Characterization and properties of recycled polypropylene (rPP)/ recycled high density polythylene (rHDPE) blends and its composites
The thermoplastic blends of recycled polypropylene (rPP) and recycled high density polyethylene (rHDPE) was studied. The rPP/rHDPE blends were prepared by using twin screw extruder at temperature 190⁰C and rotor speed of 180 rpm. The effect of blend ratio on tensile properties, morphology and therma...
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| Format: | Thesis |
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| Language: | English |
| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/77082/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/77082/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/77082/4/Siti%20Mariam%20Atiqah.pdf |
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| Summary: | The thermoplastic blends of recycled polypropylene (rPP) and recycled high density polyethylene (rHDPE) was studied. The rPP/rHDPE blends were prepared by using twin screw extruder at temperature 190⁰C and rotor speed of 180 rpm. The effect of blend ratio on tensile properties, morphology and thermal properties were investigated. It was found that the increasing in rHDPE content of rPP/rHDPE blends have decreased the tensile strength, modulus of elasticity but increased in the elongation at break. The
crystallinity and thermal stability of blends increased with increasing rHDPE content.
The morphology of rPP/rHDPE blends showed rHDPE was dispersed in the rPP
continuous phase with increasing rHDPE content. The compatibilizer, maleic anhydride
grafted polypropylene (MAPP) was used to enhance tensile properties of the blends. The
addition of MAPP has improved the tensile strength, modulus of elasticity, crystallinity
of blends and thermal stability but lower the elongation at break. The micrograph SEM of
tensile fracture surface of rPP/rHDPE blends with MAPP showed enhanced interfacial
interaction and adhesion between rPP and rHDPE due to the reduction of rHDE dispersed
phase. The addition of kaolin as filler has led to significant changes to the rPP/rHDPE
blends properties. At 10 php of kaolin content, the tensile strength and modulus of
elasticity showed optimum values. The incorporation of kaolin has increased the thermal
stability of rPP/rHDPE/kaolin composites and the crystallinity of rPP, and rHDPE
components was reduced. The water absorption of rPP/rHDPE/kaolin increased with
increasing kaolin content. The presence of MAPP in rPP/rHDPE/kaolin composites
exhibit higher tensile properties of the composites compared to composites without
MAPP. The composites with MAPP have better water resistance compared to composites
without MAPP. The crystallinity and thermal stability of composites with MAPP were
higher than composites without MAPP. The improvement of interfacial-interaction with
rPP/rHDPE and kaolin with the presence of MAPP was proven by SEM studied. |
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