Manipulation of thick‐walled PEEK bushing crystallinity and modulus via instrumented compression molding,Journal of Applied Polymer Science

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Manipulation of thick‐walled PEEK bushing crystallinity and modulus via instrumented compression molding
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-18 , DOI: 10.1002/app.49930
Ruaa Al‐Mezrakchi ₁ , Terry Creasy ₂ , Hung‐Jue Sue _{1,

2,

3} , Tim Bremner ₄

Affiliation

An instrumented hot compression molding apparatus was fabricated to allow real‐time monitoring and precise temperature control during the compaction and consolidation of large polyether ether ketone (PEEK) products. The objective was to determine the impact of controlled variables on the properties of the molded article. Four different strategies were designed to control the mold thermal profiles. The average crystallinity in a commercial molding process is restricted due to large thermal masses with low thermal conductivity. In contrast, this research was able to reduce the crystallinity range from 33% to 6% by developing a special controlled apparatus and implementing new processing methodologies. In this study, PEEK showed a significant increase in the modulus compared to typical values measured on commercially produced analogs, and a higher degree of property uniformity. In a single commercially molded PEEK billet, compressive modulus variability was 13% at room temperature, and 21% at 225°C. Properties of billets produced using the laboratory apparatus showed a reduction in variability to 2%.

中文翻译：

通过仪器化压铸成型厚壁PEEK套管的结晶度和模量

制造了一种仪器化的热压成型设备，以便在大型聚醚醚酮（PEEK）产品的压实和固结过程中进行实时监控和精确的温度控制。目的是确定受控变量对模制品性能的影响。设计了四种不同的策略来控制模具的热分布。由于大的热质量和低的热导率，限制了商业模塑工艺中的平均结晶度。相反，这项研究通过开发一种特殊的受控设备并实施新的加工方法，能够将结晶度范围从33％降低到6％。在这项研究中，PEEK与在商业生产的类似物中测得的典型值相比，模量显着增加，以及更高的性能均匀性。在单个商业模制的PEEK坯料中，室温下的压缩模量变化为13％，在225°C下的压缩模量变化为21％。使用实验室仪器生产的钢坯的性能显示出变异性降低到2％。

更新日期：2020-11-25

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