Influence of Processing Conditions on Productivity, Thermal and Rheological Properties of Reprocessed Low Density Polyethylene
-
V. Pistor
Abstract
The market for recycled thermoplastic polymers is undergoing a sharp increase, although recyclate polymers are regarded as materials with inferior properties when compared to the virgin material. This study investigates the behavior of non-contaminated scraps of low density polyethylene (LDPE) from the plastic packaging industry after single processing stage, in terms of the productivity and the thermal and rheological properties. The LDPE used was reprocessed on a single-screw extruder (Miotto) of 90 mm screw diameter and L/D = 25. Three screw speeds (80, 90 and 100 min−1) were investigated at three processing temperatures (200, 250 and 300°C). The reprocessed materials were characterized by thermogravimetric analysis TGA, parallel plates rheometry and productivity. The results obtained by TGA showed a typical range of polyolefin degradation (350 to 450°C). The viscoelastic properties did not show significant changes in relation to the rheological behavior. Increasing the temperature and screw speed promoted a productivity gain of approximately 30%. This suggests that under the conditions studied it is possible to reprocess this material with good productivity ensuring its thermal, mechanical and rheological properties.
References
Azizi, H., et al., “Controlled-peroxide Degradation of Polyprolylene: Rheological Properties and Prediction of MWD from Rheological Data”, Polym. Test., 27, 548–554(2008), DOI: 10.1016/j.polymertesting.2008.02.004Suche in Google Scholar
Barnes, H. A., et al.: An Introduction to Rheology, Elsevier Science, Amsterdam(1989)Suche in Google Scholar
Brandrup, J., et al.: Recycling and Recovery of Plastics, Hanser Publishers, Munich(1996)Suche in Google Scholar
Corrêa da Silva, G. A., et al.: CBPol Proceedings, Foz do Iguaçu(2009)Suche in Google Scholar
Dal Castel, C., et al., “The Influence of Interfacial Agents on the Morphology and Viscoelasticity of PP/MMT Nanocomposites”, Mater. Sci. Eng. C, 29, 602–606(2009), DOI: 10.1016/j.msec.2008.10.012Suche in Google Scholar
Delgaldillo-Velázquez, O., et al., “Thermorheological Properties of LLDPE/LDPE Blends”, Rheol. Acta, 47, 19–31(2008), DOI: 10.1007/s00397-007-0193-8Suche in Google Scholar
Ferry, J. D.: Viscoelastic Properties of Polymers, John Wiley & Sons, New York(1980)Suche in Google Scholar
Hamid, S. H.: Handbook of Polymer Degradation, Marcel Dekker, New York(2000)10.1201/9781482270181Suche in Google Scholar
Harrison, D., “Olefin Polymerization Using Supported Metallocene Catalysts: Development of High Activity Catalysts for Use in Slurry and Gas Phase Ethylene Polymerizations”, J. Mol. Catal. A: Chem., 128, 65–77(1998), DOI: 10.1016/S1381-1169(97)00163-5Suche in Google Scholar
McLeish, T. C., “Polymer Architecture Influence on Rheology”, Curr. Opin. Solid State Mater. Sci., 2, 678–682(1997), DOI: 10.1016/S1359-0286(97)80009-5Suche in Google Scholar
Mpanza, H. S., Luyt, A. S., “Comparison of Different Waxes as Processing Agents for Low-Density Polyethylene”, Polym. Test., 25, 436–442(2006), DOI: 10.1016/j.polymertesting.2006.01.008Suche in Google Scholar
Peacock, A. J.: Handbook of Polyethylene: Structures, Properties and Applications, Marcel Dekker, New York (2000)10.1201/9781482295467Suche in Google Scholar
Pistor, V., et al., “Estudo do Reprocessamento de Polietileno de Baixa Densidade (PEBD) Reciclado do Processamento de Extrusão de Filmes Tubulares”, Polímeros: Ciência e Tecnologia, 20, 269–274(2010)Suche in Google Scholar
Pistor, V., et al., “Influence of Physical Interaction Between Organoclay and Poly(ethylene-co-vinyl acetate) Matrix and Effect of Clay Content on Rheological Melt State”, Polymer, 51, 5165–5171(2010), DOI: 10.1016/j.polymer.2010.08.045Suche in Google Scholar
Roths, T., et al., “A Generalized Regularization Method of Non-Linear Ill-Posed Problems Enhanced for Nonlinear Regularization Terms”, Comput. Phys. Commun., 139, 279–296(2001), DOI: 10.1016/S0010-4655(01)00217-XSuche in Google Scholar
Riande, E., et al.: Polymer Viscoelasticity: Stress and Strain in Practice, Marcel Dekker, New York(2000)10.1201/9781482293241Suche in Google Scholar
Scott, G., Chakraborty, K. B., “The Effects of Thermal Processing on the Thermal Oxidative and Photo-oxidative Stability of Low Density Polyethylene”, Eur. Polym. J., 13, 731–737(1977), DOI: 10.1016/0014-3057(77)90074-XSuche in Google Scholar
Shanina, E. L., Zaikov, G. E., “Antioxidant Consumption in a Stabilized LDPE-PP composition” Polym. Degrad. Stab., 151, 219–226(1996), DOI: 10.1016/0141-3910(95)00207-3Suche in Google Scholar
