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对暴露于H₂S食尸动物的聚胺微观结构变化和分子运动的新见解

Marina Perassoli de Lazari¹, Antonio Henrique Monteiro da Fonseca Thomé da Silva^2,3, Rodrigo Henrique Dos Santos Garcia¹

¹Instituto de Física de São Carlos, Universidade de São Paulo, 400 Parque Arnold Schimidt, São Carlos 13566-590, SP, Brazil.

|June 27, 2025

概括

硫化清除剂暴露会通过导致可塑剂损失和交叉连接而降解聚胺. 这影响了材料性能,这对于海上石油和天然气设备的寿命至关重要.

科学领域:

材料科学材料科学材料科学
聚合物化学聚合物化学
腐蚀工程腐蚀工程

背景情况:

聚胺 (PA) 是海上石油和天然气 (O&G) 设备中至关重要的屏障材料.
长期暴露于硫化清除剂 (H2S-SCVs) 可能会降低PA的性能.
之前的研究表明,H2S-SCV增加了玻璃过渡温度 (Tg) 并降低了链的流动性.

研究的目的:

综合调查暴露于乙氧化H2S-SCVs的PA中的分子变化.
阐明PA在具有攻击性的O&G环境中的降解机制.
基于先前关于H2S-SCV对PA分子动态的影响的发现.

主要方法:

里埃变换红外光谱法 (FTIR) 是一种
拉曼光谱法拉曼光谱法
质子双量子时间域核磁共振 (1H DQ-TD-NMR)
碳-13 固态核磁共振 (13C ssNMR) 的研究结果

主要成果:

暴露于H2S-SCV引起了PA基质中逐渐的塑化剂排泄.
塑化剂损失和H2S-SCV诱导的交联被确定为关键的降解因素.
1H DQ-TD-NMR证实了动态受约束链的增加,而13C ssNMR显示了固定的H2S-SCV组,表明交叉链接.

结论:

塑化剂损失和H2S-SCV诱导的交叉连接都对PA的微观结构进化有显著的贡献.
这些发现为在恶劣的操作环境下对PA降解机制提供了关键的见解.
了解这些机制对于预测和提高PAs在O&G应用中的长期性能至关重要.

关键词:

一个小时的时间域NMR.这是一个H2S清洁者.红外光谱学红外光谱学塑化剂的排泄物是可以使其变质的.聚胺降解降解的方法固态 13C NMR 的固态 13C NMR 的固态

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