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Manufacture of and environmental effects on carbon fiber-reinforced phenylethynyl-terminated poly(etherimide).

机译：碳纤维增强的苯乙炔基封端的聚醚酰亚胺的制造及其对环境的影响。

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The initial objective of this research project was to determine the feasibility of manufacturing carbon fiber-reinforced (CFR) composites with a matrix consisting of a phenylethynyl-terminated version of a thermoplastic poly(etherimide) termed PETU. Successful composite manufacture with 3,000 g/mol (3k) PETU led to a survey of CFR 3kPETU mechanical properties for comparison with other high-performance composites. Encouraging results led to a study of moisture sorption effects on CFR 3kPETU properties. The success of these initial studies spawned the large scale production of 2,500 g/mol (2.5k) PETU.; Thermal characterization of neat and CFR 2.5kPETU via differential scanning calorimetry, dynamic mechanical thermal analysis, and parallel plate rheometry resulted in an understanding of the influence of cure time and temperature on reaction progress via both reaction kinetics and monitoring of the glass transition temperature. From the rheological characterization, a two-stage, dual-Arrhenius model was developed to successfully model isothermal complex viscosity over the range of processing temperatures.; Neat 2.5kPETU and CFR 2.5kPETU specimens were exposed separately to elevated temperature environments of different moisture and different oxygen concentrations to evaluate the effects of moisture absorption, moisture desorption, and thermal oxidation on material properties. Moisture absorption took place in a 90°C/85% relative humidity environment followed by moisture desorption in a 90°C/10% relative humidity environment. Thermal-oxidative aging for up to 5000 hours took place at 204°C in environments of four different oxygen partial pressures: 0.0 kPa, 2.84 kPa, 20.2 kPa, and 40.4 kPa. Following exposure to the different aging environments, the specimens were tested for retention of mechanical properties. In addition, moisture sorption properties were measured.; Results from the moisture sorption studies on CFR 3kPETU and CFR 2.5kPETU suggest that fully cured composites will withstand moisture absorption and desorption with negligible effects on mechanical properties, whereas, lack of full cure allows moisture sorption to permanently damage the composites. Despite a lack of mass loss or visual evidence of degradation following thermal-oxidative aging, a decline in mechanical properties was observed with the reduction becoming greater with longer aging times and higher oxygen partial pressures.
机译：这项研究项目的最初目标是确定制造具有基体的碳纤维增强（CFR）复合材料的可行性，该基体由苯基乙炔基封端的热塑性聚醚醚酰亚胺（称为PETU）组成。 3,000 g / mol（3k）PETU的成功复合材料生产导致对CFR 3kPETU力学性能的调查，以便与其他高性能复合材料进行比较。令人鼓舞的结果导致研究了水分吸收对CFR 3kPETU性能的影响。这些初步研究的成功催生了2,500 g / mol（2.5k）PETU的大规模生产。通过差示扫描量热法，动态机械热分析和平行板流变法对纯净和CFR 2.5kPETU进行热表征可通过反应动力学和监测玻璃化转变温度来了解固化时间和温度对反应进度的影响。从流变学特性出发，建立了一个两阶段双Arrhenius模型来成功地模拟加工温度范围内的等温复数粘度。将整洁的2.5kPETU和CFR 2.5kPETU标本分别暴露于不同水分和不同氧气浓度的高温环境中，以评估水分吸收，水分解吸和热氧化对材料性能的影响。在90℃/ 85％相对湿度的环境中吸收水分，然后在90℃/ 10％相对湿度的环境中吸收水分。在四个不同的氧气分压：0.0 kPa，2.84 kPa，20.2 kPa和40.4 kPa的环境中，于204°C进行了长达5000小时的热氧化老化。暴露于不同的老化环境后，测试样品的机械性能。另外，测量了吸湿性能。 CFR 3kPETU和CFR 2.5kPETU的吸湿性研究结果表明，完全固化的复合材料可承受水分的吸收和解吸，而对机械性能的影响可忽略不计，而缺乏完全固化会使吸湿性永久损坏复合材料。尽管缺乏质量损失或在热氧化老化后没有明显的降解迹象，但观察到机械性能下降，随着老化时间的延长和氧气分压的升高，这种降低变得更大。

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