Strength Of Polyethylene Terephthalate Research Articles

Enhancing the Electrical Conductivity and Strength of PET by Single-Wall Carbon Nanotube Film Coating.

Single-wall carbon nanotubes (SWCNTs) with excellent physicochemical properties are considered a promising candidate for the electrical and mechanical reinforcements of polymers. However, the poor dispersion of SWCNTs in plastics seriously limits their application and their achieved performance enhancement. Here, we coat a freestanding, highly conductive SWCNT film onto the surface of a polyethylene terephthalate (PET) film by a hot-pressing method. Due to the uniform SWCNT network structure and strong interfacial interaction, the SWCNT/PET hybrid film showed notably enhanced electrical and mechanical properties even though with a very low SWCNT weight fraction of 0.066%. The surface square resistance of the SWCNT/PET film decreased to 120-140 Ω/□ from 1016 Ω. In addition, Young's modulus and tensile strength of the SWCNT/PET film reached 4.6 GPa and 148 MPa, which are 31.3 and 24.4%, respectively, higher than the pure PET film. The SWCNT/PET film shows excellent mechanical durability and thermal stability, demonstrating its potential use as an antistatic material.

Weld ability of dissimilar material of 304 stainless steel and polyethylene terephthalate

ABSTRACTGas tungsten arc welding was used to join dissimilar materials: 2-mm-thick plate of 304 stainless steel and 1.5-mm-thick polyethylene terephthalate (PET) plastic sheet. The joints of 30 mm in width possessed strong tensile shear loads of approximately 2.1 kN at the maximum and the tensile strength is 47.6 Mpa, which is almost the similar to shear load and tensile strength of the pure PET (the strength of PET is about 45 Mpa). The effect of main process parameters on the joint strength was investigated through experiments. It is found that appropriate amount of small bubbles is helpful to improve the strength of the joint. The infrared spectra analysis and energy-dispersive spectrometer results of the joints demonstrated that 304 and PET were bonded together through the reaction of carbonyl and metallic element in the joint, which lead to the, the chemical bond formation and the resulted in significantly improved joint strength.

The application of principal component analysis and gray relational method in the optimization of the melt spinning process using the cooling air system

This study attempted to optimize the manufacturing process of polyethylene terephthalate (PET) and titanium dioxide-containing (TiO2) composite fibers. The composite fiber is made by the melt spinning processing method, and has the characteristics of the high strength of PET and the sterilization function of TiO2. To obtain the optimal processing parameters, this study applied the Taguchi method in planning the research experiment, and set one parameter of two levels and seven parameters of three levels using the L18 orthogonal array. The flow equation was used to design a cooling air system for the manufacturing, and the results showed that using one parameter of two levels can give a stable air pressure to cool the fiber to obtain the characteristics of excellent quality. Finally, field emission scanning electron microscope (FE-SEM) was used to observe the distribution of TiO2 particles in the PET fiber produced in the experiment, in order to verify the experimental effectiveness. This study used principal component analysis combined with the gray relational method to obtain the optimal parameters of the experiment, because the former has the advantage of data simplicity, while the latter can determine the factors influencing power ranking. Confirmation experiments were conducted to test the quality characteristics, and found that the properties of the fiber produced with the optimal parameters showed improvements.

Mechanical strength of cold plasma treated PET fibers

In this work, the effects of cold plasma treatment on the mechanical strength of polyethyleneterephthalate (PET) fibers has been verified. Single fibers were treated with oxygen and a mixture of oxygen and tetrafluoroethylene in a cold plasma reactor for 30, 100 and 200 s. The single fibers were then tested in tensile mode and the mechanical strength was analyzed by using the Weibull distribution function.

Effect of ? radiation on the long-term strength of polyethylene terephthalate

By analyzing the results of a study of the long-term strength and isometric heating diagrams of polyethylene terephthalate exposed to γ radiation it has been established that irradiation leads to a decrease in the short-time and long-term strength of the polymer and to the misorientation of its structural elements. The coefficient γ in the long-term strength equation increases with the radiation dose, while U0 varies along a curve with a maximum at small doses.