A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state
Abstract The investigation of chain branching in polypropylene (PP) holds significant importance for comprehending the impact of structural modifications on the properties of PP. The utilization of ethylene‐octene copolymer (EOC) presents a valuable opportunity to examine the influence of branching...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-04-01
|
| Series: | SPE Polymers |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/pls2.10115 |
| _version_ | 1797215131960082432 |
|---|---|
| author | Mohammadmahdi Negaresh Milad Karbalaei‐Bagher Yousef Jahani Ali Forouzan |
| author_facet | Mohammadmahdi Negaresh Milad Karbalaei‐Bagher Yousef Jahani Ali Forouzan |
| author_sort | Mohammadmahdi Negaresh |
| collection | DOAJ |
| description | Abstract The investigation of chain branching in polypropylene (PP) holds significant importance for comprehending the impact of structural modifications on the properties of PP. The utilization of ethylene‐octene copolymer (EOC) presents a valuable opportunity to examine the influence of branching density on the ability of electron beam irradiation or a chemical agent in a PP blend. The introducing long chain branches (LCB) into PP can enhance its mechanical properties, particularly impact strength. This characteristic is of particular significance in applications where the material is subjected to mechanical stress, such as automotive components or packaging materials. Blends of PP/EOC were produced using 20 and 30 wt% of EOC and 0.5 phr trimethylolpropane trimethacrylate (TMPTMA) monomer. To evaluate the efficiency of branching in both solid and molten states, irradiated samples and samples mixed with dicumyl peroxide (DCP) were selected. The rheological properties of the molten blends in shear and extensional modes were assessed, and their morphology was examined using scanning electron microscopy. The existence of LCB in all samples was confirmed through dynamic viscoelastic measurements. It was concluded that although the irradiation promoted chain scission within the backbone, which resulted in long chain branching, DCP created LCB on the backbone chains of PP through chemical reaction in the melt state. Additionally, the strain hardening constant (n) was calculated, and its value for the irradiated sample PP/EOC 80/20 was 0.19, whereas its value for this blend when employing DCP was 0.14. While the complex viscosity of irradiated blend (8764 Pa.s) was greater than that of melt state branched blend (8377 Pa.s) at 0.1 rad/s, in the higher frequencies it became smaller due to the more effective creation of long chain branches through peroxide grafting in the molten state. The results of the study verified the presence of LCB in the materials by observing longer relaxation time and strain hardening behavior. Highlights The chain branching of PP/EOC blends was investigated in both the melt state and solid state through the presence of TMPTMA monomer. The effectiveness of TMPTMA monomer in grafting was mostly notable in the molten state. The steady state viscosity of LCB‐(PP/EOC) was higher in the presence of dicumyl peroxide compared to irradiated PP/EOC. The samples containing 80 wt% of PP exhibited longer side branches compared to the sample with 70 wt% of PP according to shear and extensional rheometry. The induced side chain branches resulting from irradiation and the use of dicumyl peroxide help increase the miscibility of the polymers to a similar extent. |
| first_indexed | 2024-04-24T11:25:12Z |
| format | Article |
| id | doaj.art-005217a17f014d6eb5fa386e18a5437b |
| institution | Directory Open Access Journal |
| issn | 2690-3857 |
| language | English |
| last_indexed | 2024-04-24T11:25:12Z |
| publishDate | 2024-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | SPE Polymers |
| spelling | doaj.art-005217a17f014d6eb5fa386e18a5437b2024-04-10T17:21:14ZengWileySPE Polymers2690-38572024-04-015215116810.1002/pls2.10115A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid stateMohammadmahdi Negaresh0Milad Karbalaei‐Bagher1Yousef Jahani2Ali Forouzan3Department of Polymer Engineering and Color Technology Amirkabir University of Technology Tehran IranDepartment of Polymer Engineering and Color Technology Amirkabir University of Technology Tehran IranPlastic Department, Faculty of Processing Iran Polymer and Petrochemical Institute Tehran IranPlastic Department, Faculty of Processing Iran Polymer and Petrochemical Institute Tehran IranAbstract The investigation of chain branching in polypropylene (PP) holds significant importance for comprehending the impact of structural modifications on the properties of PP. The utilization of ethylene‐octene copolymer (EOC) presents a valuable opportunity to examine the influence of branching density on the ability of electron beam irradiation or a chemical agent in a PP blend. The introducing long chain branches (LCB) into PP can enhance its mechanical properties, particularly impact strength. This characteristic is of particular significance in applications where the material is subjected to mechanical stress, such as automotive components or packaging materials. Blends of PP/EOC were produced using 20 and 30 wt% of EOC and 0.5 phr trimethylolpropane trimethacrylate (TMPTMA) monomer. To evaluate the efficiency of branching in both solid and molten states, irradiated samples and samples mixed with dicumyl peroxide (DCP) were selected. The rheological properties of the molten blends in shear and extensional modes were assessed, and their morphology was examined using scanning electron microscopy. The existence of LCB in all samples was confirmed through dynamic viscoelastic measurements. It was concluded that although the irradiation promoted chain scission within the backbone, which resulted in long chain branching, DCP created LCB on the backbone chains of PP through chemical reaction in the melt state. Additionally, the strain hardening constant (n) was calculated, and its value for the irradiated sample PP/EOC 80/20 was 0.19, whereas its value for this blend when employing DCP was 0.14. While the complex viscosity of irradiated blend (8764 Pa.s) was greater than that of melt state branched blend (8377 Pa.s) at 0.1 rad/s, in the higher frequencies it became smaller due to the more effective creation of long chain branches through peroxide grafting in the molten state. The results of the study verified the presence of LCB in the materials by observing longer relaxation time and strain hardening behavior. Highlights The chain branching of PP/EOC blends was investigated in both the melt state and solid state through the presence of TMPTMA monomer. The effectiveness of TMPTMA monomer in grafting was mostly notable in the molten state. The steady state viscosity of LCB‐(PP/EOC) was higher in the presence of dicumyl peroxide compared to irradiated PP/EOC. The samples containing 80 wt% of PP exhibited longer side branches compared to the sample with 70 wt% of PP according to shear and extensional rheometry. The induced side chain branches resulting from irradiation and the use of dicumyl peroxide help increase the miscibility of the polymers to a similar extent.https://doi.org/10.1002/pls2.10115ethylene‐octene copolymerirradiationmultifunctional monomerperoxidepolypropylene |
| spellingShingle | Mohammadmahdi Negaresh Milad Karbalaei‐Bagher Yousef Jahani Ali Forouzan A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state SPE Polymers ethylene‐octene copolymer irradiation multifunctional monomer peroxide polypropylene |
| title | A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state |
| title_full | A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state |
| title_fullStr | A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state |
| title_full_unstemmed | A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state |
| title_short | A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state |
| title_sort | pragmatic approach to analyze the ability of ethylene octene copolymer in the long chain branching of polypropylene in molten and solid state |
| topic | ethylene‐octene copolymer irradiation multifunctional monomer peroxide polypropylene |
| url | https://doi.org/10.1002/pls2.10115 |
| work_keys_str_mv | AT mohammadmahdinegaresh apragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT miladkarbalaeibagher apragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT yousefjahani apragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT aliforouzan apragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT mohammadmahdinegaresh pragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT miladkarbalaeibagher pragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT yousefjahani pragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate AT aliforouzan pragmaticapproachtoanalyzetheabilityofethyleneoctenecopolymerinthelongchainbranchingofpolypropyleneinmoltenandsolidstate |