Linear low‐density polyethylene (LLDPE) 7042, which has a butene comonomer, is widely used but has poor tear and dart strengths. For practical applications, small amounts of other materials can be blended with 7042 to effectively improve its properties. In this study, four blend resins and films (cast and compressed films) were prepared by blending 7042 with four LLDPEs (2045G, 9030, 23F, and 9085) in 8:2 ratios. The results indicated that after blending 2045G, 23F, or 9030 with 7042, the crystallization ability of the three blends was significantly suppressed and crystal size decreased. Moreover, the molecular chain can pass though more lamellar stacks in the blends, leading to an increased tie‐chain concentration. Therefore, the tear and dart impact strength of the blend films improved. In contrast, the crystallization ability of the 7042/9085 blend was only slightly suppressed and did not significantly impact its properties. These findings contribute to our understanding of the relationship between material structures and properties, demonstrating that LLDPE blends can be used to improve the tear and dart strengths of 7042.
The antibacterial properties of nanosilver polyethylene packaging play a pivotal role in the fields of food packaging. The difference in the crystalline structure of the materials will affect the migration of nanosilver in polyethylene, thereby affecting the antibacterial rate. A series of nanosilver/polyolefin composite films were prepared by melt blending. The investigation included scanning electron microscope-energy-dispersed analysis of X-ray, melt index, thermal properties, small-angle laser scattering, small-angle X-ray scattering, and optical properties, as well as antimicrobial activity against Escherichia coli.The results indicate that the material with a higher melt index has better fluidity and the higher antibacterial rate. Moreover, nanosilver is uniformly dispersed in the substrate. Nanosilver can increase the long period without affecting the crystalline region. For these neat materials, HDPE has the thickest lamellae, which is easier to inhibit the migration of silver, and has the lowest antibacterial rate. Meanwhile, materials with low crystallinity exhibited high antibacterial properties. The crystallinity of the composites was slightly increased by the induction of silver nanoparticles. The optical properties show that nanosilver can reduce the size of spherulites and improve the optical properties of the composites. The research has guiding significance for the commercial production of polyethylene antibacterial packaging materials.
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