Rheological rationalization of in situ nanofibrillar structure development: Tailoring of nanohybrid shish-kebab superstructures of poly (lactic acid) crystalline phase

Shahnooshi, Mahboobeh; Javadi, Azizeh; Nazockdast, Hossein; Ottermann, Katharina; Altstädt, Volker

doi:10.1016/j.polymer.2020.123040

Cited by 8 publications

(3 citation statements)

References 90 publications

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“…Moreover, dendritic microfibers appear when the PVC content is 39 wt.%, the microfibers are bifurcated and overlapped with gaps, and the adhesion between the microfibers maintains the basic shape of the membrane. Microfibril is the most notable feature of the flat membrane with DIP, which is formed by the blending and stretching processes of the PP and PVC [ 37 , 38 , 39 , 40 ]. Microfibrillation usually occurs during the melt blending and orientation of incompatible two-phase polymers [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Polypropylene Hollow Fiber Membrane by Dissolution-Inducing Pore Methods

Qiu

2022

Membranes

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Plasma leakage limits the development of polypropylene membranes as oxygenated membranes. Here, a new method named the dissolution-induced pore method was adapted to prepare polypropylene hollow fiber membranes: after polypropylene and polyvinyl chloride were melt-blended and extruded, the polyvinyl chloride was removed by N, N-dimethylacetamide to obtain a porous polypropylene membrane material. The variation of membranes has been explored in detail with respect to the influence of different parameters on the flux and mechanical properties of membranes and the feasibility of the polyvinyl chloride recovery. The resulting polypropylene hollow fiber membrane shows that plasma penetration was zero within 6 h of test, gas flux can reach 189,000 L/(m2·h·0.1 MPa), and its strength at break reaches 65 MPa and the elongation at break is 890%; polyvinyl chloride recovery achieves more than 99%. This research has developed a promising and low-cost extracorporeal membrane oxygenation material, which provides benefits for patients with less capacity for medical expenditure.

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Section: Resultsmentioning

confidence: 99%

Polypropylene Hollow Fiber Membrane by Dissolution-Inducing Pore Methods

Qiu

2022

Membranes

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“…Several new‐type polymer processing techniques, including slit die extrusion‐hot stretching‐quenching (SDEHSQ), 8–11 oscillation shear injection molding (OSIM), 12–14 multistage stretching extrusion (MSE), 15–19 and loop oscillating push‐pull molding (LOPPM), 20–23 have successfully produced in‐situ fibrillation reinforced composites. The reported literature showed that the existence of a fibrillated phase in in‐situ composites not only endows higher specific interfacial area but also plays a heterogeneous nucleation effect to induce the formation of hybrid shish‐kebab superstructure 13,18,21,23–26 . For example, Zhou et al 13 employed OSIM machine to provide intense shear flow, by which the dispersed phase of poly(butylene adipate‐co‐terephthalate) (PBAT) in‐situ forms into nanofibrils.…”

Section: Introductionmentioning

confidence: 99%

“…The reported literature showed that the existence of a fibrillated phase in in-situ composites not only endows higher specific interfacial area but also plays a heterogeneous nucleation effect to induce the formation of hybrid shish-kebab superstructure. 13,18,21,[23][24][25][26] For example, Zhou et al 13 employed OSIM machine to provide intense shear flow, by which the dispersed phase of poly(butylene adipate-co-terephthalate) (PBAT) in-situ forms into nanofibrils. With the assistance of PBAT nanofibrils and intense shear flow, abundant hybrid shish-kebabs superstructure anchoring ordered PLA kebabs were obtained in PLA/PBAT blends, which synchronously boosted the strength and toughness of PLA to a large extent.…”

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confidence: 99%

In‐situ generation of biodegradable poly(lactic acid)/poly(butylene succinate) nanofibrillar composites via a facile and cost‐effective strategy of pressure‐induced flow processing

Shen

et al. 2023

Polymers for Advanced Techs

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Inspired by the fact that the in‐situ fibrillation structure can enhance the polymer's macroscopic mechanical performance, a facile and cost‐effective strategy based on the pressure‐induced flow (PIF) processing was developed to produce ultra‐strong and super‐tough biodegradable poly(lactic acid)/poly(butylene succinate) (PLA/PBS) blends. Under the action of external pressure field, the ductile and flexible PBS droplets deformed along the flow direction (FD) and shifted from spheroid to ellipsoid, eventually to nanofiber as the compression ratio (CR) increased. From the scanning electron microscopy (SEM) results, it was found that the PBS droplets did not in‐situ take shape into nanofibrils until the CR reached to 4, and the PBS nanofibrils served as the central shish to induce the PLA molecular chain to crystallize in the perpendicular direction, resulting in nanohybrid shish‐kebab superstructures. The Raman spectra and differential scanning calorimetry results confirmed the enhancement effect of the CR on the orientation degree, lamellar thickness, and crystallization properties. Benefiting from the abundant interlocked hybrid shish‐kebabs, the tensile strength, tensile modulus, and impact strength of the PIF processing PLA/PBS blend (CR = 4) reached the maximum value of 106.4 MPa, 2332.4 MPa, and 87.4 kJ/m2, respectively, which were 116.7%, 40.1%, and 20.8‐folds higher than those of the common PLA/PBS blend. Overall, it is believed that the proposed methodology put forward a facile and cost‐effective way to produce PLA‐based in‐situ fibrillation reinforced composites for engineering applications.

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Mechanically Robust Polylactide Fibers with Super Heat Resistance via Constructing in situ Nanofibrils

Zhao

et al. 2022

Chin J Polym Sci

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Rheological rationalization of in situ nanofibrillar structure development: Tailoring of nanohybrid shish-kebab superstructures of poly (lactic acid) crystalline phase

Cited by 8 publications

References 90 publications

Polypropylene Hollow Fiber Membrane by Dissolution-Inducing Pore Methods

Polypropylene Hollow Fiber Membrane by Dissolution-Inducing Pore Methods

In‐situ generation of biodegradable poly(lactic acid)/poly(butylene succinate) nanofibrillar composites via a facile and cost‐effective strategy of pressure‐induced flow processing

Mechanically Robust Polylactide Fibers with Super Heat Resistance via Constructing in situ Nanofibrils

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