Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships
This study was dedicated to the blown film extrusion of poly(lactic acid), which mainly presents poor shear and elongation viscosities, and its blends. In order to enhance its melt strength, two main routes were selected (i) a structural modification through chain extension and branching mechanisms...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-05-01
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| Series: | Polymers |
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| Online Access: | http://www.mdpi.com/2073-4360/7/5/939 |
| _version_ | 1811298033042718720 |
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| author | Racha Al-Itry Khalid Lamnawar Abderrahim Maazouz |
| author_facet | Racha Al-Itry Khalid Lamnawar Abderrahim Maazouz |
| author_sort | Racha Al-Itry |
| collection | DOAJ |
| description | This study was dedicated to the blown film extrusion of poly(lactic acid), which mainly presents poor shear and elongation viscosities, and its blends. In order to enhance its melt strength, two main routes were selected (i) a structural modification through chain extension and branching mechanisms by adding a reactive multifunctional epoxide (named Joncryl) and (ii) blending with poly(butylene adipate-co-terephtalate), named PBAT in presence (or not) of Joncryl. The effects of the reactive agent on the shear and elongation rheology, morphological, and interfacial properties of the blends were systematically investigated. A decrease of the interfacial tension has been also demonstrated according to the deformed drop retraction method (DDRM). Hence, the role of Joncryl as a compatibilizer was highlighted. Consequently, finer morphology of the dispersed phase was obtained. Furthermore, the impact of the two modification routes on the blown film extrusion ability of PLA has been studied. Based on the improved shear and elongational rheological properties, a great enlargement of the blowing processing window of PLA modified with Joncryl was demonstrated. Indeed, with the addition of Joncryl into PLA–PBAT blends, a reduction of the instability defects has been detected. Finally, the induced crystalline structure and the thermo-mechanical properties of blown films were shown to be improved. |
| first_indexed | 2024-04-13T06:13:43Z |
| format | Article |
| id | doaj.art-b7db8367b768468b836a81c2bd3d8600 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-04-13T06:13:43Z |
| publishDate | 2015-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-b7db8367b768468b836a81c2bd3d86002022-12-22T02:58:55ZengMDPI AGPolymers2073-43602015-05-017593996210.3390/polym7050939polym7050939Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process RelationshipsRacha Al-Itry0Khalid Lamnawar1Abderrahim Maazouz2Institut National des Sciences Appliquées (INSA), Université de Lyon, Lyon F-69361, FranceInstitut National des Sciences Appliquées (INSA), Université de Lyon, Lyon F-69361, FranceInstitut National des Sciences Appliquées (INSA), Université de Lyon, Lyon F-69361, FranceThis study was dedicated to the blown film extrusion of poly(lactic acid), which mainly presents poor shear and elongation viscosities, and its blends. In order to enhance its melt strength, two main routes were selected (i) a structural modification through chain extension and branching mechanisms by adding a reactive multifunctional epoxide (named Joncryl) and (ii) blending with poly(butylene adipate-co-terephtalate), named PBAT in presence (or not) of Joncryl. The effects of the reactive agent on the shear and elongation rheology, morphological, and interfacial properties of the blends were systematically investigated. A decrease of the interfacial tension has been also demonstrated according to the deformed drop retraction method (DDRM). Hence, the role of Joncryl as a compatibilizer was highlighted. Consequently, finer morphology of the dispersed phase was obtained. Furthermore, the impact of the two modification routes on the blown film extrusion ability of PLA has been studied. Based on the improved shear and elongational rheological properties, a great enlargement of the blowing processing window of PLA modified with Joncryl was demonstrated. Indeed, with the addition of Joncryl into PLA–PBAT blends, a reduction of the instability defects has been detected. Finally, the induced crystalline structure and the thermo-mechanical properties of blown films were shown to be improved.http://www.mdpi.com/2073-4360/7/5/939biopolymersshear and elongation rheologystructural modificationblown film extrusioncrystallizationthermo-mechanical behavior |
| spellingShingle | Racha Al-Itry Khalid Lamnawar Abderrahim Maazouz Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships Polymers biopolymers shear and elongation rheology structural modification blown film extrusion crystallization thermo-mechanical behavior |
| title | Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships |
| title_full | Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships |
| title_fullStr | Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships |
| title_full_unstemmed | Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships |
| title_short | Biopolymer Blends Based on Poly (lactic acid): Shear and Elongation Rheology/Structure/Blowing Process Relationships |
| title_sort | biopolymer blends based on poly lactic acid shear and elongation rheology structure blowing process relationships |
| topic | biopolymers shear and elongation rheology structural modification blown film extrusion crystallization thermo-mechanical behavior |
| url | http://www.mdpi.com/2073-4360/7/5/939 |
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