Thermo‐mechanical properties of glass fiber and functionalized multi‐walled carbon nanotubes filled polyester composites

Abstract

Glass fiber (GF) and hydroxyl‐functionalized multi‐walled carbon nanotubes (MWCNTs)‐reinforced polyester‐based composites were prepared by solution casting technique. Unsaturated polyester (UPE) was mixed separately with a fixed amount (0.5 wt%) of hydroxyl‐functionalized MWCNTs and GF (5.0 wt%). Multi‐walled carbon nanotubes (MWCNTs) were functionalized with hydroxyl functional group (OH) prior to the fabrication of the composites. The structural properties were evaluated by Fourier transform infrared spectroscopy. The mechanical properties of the composites, like tensile strength, tensile modulus, flexural strength, flexural modulus, and impact strength were also evaluated. The surface of the samples was observed by the field‐emission electron microscopy. In addition, the thermal stability was assessed by thermogravimetric analysis and differential scanning calorimetry. The dynamic thermal mechanical analysis was also performed to assess the performance of the composites at elevated temperature. A comparative analysis of the composites prepared with GF and hydroxyl‐functionalized MWCNTs was described. Result analysis showed that hydroxyl functional group‐based MWCNTs is more effective for improving the properties of the composites, compared to the others. POLYM. COMPOS., 40:E1235–E1242, 2019. © 2018 Society of Plastics Engineers

Thermal and thermo-mechanical characterization of MWCNTs integrated E-glass/carbon fabric reinforced composites

“…The storage moduli at 25 C increased by 2.5 to 43.1% with different types of MWCNTs additions. In a study conducted by Islam et al [35], a 14% increase was observed in the storage modulus value with the addition of MWCNT-OH to the polyester-based composite material, while the increase in the storage modulus values varied between 20-40% in the studies conducted with MWCNT added epoxy resin-based composites [3,18]. This high increment achieved in this study can be related to the good dispersion of nanoparticles in the matrix.…”

“…With the addition of different MWCNT types, a decrease in tan delta value between 12.5% and 20% was observed. In the study carried out by Islam et al [35], it was observed that the decrease in tan delta value was around 25% where MWCNT-OH added polyester resin was utilized as a matrix system. Moreover, it is known that between –OH functional group of MWCNT-OH and >C = O functional group of unsaturated polyester resin, a hydrogen bond is created, while π-π interactions between pristine MWCNT and unsaturated polyester resin is formed owing to the characteristics of carbon nanostructures [33].…”

“…With the addition of different MWCNT types, a decrease in tan delta value between 12.5% and 20% was observed. In the study carried out by Islam et al [35], it was observed that the decrease in tan delta value was around 25% where MWCNT-OH added polyester resin was utilized as a matrix system. Moreover, it is known that between -OH functional group of MWCNT-OH and >C ¼ O Table 5.…”

Degradation analysis of epoxy resin composites reinforced with bioprotein: Effects of hydrolysis using papain and bromelain

“…The formation of microcracks at the surface reduces the flexural properties of the composites. [ 38‐39 ]…”

“…The formation of microcracks at the surface reduces the flexural properties of the composites. [38][39] Table 1 shows the IS of the NE and EFS composites before and after degradation. It was found that the IS of the NE and EFS composites before degradation were 5.9 and 2.9 kJ/m 2 , respectively.…”