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In this study, a cold atmospheric pressure plasma jet was conducted to modify glass fiber. To improve the interfacial bonding properties of glass-fiber-reinforced polypropylene composites, SiOx nanoparticles were polymerized on the fiber surfaces. The properties of the modified fibers and composites, including surface morphology, chemical composition, wettability and interfacial bonding properties, were studied systematically to understand the influence of gas flow rate of the carrier on the modification effect of glass fiber. The optimal parameter was determined to be a gas flow rate of 40 mL/min. The results indicated that after plasma treatment, the fibers achieved an improvement in the surface energy by 43.18% compared to that of the control samples. The interlaminar shear strength of glass-fiber-reinforced polypropylene composites was improved by 30.79% when compared to the control. The high surface roughness and the content of oxygen-containing polarity functional groups in the glass fiber after the plasma treatment promoted an enhancement in interlaminar shear strength. [ABSTRACT FROM AUTHOR]

The thermal performance and rheological properties of PE-HDs were measured by DSC and Hakke rotational rheometer, and then its foaming properties were investigated through the batch foaming experiments. The result indicated that there was a significant effect on the foaming performance of PE-HD from its crystallization rate and viscoelastic properties. The rheological properties and molecular weight distribution of HDPE6098 were found to be suitable for the foaming process along with its fast crystallization rate. These advantages could help to obtain an expansion ratio of 17.69 times and a cell density of 1.30 x 106 cell/cm³ for the foamed PE-HD samples. However, HDPE7000F was found to have a broad high molecular-weight range and high modulus, leading to a limitation in cell growth during foaming and a poor foamed product. [ABSTRACT FROM AUTHOR]