The chapter deals with the performance evaluation of the polyethylene of raised temperature resistance (PE-RT) and polyethylene (PE) using autoclave test under sour oil and gas medium conditions. The analyses of performance changes showed that PE-RT has good media resistance at 60°C. As the temperature increases, its mechanical properties decrease, accompanied by an increase in weight. Comparative analyses showed that no matter what temperature conditions are, PE-RT media resistance is better than PE80. The better media resistance of PE-RT depends on its higher degree of branching. Short branches are distributed between the crystals to form a connection between the crystals, thereby improving its heat resistance and stress under high-temperature conditions. PE-RT forms an excellent three-dimensional network structure through copolymerization, ensuring that it has better media resistance than PE80. However, the mechanical performance will be attenuated due to the high service temperature.

中文翻译：

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在酸性介质条件下用高压釜试验研究耐高温聚乙烯的使用性能

本章通过在酸性石油和天然气介质条件下的高压釜测试，对耐高温聚乙烯（PE-RT）和聚乙烯（PE）的性能进行了评估。对性能变化的分析表明，PE-RT在60°C时具有良好的耐介质性。随着温度升高，其机械性能下降，同时重量也随之增加。对比分析表明，无论在何种温度条件下，PE-RT的耐介质性均优于PE80。PE-RT更好的耐介质性取决于其更高的支化度。短支链分布在晶体之间，以在晶体之间形成连接，从而提高了其在高温条件下的耐热性和应力。PE-RT通过共聚形成出色的三维网络结构，确保它具有比PE80更好的耐介质性。但是，由于使用温度高，机械性能会降低。