Despite much progress in the development of photo-initiators (PIs) for many advanced applications, their high migration and weak thermal stability are still challenging. Especially, it easily results in an incomplete curing and sacrificial separation performance in the use of polymeric membranes. PI 2-hydroxy-2-methylpropiophenone (1173) has been most frequently used in photocuring owing to its high reactivity and universal applicability. Herein, we reported a series of alkyl chain engineered PI 1173 with different chain lengths for fabricating polydimethylsiloxane (PDMS) membranes. The dodecyl isocyanate functionalized PI 1173 displayed a lower migration ratio of 1.42% from the PDMS matrix compared with 2.99% for PI 1173. Its degradation temperature was also improved where the weight loss was only 10% as the temperature was raised to 241.1 °C. Importantly, the fabricated PDMS membranes initiated by alkyl chain engineered PIs showed an excellent n-butanol permselective pervaporation (PV) with separation factor of 38–54 and total flux of 818–1396 g m⁻² h⁻¹ when feeding 1.5 wt% n-butanol aqueous solution at 60 °C. It provides a general method for fabricating high-quality separation membranes.

尽管许多先进应用的光引发剂（PI）的开发取得了很大进展，但它们的高迁移性和弱热稳定性仍然具有挑战性。特别是在高分子膜的使用过程中，很容易导致固化不完全，牺牲分离性能。PI 2-羟基-2-甲基苯丙酮(1173)由于其高反应活性和普遍适用性而最常用于光固化。在此，我们报道了一系列具有不同链长的烷基链工程PI 1173，用于制造聚二甲基硅氧烷（PDMS）膜。十二烷基异氰酸酯官能化的 PI 1173 从 PDMS 基质中的迁移率较低，为 1.42%，而 PI 1173 的迁移率为 2.99%。其降解温度也得到改善，当温度升至 241.1 °C 时，重量损失仅为 10%。重要的是，由烷基链工程PI引发的制备的PDMS膜表现出优异的正丁醇选择性渗透渗透蒸发（PV） ，当进料1.5 wt% n -时，分离因子为38-54，总通量为818-1396 g m ^-2  h ^-1 60℃的丁醇水溶液。它提供了制造高质量分离膜的通用方法。