Effect of Feeding Strategy on the Properties of PP/Recycled EPDM Blends

Abstract

In this work, thermoplastic elastomers (TPE) were produced based on polypropylene (PP) and recycled ethylene-propylene-diene monomer (r-EPDM) through twin-screw extrusion followed by injection molding. In particular, the effect of different feeding strategies (component introduction order and position along the screw) and r-EPDM content (0, 20, 35, 50 and 65 %w t.) were studied. From the materials produced, morphological and mechanical characterizations were carried out. The results show that feeding strategy has asubstantial influence on dispersion and compatibility between PP and r-EPDM. The main result is that r-EPDM can significantly increase PP impact strength (495 %) with optimized processing conditions.

The effect of polyester recycled tire fibers mixed with ground tire rubber on polyethylene composites. Part I

“…In the first part of this study, the effect of RTF addition mixed with GTR in LLDPE with and without SEBS-g-MA was investigated. Different contents (10,25, and 50 wt%) were used, while the coupling agent content was fixed (10 wt%) when added. To improve the interfacial adhesion between the components while reducing raw material costs, different processing conditions in extrusion compounding (screw speed of 110, 180, and 250 r min À1 ) and injection molding were applied at LT and HT profiles related to values below or above the melting point of RTF fibers (PET).…”

“…In general, used tires can be decomposed into three main components: ground tire rubber (GTR), recycled tire fiber (RTF), and steel. 2 Although several studies were published on the use of GTR in several polymer matrices such as polyethylene (PE) [6][7][8][9] and polypropylene (PP) [10][11][12][13][14] to increase some mechanical properties such as impact strength, there is very limited information available on the use of RTF as a filler/reinforcement to produce polymer composites. Although different materials are used as tire cords in the tire structure, 15 polyester (polyethylene terephthalate (PET)) is mainly used.…”

Effects of processing parameters on the properties of microwave‐devulcanized ground tire rubber/polyethylene dynamically revulcanized blends

“…Mahallati and Rodrigue observed the influence of feeding strategy on the mechanical properties of blends of PP/recycled ethylene‐propylene‐diene monomer (r‐EPDM). According to them, the location of the second feeder needed to be optimized to reach a good balance between dispersion and rubber particle treatment.…”

Ground tire rubber (GTR) surface modification using thiol-ene click reaction: Polystyrene grafting to modify a GTR/polystyrene (PS) blend

“…This recycled material can be blended with asphalt for road pavement applications 5 or with various polymers to produce thermoplastic elastomers. 6,7 They can also be used as impact modifiers, especially for polymer composites. 8,9 Unfortunately, raw GTR particles have limited adhesion to most polymers, leading to poor mechanical properties of the resulting composites, and therefore limited applications.…”