Degradation of polypropylene impact-copolymer during processing

The effect of processing on molecular structure and properties of polypropylene impact-copolymer (ICPP) was investigated. It was confirmed that multiple extrusions induced changes in molecular weight resulting in increased MFI and decreased long-term thermooxidation stability. In terms of mechanical...

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Bibliographic Details
Published in:Polymer degradation and stability 2008-04, Vol.93 (4), p.770-775
Main Authors: Tocháček, Jiří, Jančář, Josef, Kalfus, Jan, Zbořilová, Petra, Buráň, Zdeněk
Format: Article
Language:English
Subjects:
Applied sciences
Crosslinking
Degradation
Exact sciences and technology
Extrusion moulding
Impact-copolymer
Machinery and processing
Moulding
Multiple extrusions
Plastics
Polymer industry, paints, wood
Polypropylene
Processing
Technology of polymers
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Summary:The effect of processing on molecular structure and properties of polypropylene impact-copolymer (ICPP) was investigated. It was confirmed that multiple extrusions induced changes in molecular weight resulting in increased MFI and decreased long-term thermooxidation stability. In terms of mechanical properties only impact strength well reflected the processing history. Tensile and flexural properties remained almost unchanged. The sizes of rubbery domains observed by SEM exhibited only minimum changes. The results of SSA and TREF techniques provided further data helping to elucidate the phenomena in rubbery phase. Based on indirect indications one could conclude that while typical polypropylene degradation resulting in chain backbone cleavage took place in the PP homopolymer phase, the rubbery phase containing EPR and PE homopolymer underwent a certain extent of crosslinking.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2008.01.027