Abstract
The addition of silicalite-1 nanoparticles (0.2–20wt%) increased slightly the crystallization temperature of HDPE with silicalite-1 content, at 20wt% loading by ca. 2.5°C, but it had little effect on the melting temperature. The nanocomposites displayed a little higher onset degradation temperature than pure polymer by 7–11°C. The WAXD profiles showed that the intensity of diffraction peaks for HDPE was decreased with increasing silicalite-1 content from 5wt% but that the peak position of every crystal plane did not shift in the presence of silicalite-1 nanoparticles. The incorporation of the nanoparticles increased the melt viscosity of HDPE with silicalite-1 content. It also increased both storage (G′) and loss modulus (G″). In the so-called Cole–Cole plot, pure HDPE showed a single master curve whose slope was 1.37, while the nanocomposites with 10 and 20wt% silicalite-1 exhibited the inflection in the low frequency range before which the slopes were 1.22 and 1.02, respectively. Much more accelerated crystallization behavior under shear was observed with silicalite-1 content at the isothermal crystallization temperature of 125°C than at 120°C.
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