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Phase structure and properties of poly(ethylene terephthalate)/high-density polyethylene based on recycled materials

Authors

  • Yong Lei,

    Corresponding author
    1. School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803
    • School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803
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  • Qinglin Wu,

    Corresponding author
    1. School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803
    • School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803
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  • Craig M. Clemons,

    1. Performance Engineered Composites, USDA Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, Wisconsin 53705-2398
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  • Weihong Guo

    1. Polymer Alloy Laboratory, Department of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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Abstract

Blends based on recycled high density polyethylene (R-HDPE) and recycled poly(ethylene terephthalate) (R-PET) were made through reactive extrusion. The effects of maleated polyethylene (PE-g-MA), triblock copolymer of styrene and ethylene/butylene (SEBS), and 4,4′-methylenedi(phenyl isocyanate) (MDI) on blend properties were studied. The 2% PE-g-MA improved the compatibility of R-HDPE and R-PET in all blends toughened by SEBS. For the R-HDPE/R-PET (70/30 w/w) blend toughened by SEBS, the dispersed PET domain size was significantly reduced with use of 2% PE-g-MA, and the impact strength of the resultant blend doubled. For blends with R-PET matrix, all strengths were improved by adding MDI through extending the PET molecular chains. The crystalline behaviors of R-HDPE and R-PET in one-phase rich systems influenced each other. The addition of PE-g-MA and SEBS consistently reduced the crystalline level (χc) of either the R-PET or the R-HDPE phase and lowered the crystallization peak temperature (Tc) of R-PET. Further addition of MDI did not influence R-HDPE crystallization behavior but lowered the χc of R-PET in R-PET rich blends. The thermal stability of R-HDPE/R-PET 70/30 and 50/50 (w/w) blends were improved by chain-extension when 0.5% MDI was added. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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