The study aimed to determine the influence of shear stress during real-life industrial processes such as compression molding and injection molding to different cavities on the crystallization of the isotactic polypropylene nucleated with a novel silsesquioxane-based β-nucleating agent. Octakis(N2,N6-dicyclohexyl-4-(3-(dimethylsiloxy)propyl)naphthalene-2,6-dicarboxamido)octasilsesquioxane (SF-B01) is a highly effective nucleating agent (NA) based on the hybrid organic-inorganic silsesquioxane cage. The samples containing various amounts of the silsesquioxane-based and commercial iPP β-nucleants (0.01–0.5 wt%) were prepared by compression molding and injection molding, including forming in the cavities with different thicknesses. The study of the thermal properties, morphology, and mechanical properties of iPP samples allows for obtaining comprehensive information about the efficiency of silsesquioxane-based NA in shearing conditions during the forming. As a reference sample, iPP nucleated by commercial β-NA (namely N2,N6-dicyclohexylnaphthalene-2,6-dicarboxamide, NU-100) was used. The static tensile test assessed the mechanical properties of pure and nucleated iPP samples formed in different shearing conditions. Variations of the β-nucleation efficiency of the silsesquioxane-based and commercial nucleating agents caused by shear forces accompanying the crystallization process during forming were evaluated by differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS). The investigations of changes in the mechanism of interactions between silsesquioxane and commercial nucleating agents were supplemented by rheological analysis of crystallization. It was found that despite the differences in the chemical structure and solubility of the two nucleating agents, they influence the formation of the hexagonal iPP phase in a similar way, taking into consideration the shearing and cooling conditions.

中文翻译：

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加工过程中剪切应力对倍半硅氧烷类β-成核剂等规聚丙烯结构、形貌和性能的影响

该研究旨在确定在现实生活中的工业过程中剪切应力对不同型腔的压缩成型和注塑成型过程中的剪切应力对用新型倍半硅氧烷基 β-成核剂成核的全同立构聚丙烯结晶的影响。Octakis(N2,N6-dicyclohexyl-4-(3-(dimethylsiloxy)propyl)naphthalene-2,6-dicarboxamido)octasilsesquioxane (SF-B01) 是一种基于杂化有机-无机倍半硅氧烷笼的高效成核剂 (NA) . 通过压缩成型和注塑成型，包括在不同厚度的空腔中成型，制备了含有不同量的倍半硅氧烷基和商用 iPP β-成核剂（0.01-0.5 wt%）的样品。热性能、形貌的研究，iPP 样品的性能和机械性能允许获得有关基于倍半硅氧烷的 NA 在成型过程中的剪切条件下的效率的综合信息。作为参考样品，使用由商业 β-NA（即 N2,N6-二环己基萘-2,6-二甲酰胺，NU-100）成核的 iPP。静态拉伸试验评估了在不同剪切条件下形成的纯 iPP 和成核 iPP 样品的机械性能。通过差示扫描量热法 (DSC) 和广角 X 射线散射 (WAXS) 评估了倍半硅氧烷基和商业成核剂的 β-成核效率的变化，这些成核剂由成形过程中伴随结晶过程的剪切力引起。结晶的流变学分析补充了倍半硅氧烷与商业成核剂之间相互作用机制变化的研究。研究发现，尽管两种成核剂的化学结构和溶解度不同，但考虑到剪切和冷却条件，它们以类似的方式影响六方 iPP 相的形成。