Effects of different types of polyethylene on the morphology and properties of recycled poly(ethylene terephthalate)/polyethylene compatibilized blends

Recycled poly(ethylene terephthalate) (R-PET) was blended with four types of polyethylene (PE), linear low density polyethylene (LLDPE; LL0209AA, Fs150), low density polyethylene (LDPE; F101-1), and metallocene-LLDPE (m-LLDPE; Fv203) by co-rotating twin-screw extruder. Maleic anhydride-grafted poly(styrene-ethylene/butyldiene-styrene) (SEBS-g-MA) was added as compatibilizer. R-PET/PE/SEBS-g-MA blends were examined by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), and mechanical property testing. The results indicated that the morphology and properties of the blends depended to a great extent on the miscibility between the olefin segments of SEBS-g-MA and PE. Due to the proper interaction between SEBS-g-MA and LDPE (F101-1), most SEBS-g-MA, located at the interface between two phases of PET and LDPE to increase the interfacial adhesion, lead to better mechanical properties of R-PET/LDPE (F101-1) blend. However, both the poor miscibility of SEBS-g-MA with LLDPE (LL0209AA) and the excessive miscibility of SEBS-g-MA with LLDPE (Fs150) and m-LLDPE (Fv203) reduced the compatibilization effect of SEBS-g-MA. DSC results showed that the interaction between SEBS-g-MA and PE obviously affected the crystallization of PET and PE. DMA results indicated that PE had more influence on the movement of SEBS-g-MA than PE did. Copyright © 2010 John Wiley & Sons, Ltd.

[1]  A. Hiltner,et al.  Effect of elastomer functionality on toughened PET , 1997 .

[2]  W. Guo,et al.  Influence of chain extension on the compatibilization and properties of recycled poly(ethylene terephthalate)/linear low density polyethylene blends , 2009 .

[3]  Weihong Guo,et al.  Structure and properties of compatibilized recycled poly(ethylene terephthalate)/linear low density polyethylene blends , 2007 .

[4]  Brian J. Tighe,et al.  A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies , 1998 .

[5]  K. Suh,et al.  Compatibilizing Effect of Isocyanate Functional Group on Polyethylene Terephthalate/Low Density Polyethylene Blends , 1998 .

[6]  Jason A Burdick,et al.  Review: photopolymerizable and degradable biomaterials for tissue engineering applications. , 2007, Tissue engineering.

[7]  C. Papaspyrides,et al.  Recycling of post-used PE packaging film using the restabilization technique , 2000 .

[8]  B. Boutevin,et al.  Reactive compatibilization of HDPE/PET blends by glycidyl methacrylate functionalized polyolefins , 1999 .

[9]  A. Galeski,et al.  Compatibilization and properties of poly(ethylene terephthalate)/polyethylene blends based on recycled materials , 2002 .

[10]  J. W. Barlow,et al.  Mechanical compatibilization of immiscible blends , 1984 .

[11]  A. Ghosh,et al.  Ionomer compatibilised PA6/EVA blends: mechanical properties and morphological characterisation , 2003 .

[12]  Weihong Guo,et al.  Thermal Properties and Morphology of Recycled Poly(ethylene terephthalate)/Maleic Anhydride Grafted Linear Low-Density Polyethylene Blends , 2008 .

[13]  C. Iniguez,et al.  Morphological stability of postconsumer PET/HDPE blends , 2000 .

[14]  N. Kalfoglou,et al.  Compatibility of blends of poly(ethylene terephthalate) with the ionomer of ethylene-methacrylic acid copolymer , 1994 .

[15]  S. Muñoz-Guerra,et al.  A review on the potential biodegradability of poly(ethylene terephthalate) , 1999 .

[16]  Maria Laura Mastellone,et al.  A life cycle assessment of mechanical and feedstock recycling options for management of plastic packaging wastes , 2005 .

[17]  T. Czigány,et al.  Development of composites with recycled PET matrix , 2006 .

[18]  G. Davis,et al.  Biodegradable packaging based on raw materials from crops and their impact on waste management , 2006 .

[19]  A. Hiltner,et al.  Toughening of polyester resins through blending with polyolefins , 1986 .

[20]  A. Dutta.  On viscosity — melt flow index relationship , 1984 .