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首页> 外文期刊>RSC Advances >Enhanced nucleation of polypropylene by metal-organic frameworks (MOFs) based on aluminium dicarboxylates: influence of structural features
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Enhanced nucleation of polypropylene by metal-organic frameworks (MOFs) based on aluminium dicarboxylates: influence of structural features

机译：基于二羧酸铝的金属有机骨架（MOF）增强了聚丙烯的成核作用：结构特征的影响

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摘要

Metal-organic frameworks (MOFs) based on aluminium dicarboxylates provide a new platform for the enhanced nucleation of isotactic polypropylene (iPP). For instance, aluminium dicarboxylates exhibit a unique butterfly-like structure similar to that of carboxylate-alumoxanes and correlates well with the nucleation characteristics of iPP. A subtle change in the structure of the ligand backbone (fumarate/succinate) does not alter the framework structure despite changing the hydrophilic/hydrophobic character and its subsequent nucleation characteristics. This suggests that the nucleating agent should facilitate favourable interaction with hydrophobic iPP for efficient nucleation. Further, a systematic variation of the alkyl chain length in the Al-dicarboxylate does not change the nucleation efficiency considerably, even though it increases the distance between the octahedral alumina chains in the metal-organic framework, suggesting that the butterfly-like structure present in the framework is a key aspect for nucleation. Finally, the significance of the orientational conformation of the dicarboxylate around the metal centre for the nucleation is confirmed by the poor nucleation efficiency of chromium and zirconium suberate MOFs where the orientation of suberate would be different from that of aluminium suberate due to the difference in the ligation of the carboxylate group. The present work thus provides valuable pathways for developing new nucleating agents based on MOFs with appropriate selection and orientation of the organic linkers around the metal centre.
机译：基于二羧酸铝的金属有机骨架（MOF）为增强等规聚丙烯（iPP）的成核提供了新的平台。例如，二羧酸铝具有类似于羧酸铝铝氧烷的独特蝴蝶状结构，并且与iPP的成核特性良好相关。尽管改变了亲水/疏水特性及其随后的成核特性，但配体主链的结构（富马酸酯/琥珀酸酯）的细微变化不会改变骨架结构。这表明成核剂应促进与疏水性iPP的良好相互作用，以实现有效的成核。此外，即使增加了金属有机骨架中八面体氧化铝链之间的距离，二羧酸铝中烷基链长度的系统变化也不会显着改变成核效率，这表明存在于金属中的蝴蝶状结构。该框架是成核的关键方面。最后，由于辛二酸铬和辛酸锆MOF的成核效率差，证实了二羧酸盐在金属中心周围的取向构象对于成核的重要作用，其中由于辛二酸和辛二酸锆的MOF的差异，辛二酸的取向与辛二酸铝的取向不同。羧基的连接。因此，本工作为基于MOF的新成核剂的开发提供了有价值的途径，并且围绕金属中心对有机连接基进行了适当的选择和定向。

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