Gel spinning of synthetic polymer fibres

Kuo, Chung‐Feng Jeffrey

doi:10.1533/9780857099174.2.100

Cited by 29 publications

(19 citation statements)

References 14 publications

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“…The entanglement phenomenon describes aggregates formed at cross-linking points in or between polymer chains, which leads to less mobile polymer chains. 34,35 These results indicate that the concentrated solution hinders polymer chain mobility and does not allow the polymer chains to penetrate the substrate pores to form a mechanically interlocking layer between the CMS layer and the substrate.…”

Section: Resultsmentioning

confidence: 99%

Insights into the Role of Polymer Conformation on the Cutoff Size of Carbon Molecular Sieving Membranes for Hydrogen Separation and Its Novel Pore Size Detection Technology

Lin

Tseng

et al. 2021

ACS Appl. Mater. Interfaces

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In this study, three polymer precursor conformations, dilute, semi-dilute, and concentrated, were used to fabricate carbon molecular sieving (CMS) membranes via a fixed carbonization protocol. The effects of the precursor conformation on the microstructure of the resultant CMS membranes were characterized by Raman analysis. Their ability to separate light gases, such as H2/CH4 and H2/N2, was assessed with a single-gas system. Additionally, a novel method was proposed to detect the cutoff size of the CMS membranes created in this study. The method combined high-resolution transmission electron microscopy (HR-TEM) and a focused ion beam (FIB) system. Finally, due to the semi-dilute solution’s denser polymer chains and lack of severe polymer entanglement, highly graphited CMS membranes with excellent gas separation performance were successfully synthesized using a semi-dilute polyetherimide dope solution. Interlayer distances in the carbon matrix were visualized and measured using our novel probing tool (HR-TEM and FIB) and software. The CMS membrane fabricated with a semi-dilute dope exhibited the best gas separation performance of the tested membranes. It had the most ordered carbon sheet orientation and exhibited a superior selectivity of H2/CH4 = 293 with a hydrogen permeability of 1138.7 Barrer, far surpassing the reported permselectivity of other membranes. We believe that the high H2/CH4 selectivity presented here is unprecedented for CMS membranes reported in the literature.

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Section: Resultsmentioning

confidence: 99%

Insights into the Role of Polymer Conformation on the Cutoff Size of Carbon Molecular Sieving Membranes for Hydrogen Separation and Its Novel Pore Size Detection Technology

Lin

Tseng

et al. 2021

ACS Appl. Mater. Interfaces

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“…As shown in Figure 9 and Table 4, the highest storage modulus at room temperature was observed for the UHMWPE/GNP film of 2.0 wt % GNP/PANI, showing a significant increase in stiffness. Good uniform distribution [31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46] and a strong interfacial interaction between a polymer matrix and a filler lead to an increase in the storage modulus of polymers. Also, in Figure 9, it can be seen that above the temperature of 100 °C, an increase in the storage modulus can be observed in all films (Figure 9, discontinuous lines).…”

Section: Resultsmentioning

confidence: 99%

“…UHMWPE has a very high melt viscosity, so that it is difficult to prepare UHMWPE xerogels with a good ability to multi-stage drawing by using the melt under extrusion technology. Therefore, the gel-spinning technology was used [34] in order to obtain high-strength materials based on UHMWPE. Previously, Maksimkin et al developed a new approach for fabricating bulk- oriented films based on UHMWPE by using a small amount of solvent as a plasticizer [35].…”

Section: Methodsmentioning

confidence: 99%

The Structure and Mechanical Properties of the UHMWPE Films Modified by the Mixture of Graphene Nanoplates with Polyaniline

et al. 2018

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Highly oriented UHMWPE films were reinforced with functionalized graphene nanoplates (GNP). GNP was functionalized by deposition of polyaniline (PANI) on the GNP surface. The structure of GNP/PANI was studied by Raman spectroscopy, and the structure of xerogels and films based on UHMWPE was studied by DSC and SEM. PANI promotes the reduction of the GNP aggregation in the UHMWPE matrix and increases the degree of crystallinity due to heterogeneous crystallization. The new lamellar crystal structure has a high drawability. The highest value of the tensile strength 1330 MPa (an increase of 45%) was obtained with a filler content of 2 wt % GNP/PANI, and the highest value of Young’s modulus 41 GPa (an increase of 32%) was obtained with a filler content of 1 wt % GNP/PANI. The effect of GNP with PANI fillers on the dynamic mechanical properties of the UHMWPE films was discussed.

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“…Several factors that influence the mechanical performance of gel-spun lignin-based fibers should be taken into consideration. For instance, polymer molecular weight [ 122 ], polymer concentration [ 127 ], and solvent removal [ 127 , 128 ] may affect fiber spinnability and fiber microstructure. Other factors such as the coagulation temperature, spinning dopes, coagulation solvent compositions, and fiber gelation time also impact the strength of gel-spun fibers [ 129 ].…”

Section: Mechanical Performance Of Lignin-based Fibersmentioning

confidence: 99%

Lignin-Based High-Performance Fibers by Textile Spinning Techniques

Lin

Cheng

2021

Materials

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As a major component of lignocellulosic biomass, lignin is one of the largest natural resources of biopolymers and, thus, an abundant and renewable raw material for products, such as high-performance fibers for industrial applications. Direct conversion of lignin has long been investigated, but the fiber spinning process for lignin is difficult and the obtained fibers exhibit unsatisfactory mechanical performance mainly due to the amorphous chemical structure, low molecular weight of lignin, and broad molecular weight distribution. Therefore, different textile spinning techniques, modifications of lignin, and incorporation of lignin into polymers have been and are being developed to increase lignin’s spinnability and compatibility with existing materials to yield fibers with better mechanical performance. This review presents the latest advances in the textile fabrication techniques, modified lignin-based high-performance fibers, and their potential in the enhancement of the mechanical performance.

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Gel spinning of synthetic polymer fibres

Cited by 29 publications

References 14 publications

Insights into the Role of Polymer Conformation on the Cutoff Size of Carbon Molecular Sieving Membranes for Hydrogen Separation and Its Novel Pore Size Detection Technology

Insights into the Role of Polymer Conformation on the Cutoff Size of Carbon Molecular Sieving Membranes for Hydrogen Separation and Its Novel Pore Size Detection Technology

The Structure and Mechanical Properties of the UHMWPE Films Modified by the Mixture of Graphene Nanoplates with Polyaniline

Lignin-Based High-Performance Fibers by Textile Spinning Techniques

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