Abstract
A high modulus of elasticity is a distinctive feature of carbon fibres produced from mesophase pitch. In this work, we expand our previous study of pitch/linear low-density polyethylene blend fibres, increasing the concentration of the linear low-density polyethylene in the blend into the range of from 30 to 90 wt%. A scanning electron microscope study showed two distinct phases in the fibres: one linear low-density polyethylene, and the other pitch fibre. Unique morphologies of the blend were observed. They ranged from continuous microfibres of pitch embedded in linear low-density polyethylene (occurring at high concentrations of pitch) to a discontinuous region showing the presence of spherical pitch nodules (at high concentrations of linear low-density polyethylene). The corresponding mechanical properties—such as tensile strength, tensile modulus, and strain at failure—of different concentrations of linear low-density polyethylene in the pitch fibre were measured and are reported here. Thermogravimetric analysis was used to investigate how the increased linear low-density polyethylene content affected the thermal stability of linear low-density polyethylene/pitch fibres. It is shown that selecting appropriate linear low-density polyethylene concentrations is required, depending on the requirement of thermal stability and mechanical properties of the fibres. Our study offers new and useful guidance to the scientific community to help select the appropriate combinations of linear low-density polyethylene/pitch blend concentrations based on the required mechanical property and thermal stability of the fibres.
Highlights
There is an increasing need for polymer materials with improved properties to meet modern requirements since no single polymer has all desired properties [1]
MPa)at and minimum (MPa) strain (30%), occurred with an LLDPE content of 30 wt%, while the maximum tensile strength (36.97 MPa) and maximum strain (68%) occurred with an LLDPE content of LLDPE (50 wt%)/MP As in our previous paper [39], we identified being brittle with low strain to failure, and the pitch fibre samples demonstrated such brittle behaviour
This paper shows how the concentration of LLDPE affects the morphology and physical properties of LLDPE/MP blend fibres over the range of between 30 and 90 wt%
Summary
There is an increasing need for polymer materials with improved properties to meet modern requirements since no single polymer has all desired properties [1]. Most polymer blends are prepared by melting [2] and polymer blending, with the fibres produced by a melt compound extruder This is an economic and useful method of manufacturing new materials with advantageous properties [3,4,5,6,7]. Electrical, and thermal features, CFs are extensively employed in numerous applications, ranging from space exploration to healthcare. Their industrial application would greatly increase if they could be manufactured at a significantly lower cost with improved mechanical characteristics [11]. MP-based carbon fibre (MPCF) is one material that appears very promising due to how the mesophase appears [12,13]
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