A comparative study of UHMWPE fibers prepared by flash-spinning and gel-spinning

Quan

J of Applied Polymer Sci

et al. 2020

Interface variation in the extraction and drying process of ultra‐high molecular weight polyethylene (UHMWPE) gel fiber results in different shrinkage at different direction. The essence of shrinkage lies in the crystallization of UHMWPE chains under the effect of interface tension. However, UHMWPE gel fiber prepared with different solution concentration has different chain entanglement points density that can hinder the regular stacking for UHMWPE chains. The restriction for axis shrinkage of UHMWPE gel fiber facilitates the orientation of UHMWPE chains that is beneficial to improve the tensile strength of UHMWPE drawn fiber. Combined with multiple methods of Wide angle X‐ray diffraction, Small‐angle X‐ray scattering, Differential scanning calorimetry and sonic orientation, the structural evolution of UHMWPE fiber with different shrinkage ratio and different concentration was investigated. Meanwhile, the suitability for UHMWPE fibers in production was evaluated by final tensile strength of the fibers. Here, a structural evolution model is proposed to elucidate the correlation between the shrinkage and the structure and properties of UHMWPE fibers prepared with different solution concentration.

Section: Introductionmentioning

confidence: 99%

The effect of shrinkage on the structure and properties of ultra‐high molecular weight polyethylene fibers with different concentration

Quan

J of Applied Polymer Sci

et al. 2020

“…Epoxy is the most widely used thermoset matrix and most of the industries use epoxy for fabrication of composites due to their qualities like low processing temperature, thermal stability, adhesion, and hold good mechanical properties [4]. After conventional synthetic fibres like Glass fibre, Kevlar fibre, and Carbon fibre; UHMWPE fibres are most widely used as reinforcement in the recent days [5][6][7][8] because-of distinguished physical and mechanical properties UHMWPE fibres considered as third generation synthetic fibres [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Physical and Wear Properties of UHMWPE Fabric Reinforced Epoxy Composites

Prasad

Prakash²,

Manjunatha

et al. 2020

IJAME

Usage of synthetic fiber reinforced composites has increased rapidly because of their excellent properties such that it acts as a replacement for metals in the recent days. The physical and wear properties of Ultra-High Molecular Weight Polyethylene (UHMWPE) fabric reinforced epoxy composites have been studied in this present work. Using pin-on-disc test rig, dry-sliding wear of test specimens have been tested against disc of EN31 steel material. The plain woven bi-directional 200gsm and 240gsm UHMWPE fabric reinforced epoxy composites were fabricated by hand lay-up method at room temperature. All the tests were conducted as per the Taguchi’s L9 orthogonal-array. The process parameters considered in the present study is load, sliding velocity and sliding time with three levels each. Specific wear rate is considered as the response variable. Optimization is carried out to find best combination of parameters on specific wear rate. From the results, it is evident that load has greater influence on specific wear rate than other two considered parameters. Scanning Electron Microscopy (SEM) analysis was also carried out to examine the matrix distribution over fabric (reinforcement) and also their bonding between reinforcement and matrix.

Polymer Crystallization

“…Ultra‐high molecular weight polyethylene (UHMWPE) fibers were prepared by using the gel spinning method in industrial production, which endows UHMWPE fibers with excellent performance of high specific strength and modulus, high wear and cutting resistance, and energy absorption . So UHMWPE fibers can be widely utilized in high‐technology fields such as safety protection, national and military defense, and aerospace.…”

Section: Introductionmentioning

confidence: 99%

Formation and evolution of shish‐kebab structure during hot stretching in gel‐spun ultra‐high molecular weight polyethylene fibers with high concentration gel solution

et al. 2019

Formation and evolution of shish‐kebab crystals of gel‐spun ultra‐high molecular weight polyethylene fibers from high concentration gel solution during hot‐stretching process were studied by in situ small‐angle X‐ray scattering and wide‐angle X‐ray diffraction measurements, differential scanning calorimetry, and scanning electron microscopy. We show that the structural evolution process can be divided into three stages, namely, formation of shish‐kebab crystals (stage I), transition of shish‐kebab crystals (stage II), and further transition of fibrillar crystals (stage III). The formation and evolution of shish‐kebab crystals at low stretching temperature were mainly achieved via lamellar fragmentation and crystal slip, while those at high stretching temperature were achieved via stress‐induced melting recrystallization. Furthermore, low stretching temperature is not conducive to the formation and transformation of shish‐kebab crystals, and most of the fibrillar crystals form directly via lamellar fragmentation and crystal slip. However, the fibrillar crystals formed at high stretching temperature are better than those at low stretching temperature due to the partial chain disentanglement.