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Synthesis of Weakly Entangled Ultra-High-Molecular-Weight Polyethylene with a Fine Particle Size
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-16 , DOI: 10.1021/acs.iecr.0c05838 Mei Chen 1, 2 , Yuming Chen 1, 3 , Wei Li 2 , Peng Liang 1, 2 , Congjing Ren 1, 3 , Binbo Jiang 1 , Jingdai Wang 1, 3 , Yongrong Yang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-16 , DOI: 10.1021/acs.iecr.0c05838 Mei Chen 1, 2 , Yuming Chen 1, 3 , Wei Li 2 , Peng Liang 1, 2 , Congjing Ren 1, 3 , Binbo Jiang 1 , Jingdai Wang 1, 3 , Yongrong Yang 1
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A facilely catalytic approach to prepare weakly entangled ultra-high-molecular-weight polyethylene (UHMWPE) with a fine particle size is reported with the polyhedral oligomeric silsesquioxane (POSS)-modified MgCl2-based Ziegler–Natta catalyst. CO in situ FTIR spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and N2 adsorption and desorption experiments revealed that the POSSs can coordinate with the MgCl2(110) plane, acting as adhesives with a cage structure to be in situ embedded into the MgCl2-based support. This in situ embedding of POSS facilitated the uniform dispersion of POSS nanoparticles, contributing the isolation effect for active TiCl4 sites in the molecular scale, thus synthesizing the weakly entangled UHMWPE with exceptional activities. Simultaneously, the MgCl2-based catalysts afforded UHMWPE particles with small sizes, where POSS-modified catalysts brought the UHMWPE particle size down to below 200 μm, thanks to their considerable activities. To the best of our knowledge, this is the first time that nascent UHMWPE with a less entangled state and a fine particle size was synthesized. This combination of structural advantages enables substantial improvements in the toughness/stiffness/strength balance of nascent UHMWPE, especially for the impact strength which can reach 113.6 kJ/m2 with a relatively low molecular weight.
中文翻译：
细粒度的弱缠结超高分子量聚乙烯的合成
据报道，使用多面体低聚倍半硅氧烷（POSS）改性的MgCl 2基的齐格勒-纳塔催化剂，可以轻松地制备具有细粒度的弱缠结超高分子量聚乙烯（UHMWPE）。CO原位FTIR光谱，X射线光电子能谱，扫描电子显微镜，透射电子显微镜以及N 2吸附和解吸实验表明，POSS可以与MgCl 2（110）平面配合，充当具有笼型结构的粘合剂是原位嵌入的MgCl 2基载体。这原位POSS的嵌入促进了POSS纳米颗粒的均匀分散，有助于在分子尺度上分离活性TiCl 4位点，从而合成了具有出色活性的弱缠结的UHMWPE。同时，基于MgCl 2的催化剂提供了小尺寸的UHMWPE颗粒，其中POSS改性的催化剂由于其相当大的活性而使UHMWPE颗粒尺寸降至200μm以下。据我们所知，这是首次合成具有较小纠缠态和细粒度的初生UHMWPE。这种结构优势的结合可以显着提高新生UHMWPE的韧性/刚度/强度平衡，特别是对于可以达到113.6 kJ / m的冲击强度而言2具有相对较低的分子量。
更新日期：2021-03-03
中文翻译：
细粒度的弱缠结超高分子量聚乙烯的合成
据报道，使用多面体低聚倍半硅氧烷（POSS）改性的MgCl 2基的齐格勒-纳塔催化剂，可以轻松地制备具有细粒度的弱缠结超高分子量聚乙烯（UHMWPE）。CO原位FTIR光谱，X射线光电子能谱，扫描电子显微镜，透射电子显微镜以及N 2吸附和解吸实验表明，POSS可以与MgCl 2（110）平面配合，充当具有笼型结构的粘合剂是原位嵌入的MgCl 2基载体。这原位POSS的嵌入促进了POSS纳米颗粒的均匀分散，有助于在分子尺度上分离活性TiCl 4位点，从而合成了具有出色活性的弱缠结的UHMWPE。同时，基于MgCl 2的催化剂提供了小尺寸的UHMWPE颗粒，其中POSS改性的催化剂由于其相当大的活性而使UHMWPE颗粒尺寸降至200μm以下。据我们所知，这是首次合成具有较小纠缠态和细粒度的初生UHMWPE。这种结构优势的结合可以显着提高新生UHMWPE的韧性/刚度/强度平衡，特别是对于可以达到113.6 kJ / m的冲击强度而言2具有相对较低的分子量。
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