Peculiar crystallization and viscoelastic properties of polylactide/polytetrafluoroethylene composites induced by in-situ formed 3D nanofiber network

Jalali, Amirjalal; Kim, Jung Hyun; Zolali, Ali M.; Soltani, Iman; Nofar, Mohammadreza; Behzadfar, Ehsan; Park, Chul

doi:10.1016/j.compositesb.2020.108361

Cited by 41 publications

(12 citation statements)

References 73 publications

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“…Poly(lactic acid) (PLA) is one of the most common bioplastics used in packaging applications owing to its remarkable physical properties, processability, − and its ability to be biodegraded to nontoxic byproducts in a compost environment. , PLA provides an excellent structural backbone through its tensile strength as well as water barrier properties due to its hydrophobicity and crystallinity . However, the material has been proven to have poor gas barrier properties, calling for resolutions when used in packaging applications. , On the other hand, thermoplastic starch (TPS) is a promising compostable material that provides superior gas barrier properties due to its crystallinity. − The hydrophilic nature of TPS makes it challenging to integrate into a packaging solution on its own since the material degrades readily.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Layer Adhesion and Uniformity in Poly(lactic acid) and Thermoplastic Starch Multilayered Films

Higginson

Kolahchi

Behzadfar

2022

Ind. Eng. Chem. Res.

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Multilayered films of poly(lactic acid) (PLA) and thermoplastic starch (TPS) offer complementary characteristics that are promising for sustainable packaging applications. In this study, an in-house designed three-line coextrusion process was developed to fabricate layered films. These films were produced at varying shear rates and viscosity ratios with and without compatibilizers. Rheological and thermal analyses were used to investigate adhesion strength and uniformity. Results showed the processing shear rate has a significant effect up to 136% on adhesion strength, its maximum at 10.6 s −1 . Viscosity ratio, varied by plasticizer content in TPS, impacted adhesion strength up to 48% within the studied ranges, showing its maximum at 25 wt % added plasticizers. Results showed that 2.5 wt % of compatibilizer, maleic anhydride, within TPS increased adhesion strength up to 35%. Thermal analysis of layers at different locations along the cross-section revealed that the viscosity ratio had a defining impact on layer uniformity of TPS within PLA layers. This study highlights the importance of material and processing parameters in designing a biobased sustainable packaging solution.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Layer Adhesion and Uniformity in Poly(lactic acid) and Thermoplastic Starch Multilayered Films

Higginson

Kolahchi

Behzadfar

2022

Ind. Eng. Chem. Res.

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“…Specifically, one of the major lightweight technologies is utilizing fiber-reinforced plastics (FRP) material into industry for automotive or aerospace products [ 4 , 5 , 6 , 7 ], and for modern electric cars [ 8 ]. In addition, FRP also can be considered an eco-friendly material by using biocompatible polymer, but in reality, the amount is still small [ 9 ]. Hence, the global demand for carbon fibers (CF) and glass fibers (GF) to make FRP is increasing rapidly [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Parameter Sensitivity and the Physical Mechanism for the Formation of a Core-Skin-Core (CSC) Structure in Two-Stage Co-Injection Molding

Huang

Rao

et al. 2022

Polymers

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One of the main challenges in co-injection molding is how to predict the skin to core morphology accurately and then manage it properly, especially after skin material has been broken through. In this study, the formation of the Core-Skin-Core (CSC) structure and its physical mechanism in a two-stage co-injection molding has been studied based on the ASTM D638 TYPE V system by using both numerical simulation and experimental observation. Results showed that when the skin to core ratio is selected properly (say 30/70), the CSC structure can be observed clearly at central location for 30SFPP/30SFPP system. When the skin to core ratio and operation conditions are fixed, regardless of material arrangement (including 30SFPP/30SFPP; PP/PP; 30SFPP/PP; and PP/30SFPP systems), the morphologies of the CSC structures are very close for all systems. This CSC structure can be further validated by using μ-CT scan and image analysis technologies perfectly. Furthermore, the influences of various operation parameters on the CSC structure variation have been investigated. Results exhibited that the CSC structure does not change significantly irrespective of the flow rate changing, melt temperature varying, or even mold temperature being modified. Moreover, the mechanism to generate the CSC structure can be derived using the melt front movement of the numerical simulation. It is worth noting that after the skin material was broken through, the core material travelled ahead with fountain flow to occupy the flow front. In the same period, the proper amount of skin material with certain inertia of enough kinetic energy will keep going to penetrate the new coming core material to travel until the end of filling. It ends up with this special CSC structure.

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“…Blending with other polymers has been; however, considered as a practical cost‐effective approach to tailor the properties of PLA 25 . PLA could be blended with other polymers that have high toughness and ductility 26–28 while its melt properties and hence processability could also be improved 29–36 . In this context, thermoplastic polyurethane (TPU) with high ductility, toughness, and impact strength could be considered as an appropriate candidate to be blended with PLA as, due to its biocompatibility, the developed blend could also be used in biomedical applications 25 …”

Section: Introductionmentioning

confidence: 99%

Super toughened and highly ductile PLA/TPU blend systems by in situ reactive interfacial compatibilization using multifunctional epoxy‐based chain extender

Kahraman

Özdemir

Kılıç

et al. 2021

J of Applied Polymer Sci

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This study investigates the influence of using multifunctional epoxy Joncryl ADR 4468 chain extender (CE) on the properties of various polylactide (PLA)/thermoplastic polyurethane (TPU) (75 wt/25 wt) blend systems. The blends were based on two different TPU grades with ether‐ and ester‐based soft segment as the dispersed phase (i.e., TPUether and TPUester) and an amorphous and a semicrystalline PLA grades as the matrix (i.e., aPLA and scPLA). PLA appeared to be more compatible with the TPUester, which caused the enhancement of the impact strength and strain at break values of the blends more remarkably. The dynamic rheological experiments also confirmed that the CE revealed a better reactivity with TPUester than TPUether. This further enhanced the interfacial compatibility between the PLA and TPUester and thereby dramatically improved the impact strength and ductility of the PLA/TPUester blends, specifically those with 0.5 wt% CE. Meanwhile, aPLA as the matrix reflected the TPUs toughening effect more efficiently than scPLA. This was due to the possible shrinkage caused by the crystallization of scPLA matrix, which could deteriorate the interfacial interactions between the phases in the corresponding blends.

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Peculiar crystallization and viscoelastic properties of polylactide/polytetrafluoroethylene composites induced by in-situ formed 3D nanofiber network

Cited by 41 publications

References 73 publications

Evaluation of Layer Adhesion and Uniformity in Poly(lactic acid) and Thermoplastic Starch Multilayered Films

Evaluation of Layer Adhesion and Uniformity in Poly(lactic acid) and Thermoplastic Starch Multilayered Films

Investigation of Parameter Sensitivity and the Physical Mechanism for the Formation of a Core-Skin-Core (CSC) Structure in Two-Stage Co-Injection Molding

Super toughened and highly ductile PLA/TPU blend systems by in situ reactive interfacial compatibilization using multifunctional epoxy‐based chain extender

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