Rheology, Non-Isothermal Crystallization Behavior, Mechanical and Thermal Properties of PMMA-Modified Carbon Fiber-Reinforced Poly(Ethylene Terephthalate) Composites

Abstract

Poly(ethylene terephthalate) (PET) composites containing carbon fiber (CF) or polymethyl methacrylate (PMMA)-grafted carbon fiber (PMMA-g-CF) were prepared by melt compounding. The rheology, non-isothermal crystallization behavior, and mechanical and thermal properties of pure PET, PET/CF and PET/PMMA-g-CF composites were investigated. The results show that the addition of CF or PMMA-g-CF significantly increases the storage modulus (G′), loss modulus (G″), and complex viscosity (η*) of the composites at low frequency. The Cole-Cole plots confirm that the surface modification of CF leads to a better interaction between the CF and PET, and then decreases the heterogeneity of the polymeric systems, which is confirmed by the SEM observation on the tensile fracture surface of the composites. Non-isothermal crystallization analysis shows that the CF or PMMA-g-CF could serve as nucleation agent to accelerate the crystallization rate of the composites, and the effect of PMMA-g-CF is stronger than that of CF. The result is further confirmed by the analysis of the crystallization activation energy for all composites calculated by the Flynn-Wall-Ozawa method. Moreover, the tensile and impact strength and the thermal stability of the composites are improved by CF, while the incorporation of PMMA-g-CF further enhances the tensile and impact strength and thermal stability.

Integrating Nano-Cu2O@ZrP into In Situ Polymerized Polyethylene Terephthalate (PET) Fibers with Enhanced Mechanical Properties and Antibacterial Activities

“…The nanoparticle aggregation will inevitably lead to a decrease in mechanical properties. Such a result can be further evidenced by analyzing their crystalline change of PET in the resultant hybrid fibers [5,32].…”

Electromagnetic Interference Shielding Performances of Carbon-Fiber-Reinforced PA11/PLA Composites in the X-Band Frequency Range

“…Since CF inhibits the diffusion of products that are decomposing and slows down the diffusion process, there has been an improvement in thermal stability. In addition, the barrier effect in the matrix increases with the increasing load of CF and thus the thermal decomposition temperature gradually rises. , …”

“…In addition, the barrier effect in the matrix increases with the increasing load of CF and thus the thermal decomposition temperature gradually rises. 5,43 Flame resistance and self-extinguishing behavior as well as high thermal stability are expected from EMI shielding materials. Therefore, the flammability characteristics of PA11/PLA/CF composites were investigated by UL-94 and LOI, and the obtained data are summarized in Table 2.…”

PMMA Application in Piezo Actuation Jet for Dissipating Heat of Electronic Devices

“…Accordingly, PMMA is frequently applied in chemical processing equipment (e.g., tubes, valves, pumps, pipes, and fittings), sensors, and actuators, etc. Some chemical modifications and mechanical reinforcement techniques involving adding various types of nanofibers, nanoparticles, nanofillers, nanotubes, and hybrid materials (nanoparticles) are made known to enhance the functions of thermal and dielectric properties and tensile strength of PMMA-based materials in recent decades [ 28 , 29 , 30 , 31 , 32 , 33 ]. The present study utilizes the piezo actuation jet (PAJ) with the PMMA plate for dissipating heat of electronic devices.…”