| Preparation and Properties of Waste Rubber Powder/Polypropylene Blends |
| Received:June 18, 2020 Revised:June 18, 2020 |
| DOI：10.12136/j.issn.1000-890X.2021.03.0185 |
| Key Words: waste rubber powder；polypropylene；blend；compatibility；flow property；complex viscosity；storage modulus |
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| Abstract: |
| Abstract：The maleic anhydride grafted polypropylene 5076（MAH-g-5076） which was prepared by
melt grafting method could improve the interface compatibility between polypropylene and waste rubber
powder，and polypropylene MF650Y which had a high melt mass flow rate could improve the flow properties
of waste rubber powder/polypropylene blends. In this study，waste rubber powder/polypropylene blends with
high-performance and good processing properties were prepared by twin-screw extruder extrusion，and the
effect of the addition level of MF650Y on the properties of the blends was studied. The result showed that
with the increase of the addition level of MF650Y（total addition level of MF650Y and MAH-g-5076 was 30
phr），the tensile strength of the blends increased first and then decreased，it reached the maximum value when
the addition level of MF650Y was 5 ～ 10 phr，the elongation at break presented an oscillating decreasing
trend，and the melt mass flow rate increased. As the angular frequency increased，the complex viscosity
（η*） of the blends decreased，and the storage modulus（G′） and loss modulus tended to increase. When the
addition level of MF650Y was 5 phr，the η* and G′ of the blends were the largest. When the addition level of
MF650Y was 10 phr，it effectively helped to protect the carbon-carbon double bond and inhibited the crosslinking
reaction. At this time，the compatibility of polypropylene and waste rubber powder was better，the
bonding ability of the two-phase interface was stronger，and there was no obvious hole in the blends. |
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