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Recent advances on reactive Extrusion of Poly(lactic acid). Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Role of Maleic Anhydride-Grafted Poly(lactic acid) in Improving Shape Memory Properties of Thermoresponsive Poly(ethylene glycol) and Poly(lactic acid) Blends. Polymers (Basel) 2022; 14:polym14183923. [PMID: 36146067 PMCID: PMC9502679 DOI: 10.3390/polym14183923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 08/27/2022] [Accepted: 09/10/2022] [Indexed: 12/26/2022] Open
Abstract
Generally, poly(ethylene glycol) (PEG) is added to poly(lactic acid) (PLA) to reduce brittleness and improve mechanical properties. However, shape memory properties of PEG/PLA blends suffered due to the blend’s incompatibility. To enhance shape memory abilities of the blends, 0.45% maleic anhydride-grafted poly(lactic acid) (PLA-g-MA) was used as a compatibilizer. Thermal and mechanical properties, morphologies, microstructures, and shape memory properties of the blends containing different PLA-g-MA contents were investigated. The compatibilized blend with 2 wt% PLA-g-MA exhibited enhanced tensile modulus, strength, and elongation at break, as well as a lower glass transition temperature and degree of crystallinity than the uncompatibilized blend. Results revealed that PLA-g-MA improved interfacial adhesion between phases and promoted chain entanglement. Shape fixity performance of the compatibilized blends were comparable to that of neat PLA. The compatibilized blend containing 2 wt% PLA-g-MA possessed the best shape fixity and recovery performance. Although a high recovery temperature was expected to enhance the recovery of the PEG/PLA blends, the compatibilized blends can be recovered to their original shape at a lower temperature than the PLA. This study illustrated the possibility of optimizing PLA properties to meet requirements necessary for biomedical applications.
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Klute M, Piontek A, Heim HP, Kabasci S. Effects of blending poly(lactic acid) and thermoplastic polyester polyurethanes on the mechanical and adhesive properties in two-component injection molding. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2021-4212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
One possible way to increase the use of bioplastics and thus contribute to a more resource-efficient and sustainable economy is to broaden the application range of such bioplastics. Poly(lactic acid) (PLA) is a promising and commercially available bio-based and biologically degradable polymer, which exhibits a high strength and stiffness but is very brittle. Blending with other polymers can lead to an enhancement of the ductility of the PLA. The goal of this work was to show that blending of PLA with a bio-based thermoplastic polyester-urethane elastomer (TPU) increases the ductility of the compound and also affects the adhesion of the layers when the materials – the modified PLA compound and the TPU – are processed via two-component (2C) injection molding to form corresponding composite parts. The results show that both goals – the increased ductility as well as the increased adhesion between the polymeric phases in 2C parts – can be reached by compounding PLA with two different bio-based polyester-based TPUs. Tensile strength and Young’s modulus of the compounds decrease according to a linear mixing rule with the addition of TPU. Elongation at break and notched Charpy impact strength increase by 750 and 200%, respectively. By addition of the TPU, the surface free energies of the compounds were increased, especially the polar parts. This led to reduced interfacial tensions between the produced compounds and the neat TPUs and thus increased the adhesion between them. For the softer TPU the adhesion was so strong that the TPU showed a cohesive failure in the 90° peel test and thus could not be separated from the compound substrate at all. For the harder TPU the bonding strength increased by 140% upon the addition of this TPU inside the hard component.
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Affiliation(s)
- Marco Klute
- University of Kassel, Institute of Material Engineering–Polymer Engineering , Mönchebergstr. 3, 34125 Kassel , Germany
| | - Alexander Piontek
- Fraunhofer UMSICHT, Institute for Environmental , Safety and Energy Technology, Osterfelder Str. 3, 46047 Oberhausen , Germany
| | - Hans-Peter Heim
- University of Kassel, Institute of Material Engineering–Polymer Engineering , Mönchebergstr. 3, 34125 Kassel , Germany
| | - Stephan Kabasci
- Fraunhofer UMSICHT, Institute for Environmental , Safety and Energy Technology, Osterfelder Str. 3, 46047 Oberhausen , Germany
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Song L, Li Y, Meng X, Wang T, Shi Y, Wang Y, Shi S, Liu LZ. Crystallization, Structure and Significantly Improved Mechanical Properties of PLA/PPC Blends Compatibilized with PLA-PPC Copolymers Produced by Reactions Initiated with TBT or TDI. Polymers (Basel) 2021; 13:polym13193245. [PMID: 34641060 PMCID: PMC8512864 DOI: 10.3390/polym13193245] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 11/16/2022] Open
Abstract
Poly (lactic acid) (PLA)-Poly (propylene carbonate) (PPC) block copolymer compatibilizers are produced in incompatible 70wt%PLA/PPC blend by initiating transesterification with addition of 1% of tetra butyl titanate (TBT) or by chain extension with addition of 2% of 2,4-toluene diisocyanate (TDI). The above blends can have much better mechanical properties than the blend without TBT and TDI. The elongation at break is dramatically larger (114% with 2% of TDI and 60% with 1% of TBT) than the blend without TDI and TBT, with a slightly lower mechanical strength. A small fraction of the copolymer is likely formed in the PLA/PPC blend with addition of TBT, and a significant amount of the copolymer can be made with addition of TDI. The copolymer produced with TDI has PPC as a major content (~70 wt%) and forms a miscible interphase with its own Tg. The crystallinity of the blend with TDI is significantly lower than the blend without TDI, as the PLA blocks of the copolymer in the interphase is hardly to crystallize. The average molecular weight increases significantly with addition of TDI, likely compensating the lower mechanical strength due to lower crystallinity. Material degradation can occur with addition of TBT, but it is very limited with 1% of TBT. However, compared with the blends without TBT, the PLA crystallinity of the blend with 1%TBT increases sharply during the cooling process, which likely compensates the loss of mechanical strength due to the slightly material degradation. The added TDI does not have any significant impact on PLA lamellar packing, but the addition of TBT can make PLA lamellar packing much less ordered, presumably resulted from much smaller PPC domains formed in the blend due to better compatibility.
