Melt spinning and characterization of hollow fibers from poly(4‐methyl‐1‐pentene)

Abstract

In this article, the melt spinning behavior of poly(4-methyl-1-pentene) (PMP) hollow fibers (HF) is examined. The melt spinning trials are carried out on a pilot scale melt spinning plant with different settings while a 10-hole 2cshaped spinneret is used. It is found that the winding speed mainly affects the outer fiber diameter. The influence of different melt spinning parameters is investigated, in particular temperatures, take-up velocities, and the use of quench air. For this purpose, the shape and crystalline structure of the fibers are analyzed using a light microscope, a scanning electron microscope, and wide-angle X-ray scattering. The shape of the fibers is mainly influenced by the temperature settings in the melt spinning process. As a reasonable lower limit, a melt spinning temperature of 280 C is identified. Concerning the crystallinity, a saturation going along with a slight reduction of the polymer chain orientation is observed at elevated take-up velocities.

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

“…Green fabrication can be achieved by involving less solvent and energy usage and safe and simple procedures. The techniques that satisfied said characteristics are MS-S [ 651 , 652 ] and ultraviolet (UV)-assisted melt electrospinning [ 653 ]. In the melt spinning process, a mixture of polymers is melted and spun by stretching force in a twin-screw extruder ( Figure 19 a).…”

Designing 3D Membrane Modules for Gas Separation Based on Hollow Fibers from Poly(4-methyl-1-pentene)

“…In fact, the actual results of the fundamental research in chemical engineering have led to a wide range of practical applications. This work focuses on the development of new membrane modules based on 3D structured HFs obtained by reagent-free technologies [12]. In particular, 3D membrane structures based on PMP HFs are suggested to improve the characteristics of HF membrane modules by increasing mass transfer on the shell side due to the regular distribution of HFs and creation of flow mixing, and avoiding the problem of channeling.…”

“…The T g of the obtained HFs was found to be 21 spinning process with a four-capillary core-shell spinneret and supporting air in the core using a laboratory-scale plant from Fourné Polymertechnik GmbH (Alfter, Germany). The preparation details of the HFs are given in [12]. Air was introduced in order to prevent the fibers from collapsing after extrusion, when the melt strength beyond the capillaries is not yet strong enough.…”

“…Unlike most polymer membranes produced with organic solvents, membranes based on poly(4-methyl-1-pentene) (PMP) can be obtained by the melt spinning method without using organic solvents [12]. Thermoplastic PMP is a semicrystalline aliphatic polyolefin, with a glass transition temperature T g of 20-30 • C and a melting temperature T m of 230 • C. It has the lowest density compared to all other thermoplastic materials (0.83 g/cm 3 ) [13].…”

Synthesis of SnO2/TiO2 micro belt fibers from polymer composite precursors and their applications in Li‐ion batteries*

“…For example, porous, hollow, and tubular are features of the different structures that have been achieved through nanocomposite production methods, which include centrifugal spinning, melt blowing, and electrospinning. [1][2][3][4][5][6][7] Due to the distinct characteristics and high surface area, nanocomposites have demonstrated improved performance in a wide variety of applications compared to their bulk counterpart. [8][9][10] Due to their semiconductive, photolytic, and electrochemical characteristics, SnO 2 /TiO 2 composites are among the most popular metal oxides that have been studied in the fields of energy storage, chemical sensing, as well as in biomedical applications.…”