Polypropylene compounding with post-consumer material

Martins, Milene Heloisa; Paoli, Marco-Aurélio De

doi:10.1016/s0141-3910(02)00195-7

Cited by 52 publications

(44 citation statements)

References 9 publications

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“…Considering the short service life of most plastics, especially in packaging applications, re-using is an option to extend their life cycle. Re-using consumes less energy than other recycling techniques, which makes it a more preferable approach (Martins and De Paoli 2000;Kazemi et al 2007;Jakubowicz and Enebro 2012;Kazemi 2013).…”

Section: Introductionmentioning

confidence: 99%

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Kaymakçı¹,

Ayrılmış²

2016

BioResources

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The influence of repeated cycles of injection molding on some mechanical and thermal properties of wood plastic composites (WPCs) was investigated. Pine wood flour (50 wt%) was mixed with HDPE (50 wt%) containing compatibilizing agent (MAPE, 3 wt%) in a co-rotating twinscrew extruder. The test specimens were produced by injection molding from the pellets dried to the moisture content (MC) of 1%. After the mechanical properties of the WPC test specimens were determined, the failed specimens were subsequently pelletized. These pellets were stored and dried for 4 to 6 h until the repeated injection was molded. These processes were repeated seven times. The results revealed that the flexural strength of WPCs increased by about 5.26% from the original granules to the third injection cycle, but further increments in the number of cycles decreased the flexural strength. The tensile strength and tensile modulus of the WPC specimens increased until the third cycle of injection molding while they tended to decrease after the third injection cycle.

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Section: Introductionmentioning

confidence: 99%

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Kaymakçı¹,

Ayrılmış²

2016

BioResources

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“…It is known that even though manufacturing of plastic materials was stabilized at first, their reprocessing for use achieving required properties required stabilization. 8,11 On the other hand, the most of synthetic stabilizers decelerates the decomposition of the plastic waste. Using a polymeric natural antioxidant, which is nontoxic and compatible with the base polymer and could affect the degradation of the polyolefin matrix, can solve this problem.…”

Section: Introductionmentioning

confidence: 99%

Radical scavenging capacity of lignin and its effect on processing stabilization of virgin and recycled polypropylene

Gregorová

Košíková

Staško

2007

J of Applied Polymer Sci

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ABSTRACT:The radical scavenging capacity of lignin was determined using spectrophotometric method by means of scavenging of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH ) and compared with that of synthetic antioxidant Irganox 1010. Lignin reacted progressively with the DPPH reaching a steady state in 6 h, showing high antiradical activity with a stochiometry of 5.5 reduced DPPH molecules. Irganox 1010 showed lower antiradical activity reaching a steady state with DPPH after 13 h. Moreover, stabilization efficiency of lignin has been investigated in virgin and recycled polypropylene. The stabilization effect of lignin was evaluated by melt volume rate (MVR). The efficiency of lignin as processing stabilizer in both series polypropylene samples was compared with that of synthetic antioxidant Irganox 1010. The presence and behavior of free radicals in the lignin/polypropylene composites formed during processing was determined by electron paramagnetic resonance (EPR). It was observed that used lignin sample could stabilise both virgin and recycled polypropylene.

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“…This assumption was based on soxhlet extraction test performed on PP samples before recycling confirming definitely the persistence of carbonyl groups on the chain backbone of PP after the extraction procedure with xylene. In this connection, the literature [28,29] reported that aldehyde (1 725 cm À1 ), ketonic (1 715 cm À1 ), carboxylic (1 710 cm À1 ) and ester groups (1 745 cm À1 ) are the most frequent groups which are generated by oxidative degradation of polyolefins during processing. Moreover, these groups are generated by the b-chain scission of the alkoxy radicals.…”

Section: Resultsmentioning

confidence: 94%

“…The results suggest that the PP material should not be recycled more than one time. According to the literature, [17,[29][30][31] behavior is due to degradation by chain scission giving rise to a significant decrease in molecular weight and subsequently to lower viscosity. The combination of high temperature, shear and the presence of oxygen and chromophoric species such as hydroperoxides, carbonyl groups and catalyst residues in the polymer matrix, could be the main factors promoting degradation.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Effect of Reprocessing Cycles on the Morphology and Properties of Poly(propylene)/Wood Flour Composites Compatibilized with EBAGMA Terpolymer

Kaci

Hamma

Pillin

et al. 2009

Macro Materials & Eng

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The present study is aimed to investigate the effect of multiple extrusions of iPP/WF composites with and without EBAGMA used as compatibilizer. The degradation induced by the recycling processes was evaluated through changes in molecular structure, morphology, rheology, thermal and mechanical properties. The results showed that after six cycles, the presence of WF imparts stability to the composite materials. This effect was enhanced for the compatibilized samples. Further, SEM revealed better dispersion of the WF in the matrix. In contrast, it was confirmed that after the first recycling, both the molecular weight and the properties of PP drastically decreased due to chain scission resulting from degradation.magnified image

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Polypropylene compounding with post-consumer material

Cited by 52 publications

References 9 publications

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Radical scavenging capacity of lignin and its effect on processing stabilization of virgin and recycled polypropylene

Effect of Reprocessing Cycles on the Morphology and Properties of Poly(propylene)/Wood Flour Composites Compatibilized with EBAGMA Terpolymer

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