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Affiliation(s)
- Lixin Song
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
- Shenyang Advanced Coating Material Industry Technology Research Institute Co., Ltd., Shenyang 110326, China;
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yongchao Li
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Xiangyu Meng
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Ting Wang
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Ying Shi
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
| | - Yuanxia Wang
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
| | - Shengnan Shi
- Shenyang Advanced Coating Material Industry Technology Research Institute Co., Ltd., Shenyang 110326, China;
| | - Li-Zhi Liu
- Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China; (L.S.); (Y.L.); (X.M.); (T.W.); (Y.S.); (Y.W.)
- Correspondence:
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Burkov A, Kraev A, Grishin M, Vesnin R, Fomin S, Iordanskii A. Structural Features and Properties' Characterization of Polylactic Acid/Natural Rubber Blends with Epoxidized Soybean Oil. Polymers (Basel) 2021; 13:1101. [PMID: 33808356 PMCID: PMC8037271 DOI: 10.3390/polym13071101] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/25/2021] [Accepted: 03/26/2021] [Indexed: 11/16/2022] Open
Abstract
Because of the effort to preserve petroleum resources and promote the development of eco-friendly materials, bio-based polymers produced from sustainable resources have attracted great attention. Among them, polylactide (PLA) and natural rubber (NR) present prominent polymers with unique barrier and mechanical features. A series of samples with improved phase compatibility were obtained by blending PLA and NR using a double-rotor mixer. A plasticizing and enhancing effect on the polymers' compatibility was achieved by using epoxidized soybean oil (ESO) as a natural plasticizer and compatibilizer. ESO compounding in the PLA-NR blends increased the mobility of the biopolymer's molecular chains and improved the thermal stability of the novel material. The size of the NR domains embedded in the continuous PLA matrix decreased with the ESO content increment. The combination of thermal analysis and scanning electron microscopy enabled the authors to determine the features of potential packaging material and the optimal content of PLA-NR-ESO for the best mechanical properties.
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Affiliation(s)
- Andrey Burkov
- Department Chemistry and Technology Polymer Processing, Vyatka State University, 610000 Kirov, Russia; (A.K.); (R.V.); (S.F.)
| | - Alexander Kraev
- Department Chemistry and Technology Polymer Processing, Vyatka State University, 610000 Kirov, Russia; (A.K.); (R.V.); (S.F.)
| | - Maxim Grishin
- Semenov Institute of Chemical Physics, 119991 Moscow, Russia; (M.G.); (A.I.)
| | - Roman Vesnin
- Department Chemistry and Technology Polymer Processing, Vyatka State University, 610000 Kirov, Russia; (A.K.); (R.V.); (S.F.)
| | - Sergey Fomin
- Department Chemistry and Technology Polymer Processing, Vyatka State University, 610000 Kirov, Russia; (A.K.); (R.V.); (S.F.)
| | - Alexey Iordanskii
- Semenov Institute of Chemical Physics, 119991 Moscow, Russia; (M.G.); (A.I.)
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Karbalaei‐Bagher M, Ahmadi Z, Nazockdast H. A modus operandi toward interfacial enhancement of ethylene propylene diene monomer rubber/ polybenzoxazine blends using
EPDM‐
grafted
‐
vinyltrimethoxysilane copolymer. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25625] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Milad Karbalaei‐Bagher
- Department of Polymer Engineering and Color Technology Amirkabir University of Technology Mahshahr Iran
| | - Zahed Ahmadi
- Department of Chemistry Amirkabir University of Technology Tehran Iran
| | - Hossein Nazockdast
- Department of Polymer Engineering and Color Technology Amirkabir University of Technology Tehran Iran
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