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首页> 美国卫生研究院文献>Polymers >Improved Processability and the Processing-Structure-Properties Relationship of Ultra-High Molecular Weight Polyethylene via Supercritical Nitrogen and Carbon Dioxide in Injection Molding
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Improved Processability and the Processing-Structure-Properties Relationship of Ultra-High Molecular Weight Polyethylene via Supercritical Nitrogen and Carbon Dioxide in Injection Molding

机译：注射成型中超临界氮和二氧化碳对超高分子量聚乙烯的加工性能和加工结构性能关系的改善

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摘要

The processability of injection molding ultra-high molecular weight polyethylene (UHMWPE) was improved by introducing supercritical nitrogen (scN2) or supercritical carbon dioxide (scCO2) into the polymer melt, which decreased its viscosity and injection pressure while reducing the risk of degradation. When using the special full-shot option of microcellular injection molding (MIM), it was found that the required injection pressure decreased by up to 30% and 35% when scCO2 and scN2 were used, respectively. The mechanical properties in terms of tensile strength, Young’s modulus, and elongation-at-break of the supercritical fluid (SCF)-loaded samples were examined. The thermal and rheological properties of regular and SCF-loaded samples were analyzed using differential scanning calorimetry (DSC) and parallel-plate rheometry, respectively. The results showed that the temperature dependence of UHMWPE was very low, suggesting that increasing the processing temperature is not a viable method for reducing injection pressure or improving processability. Moreover, the use of scN2 and scCO2 with UHMWPE and MIM retained the high molecular weight, and thus the mechanical properties, of the polymer, while regular injection molding led to signs of degradation.
机译：通过向聚合物熔体中引入超临界氮（scN2）或超临界二氧化碳（scCO2），可以改善注塑超高分子量聚乙烯（UHMWPE）的加工性能，从而降低了其粘度和注射压力，同时降低了降解风险。当使用微孔注射成型（MIM）的特殊全注选项时，发现当使用scCO2和scN2时，所需的注射压力分别降低了30％和35％。检查了机械性能，包括抗拉强度，杨氏模量和超临界流体（SCF）加载的样品的断裂伸长率。使用差示扫描量热法（DSC）和平行板流变法分别分析了常规样品和SCF样品的热学和流变学性质。结果表明，UHMWPE的温度依赖性非常低，这表明提高加工温度不是降低注射压力或改善加工性能的可行方法。此外，将scN2和scCO2与UHMWPE和MIM结合使用可保留聚合物的高分子量，并因此保留其机械性能，而常规的注塑成型则导致降解的迹象。

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