Properties of Polypropylene and Surface Modified Glass-Fibre Composites

Abstract

To improve the interfacial bonding between polypropylene (PP) and glass-fibre (GF), the surface modified glass-fibre (SMGF) was prepared with the self-designed sizing containing organofunctional silanes and a copolymer. Then the SMGF-PP composites were prepared and those properties were observed by mechanical testing, light microscopy, X-ray diffractometry (XRD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Mechanical tests displayed that SMGF-PP composites had an increase in tensile strength, tensile modulus, bending strength, bending modulus and notched impact strength compared to the pure PP. Light micrographs showed that the average fibre length of the composite was 397 μm. XRD data indicated that the crystal size of SMGF-PP composites became smaller compared to pure PP, and β form crystals of PP disappeared with the addition of SMGF to PP matrix. DSC data showed that SMGF could promote the crystallization temperature of PP. TGA analyses showed that the thermal stability of SMGF-PP was better than that of pure PP.

Formulation and tensile characterization of wood–plastic composites

“…Moreover, a general way our values are lower than that of the composite PP/glass fiber. By comparison, Zhu et al 45 found 6.5 GPa for the composite PP/30 wt% glass fiber. Table 6 and Figure 3 show the difference between the elastic modulus's experimental data and analytical models (Halpin-Tsai, Tsai-Pagano, and Lavengood-Goettler).…”

The Effect of Thermoplastic Elastomer and Fly Ash on the Properties of Polypropylene Composites with Long Glass Fibers

“…According to the TGA data (Figure 3 and Table 3) a single weight-loss step was observed for all samples between 300 and 500 • C. The thermal stability of the 25% and 30% glass fiber composites is similar to that of the composite with treated ash powder and glass fiber where the temperature at the maximal rate of decomposition only varies by a maximum of 1 • C. The lowest thermal stability is associated with PP-25G-E, with a difference of almost 24 • C compared to PP-25G and PP-30G. A study by Zhu et al [40] noted that the addition of glass fiber in neat polypropylene can lead to an increase in thermal stability of polypropylene composites due to possible changes in the PP crystalline structure and the improved transfer of heat characteristics of glass fiber. It can be seen from Table 3 that E starts to decompose and decomposes at the maximum rate at temperatures 12 • C lower than PP-25G.…”

“…The lowest thermal stability is associated with PP-25G-E, with a difference of almost 24 °C compared to PP-25G and PP-30G. A study by Zhu et al [40] noted that the addition of glass fiber in neat polypropylene can lead to an increase in thermal stability of polypropylene composites due to possible changes in the PP crystalline structure and the improved transfer of heat characteristics of glass fiber. It can be seen from Table 3 that E starts to decompose and decomposes at the maximum rate at temperatures 12 °C lower than PP-25G.…”

The multiaxial behavior of filled polypropylene parts by drop-weight impact test

“…The results showed that samples from blend above-mentioned showed an increase in tensile modulus, bending modulus, tensile strength, bending strength and notched impact strength compared to pure PP. The data also showed that thermal stability of modified PP was better in comparison to the pure one [6].…”