylene/polypropylene blends filled with rape straw

Kijeńska, Marta; Kowalska, E.; Pałys, Barbara; Ryczkowski, J.

doi:10.1016/j.polymdegradstab.2009.12.023

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…Polyethylene, a thermoplastic polymer, is used in many industries, especially in the packaging industry [5,12]. Natural and synthetic products and their wastes are used as reinforcing elements to improve polyethylene properties which are deficient in some application areas [13][14][15]. In this study, hydrolyzed electrostatic powder coating waste was used as filler material for linear low-density polyethylene (LLDPE), and changes in the mechanical properties and fluidity of LLDPE compounds were determined.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications

Kısmet

Wagner²

2016

Journal of Polymer Engineering

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Potential of using powder coating recyclates as filler material for polyethylene compounds was investigated. Due to their strong adhesion to the metal surface during compounding at extrusion temperatures higher than 100°C, the coating powder recyclates were chemically modified to facilitate its processing by extrusion and injection molding at higher temperatures. For this purpose, the coating powder recyclates were first hydrolyzed with addition of an alcohol as swelling agent. The deactivated recyclates were mixed at different ratios with the matrix polymer, a linear low-density polyethylene (LLDPE). The mixtures obtained were then compounded by extrusion and subsequently injection molded to plates to produce specimens for testing. The resulting samples were characterized mechanically by tensile, bending, and impact strength tests. In summary, the powder coatings recyclates can be processed as filler for thermoplastic material, without any adhesion problems up to 160°C and 180°C in the extruder and in the injection molding machine, respectively.

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Section: Introductionmentioning

confidence: 99%

Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications

Kısmet

Wagner²

2016

Journal of Polymer Engineering

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“…Results of the hitherto studies on recycling of thermoplastic polymers with lignocellulose fillers have been described in many papers, but they have not concerned the systems of polypropylene–rapeseed straw. Much attention has been paid to studies on degradability of other composites . Thorough investigation of recycling of composites reinforced with sisal or hemp fibers has been made by Bourmaud and Baley, who have analyzed the topography of composites surface, their mechanical, rheological, and thermal properties .…”

Section: Introductionmentioning

confidence: 99%

Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Paukszta

Markiewicz

Ostrowski

et al. 2014

J of Applied Polymer Sci

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Composites of isotactic polypropylene filled with comminuted rapeseed straw are studied. Improvement in interfacial adhesion is achieved by chemical modification of the lignocellulose filler. Composites were subjected to recycling by extrusion. The effect of multiple recycling of the composites on the process of nucleation and crystallization of polypropylene matrix, surface topography, and free radical generation was checked. On the basis of differential scanning calorimetry data, a significant influence of the recycling on nucleation activity of the lignocellulose filler was evidenced. A relation between the filler particle size and multiple recycling was established by observations under a polarization microscope, while scanning electron microscope analyses confirmed the positive effect of chemical modification of rapeseed straw on the interfacial adhesion. The composite structure changes forced by multiple recycling are discussed in the context of free radical generation. Concentration of free radicals in the rapeseed straw samples and composites was measured by the electron paramagnetic resonance spectroscopy to show that it was higher in the systems subjected to multiple recycling. Interestingly, the composites after multiple recycling showing elevated concentration of free radicals are also characterized by higher nucleation activity.

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“…1 Careless dumping of plastics in land-fills and sea water has long term adverse effects on the environment, human beings and marine life. [6][7][8][9][10][11][12][13][14][15] Majid et al 10 studied the effect of natural weathering on LDPE/thermoplastic sago starch blends with and without polyethylene grafted maleic anhydride (PE-g-MA) as compatibilizer. [2][3][4][5] Since natural polymers such as starch are susceptible to bacterial attack, blending of polyethylene with starch makes polyethylene prone to natural degradation.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] Since natural polymers such as starch are susceptible to bacterial attack, blending of polyethylene with starch makes polyethylene prone to natural degradation. [6][7][8][9][10][11][12][13][14][15] Majid et al 10 studied the effect of natural weathering on LDPE/thermoplastic sago starch blends with and without polyethylene grafted maleic anhydride (PE-g-MA) as compatibilizer. They observed that both tensile strength and elongation at break decreased with weathering time for both compatibilized and uncompatibilized blends.…”

Section: Introductionmentioning

confidence: 99%

Natural weather, soil burial and sea water ageing of low‐density polyethylene: Effect of starch/linear low‐density polyethylene masterbatch

Elanmugilan

Sreekumar

Singha

et al. 2012

J of Applied Polymer Sci

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Degradation of the blends of low-density polyethylene (LDPE) with a starch-based additive namely, polystarch N was studied under various environmental conditions such as natural weather, soil and sea water in Saudi Arabia. Stress-strain properties and thermal behavior were investigated for the LDPE and LDPE/polystarch N blend having 40% (w/w) of polystarch N. Environmental ageing resulted in the reduction of percentage of elongation and crystallinity for the blend. Rheological studies and scanning electron microscope photomicrographs of the polymer samples retrieved after ageing showed that addition of polystarch N enhanced the degradation of LDPE. This is ascribed to high extent of chain scission and leaching out of starch present in polystarch N, which was corroborated by the results of morphology and Fourier transform infrared spectroscopy analyses. In the case of underground soil ageing, microbes present in the soil consume the starch in the blend, thus accelerating the degradation process.

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Degradability of composites of low density polyethylene/polypropylene blends filled with rape straw

Cited by 22 publications

References 14 publications

Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications

Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications

Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Natural weather, soil burial and sea water ageing of low‐density polyethylene: Effect of starch/linear low‐density polyethylene masterbatch

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