The Influence of Processing Parametters on Polymorphism of Long Chain Branched Polypropylene
The result's identifiers
Result code in IS VaVaI
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Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
The Influence of Processing Parametters on Polymorphism of Long Chain Branched Polypropylene
Original language description
The influence of injection moulding processing parameters on structure of long-chain branched polypropylene (LCB-PP) Daploy WB130HMS supplied by Borealis Company Vienna, Austria was investigated. It is a propylene-based polymer that is produced by grafting monomer during radically controlled reactions of isotactic polypropylene with peroxides to form long chain branches. Examined material has the value of melt flow rate (230 °C, 2.16 kg, ISO 1133) of 2.1 g/10 min.Long-chain branched polypropylene was injection moulded using four sets of processing parameters. In the P-set holding pressure was varied within a range of 30–70 MPa by 10 MPa, in T-set mould temperature was precisely controlled – increased from 40 to 120 °C in 20 °C step, while in S-set1 and S-set2, respectively injection speed increased from 20 to 140 mm/s in 30 mm/s step and the mould was held at temperature of 40 or 120 °C. Other parameters remained unchanged: temperatures of heating zones 190; 220; 230 °C, melt temperature (nozzle) 240 °C and holding pressure time 60 s.The polymorphic composition of LCB-PP derived from wide-angle X-ray scattering showed a significant dependence on the processing technology and their parameters. Comparison of the morphology evolution through the injection-molded specimen cross-section brings an interesting observation – coexistence of α-, β- and γ- phases. The increase of holding pressure and mould temperature positively influenced the γ-phase content in both skin and core layers, in the case of mould temperature β-phase content increased as well. Higher injection speed leaded to increase of β-phase content, however, only in skin layer, independently on mould temperature.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů