Abstract This study describes the synthesis and characterization of poly(ether sulfone) Udel® (PSU-Udel) derivatives by means of post-polymerization Friedel-Crafts acylation. PSU derivatives containing acetyl, hexanoyl and decanoyl side groups were prepared, with different acylation degrees, and their thermal and mechanical properties were evaluated. It was observed that the Tg of the derivatives decreases linearly with the acylation degree (AD) (184 °C for neat PSU, 169 °C and 140 °C for the acetylated derivative (PSU-A) with AD of 10 % and 19 %, respectively) and the slope is dependent on the length of the acyl group, being more pronounced for PSU-A. The thermal stability is not significantly affected. Stress relaxation tests demonstrate the influence of the side groups on the viscous response of blends of the derivatives with neat PSU (50/50% wt), as shown by viscoelastic models. The results demonstrate the potential for the use of post-polymerization acylation to adjust the thermal and mechanical properties of PSU aimed at specific applications.

中文翻译：

---

通过后聚合 Friedel-Crafts 酰化调节 PSU 的热和机械性能

摘要 本研究描述了聚（醚砜）Udel® (PSU-Udel) 衍生物通过聚合后 Friedel-Crafts 酰化的合成和表征。制备了含有乙酰基、己酰基和癸酰基侧基的不同酰化度的PSU衍生物，并对其热力学性能进行了评价。观察到衍生物的 Tg 随酰化度 (AD) 线性下降（纯 PSU 为 184 °C，AD 为 10% 和 19% 的乙酰化衍生物 (PSU-A) 为 169 °C 和 140 °C ，分别）并且斜率取决于酰基的长度，对于 PSU-A 更为明显。热稳定性没有显着影响。应力松弛测试证明了侧基对衍生物与纯 PSU (50/50% wt) 混合物的粘性响应的影响，如粘弹性模型所示。结果证明了使用聚合后酰化来调整 PSU 的热和机械性能的潜力，以针对特定应用。