Shaw, M. T., MacKnight, W. J.: Introduction to Polymer Viscoelasticity, John Wiley & Sons, New York(2005), DOI: 10.1002/0471741833Suche in Google Scholar
Stromberg, E., Karlsson, S., “The Design of a Test Protocol to Model the Degradation of Polyolefins During Recycling and Sevice Life”, J. Appl. Polym. Sci., 112, 1835–1844(2009), DOI: 10.1002/app.29724Suche in Google Scholar
Ward, I. M., Hadley, D. W.: An Introduction to the Mechanical Properties of Solid Polymers, John Wiley & Sons, Hoboken(1993)Suche in Google Scholar
Weese, J., “A Regularization Method for Non-Linear Ill-posed Problems”, Comput. Phys. Commun., 77, 429–440(1993), DOI: 10.1016/0010-4655(93)90187-HSuche in Google Scholar
Witold, B., Corneliussen, R. D.: Failure of Plastics, Hanser Publishers, New York(1986)Suche in Google Scholar
Yamaguchi, M., Takahashi, M., “Rheological Properties of Low Density Polyethylenes Produced by Tubular and Vessel Processes”, Polymer, 42, 8663–8670(2001), DOI: 10.1016/S0032-3861(01)00449-9Suche in Google Scholar
Zahavich, A. T. P., et al., “Passes During Recycling of High Density Polyethylene”, Adv. Polym. Tech., 16, 1–24(1997), DOI: 10.1002/(SICI)1098-2329(199721)16:1<11::AID-ADV2>3.0.CO;2-MSuche in Google Scholar
© 2011, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Evaluation of Vacuum Venting for Micro-injection Molding
- Effect of Mechanical Milling on the Thermal Behavior of Polyethylene Reinforced with Nano-sized Alumina
- Preparation of Poly(acrylic acid)-Poly(ethylene oxide) Nanofibers via Electrospinning and Investigation of Their Morphology
- Concentration Effects of Organosilane (TESPD) on Mechanical Properties of Silica Filled Silicone Rubber/Natural Rubber Compounds
- Microcellular PP vs. Microcellular PP/MMT Nanocomposites: A Comparative Study of Their Mechanical Behavior
- Influence of Processing Conditions on Productivity, Thermal and Rheological Properties of Reprocessed Low Density Polyethylene
- Optimization of Dispersion of Nanosilica Particles in a PP Matrix and Their Effect on Foaming
- Paint/Polymer Interface Structure for ABS Injection Moldings
- Free Volume from Pressure and Temperature Dependent Viscosity and from PVT Measurements for Homo- and Copolymers
- Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers
- Rheological Modeling and Dynamic Characteristics of Disc Extruders
- The Effect of Polymer Additives on Surface Quality of Microcellular Injection Molded Parts
- Using Supercritical Carbon Dioxide for Physical Foaming of Advanced Polymer Materials
- Effect of Ionomer on Barrier and Mechanical Properties of PET/Organoclay Nanocomposites Prepared by Melt Compounding
- Rapid Communications
- Triangle Rule for Operating Windows and Scale-up Criteria for Volume Resistivity of PP/Carbon Nanotubes Composites
- Crystallization in Polymer Melts: Metamorphism of Flow Induced Nuclei
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Evaluation of Vacuum Venting for Micro-injection Molding
- Effect of Mechanical Milling on the Thermal Behavior of Polyethylene Reinforced with Nano-sized Alumina
- Preparation of Poly(acrylic acid)-Poly(ethylene oxide) Nanofibers via Electrospinning and Investigation of Their Morphology
- Concentration Effects of Organosilane (TESPD) on Mechanical Properties of Silica Filled Silicone Rubber/Natural Rubber Compounds
- Microcellular PP vs. Microcellular PP/MMT Nanocomposites: A Comparative Study of Their Mechanical Behavior
- Influence of Processing Conditions on Productivity, Thermal and Rheological Properties of Reprocessed Low Density Polyethylene
- Optimization of Dispersion of Nanosilica Particles in a PP Matrix and Their Effect on Foaming
- Paint/Polymer Interface Structure for ABS Injection Moldings
- Free Volume from Pressure and Temperature Dependent Viscosity and from PVT Measurements for Homo- and Copolymers
- Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers
- Rheological Modeling and Dynamic Characteristics of Disc Extruders
- The Effect of Polymer Additives on Surface Quality of Microcellular Injection Molded Parts
- Using Supercritical Carbon Dioxide for Physical Foaming of Advanced Polymer Materials
- Effect of Ionomer on Barrier and Mechanical Properties of PET/Organoclay Nanocomposites Prepared by Melt Compounding
- Rapid Communications
- Triangle Rule for Operating Windows and Scale-up Criteria for Volume Resistivity of PP/Carbon Nanotubes Composites
- Crystallization in Polymer Melts: Metamorphism of Flow Induced Nuclei
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
