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Crosslinking density of vulcanized rubber which was filled with carbon black and silica was experimentally researched, and its corresponding heat generation, dynamic lag loss (tanδ) and loss modulus ( E″) were also studied. Based on these tests, the model of the relationship among them was established. The results showed that the characteristic value of crosslinking density Vr almost showed downward trend as a straight line when the quantity of silica increased, but temperature rise, loss modulus E″ and tanδ increased obviously. Silane coupling agent Si-69 could improve the crosslink density and dynamic performance. In the drawing, linear correlation was good in linear fitting between temperature rise and loss modulus, as well as between temperature rise and tanδ. Keywords: vulcanized rubber; crosslingking density; heat generation; hysteresis

Soy protein has been considered as a kind of natural polymer and an ecological material that was widely used in many fields such as food industry. In this paper, the soy protein isolate (SPI) was modified by glutaric dialdehyde and characterized by IR spectra, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The modified soy protein isolate as reinforcing filler partly replaced some carbon black was used to prepare the SPI/rubber composites. Based on the mechanical and dynamic tests of their vulcanizates, the results showed that when a small amount of modified SPI (8~10phr) as reinforcement agent was used, the mechanical properties were improved. Moreover, the changes of their lgE’ and tanδ occurred.

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Abstract. Anti-fog films of low density polyethylene (LDPE) modified with micrometer diatomite were prepared by a process of blow molding. Through examination of antifogging property of the film added the anti-fog agents, the modification effectiveness of inorganic micrometer diatomite and the influence of different treating agents were studied with Fourier transform infrared spectrometer (FTIR), mechanical properties, and antifogging performances. The results indicate that the anti-fog property of the film can be improved by premixing inorganic micrometer diatomite with the anti-fog agents; the film modified by inorganic micrometer diatomite added surface treatment agent has obviously effectiveness anti-fog properties than that the films modified only by the anti-fog agents. Addition of polyacrylamide can make the anti-fog durability of the films modified by inorganic micrometer diatomite be further prolonged. It was observed that the tensile strength does not show any decrease, however, elongation at break show a massive decreased.