Polystyrene (PS) with great flame retardancy has been achieved by addition of polyhedral oligomeric silsesquioxane (POSS). However, the POSS/PS composite showed easy-ignition behavior leading to fire hazard exposed. Aiming to prolong time to ignition (TTI) and improve flame retardancy simultaneously, using non-flammable modifier to decorate POSS is a facile method. Here, two kinds of POSS hybrids (POSS-ILs), denoted as POSS-EVIM and POSS-VIPSP, were synthesized by free radical copolymerization between vinyl POSS and two kinds of ionic liquid, commercial [EVIm]BF₄ and Brønsted ionic liquid, respectively. The polystyrene-based composites (POSS-ILs/PS) were prepared by incorporated POSS-ILs into polystyrene. The results of thermal gravimetric analysis test evidenced that both POSS-ILs increased char yield and decreased decomposed rate of composites. Compared with neat PS, the TTI of POSS-ILs/PS was prolonged by 26 s and 21 s, and meanwhile, the fire hazard was decreased due to reduction of peak value of heat release rate (PHRR) and smoke release rate (PSPR) in cone calorimeter test. Scanning electron microscope observed compact residue of POSS-EVIM/PS and honeycombed residual morphology of POSS-VIPSP/PS, and additionally, both of these residual char possessed higher degree of graphitization than that of PS and POSS/PS in Raman spectrum, suggesting good physical barrier for matrix from heat and oxygen. Besides, the flexural strength of both POSS-ILs/PS composites were increased compared with neat PS. Taking the results above mentioned, POSS modified by ionic liquid can be a decent candidate to prolong time to ignition, simultaneously improve fire safety and mechanical properties for polymeric materials.

通过添加多面体低聚倍半硅氧烷（POSS），可以实现具有出色阻燃性的聚苯乙烯（PS）。然而，POSS / PS复合材料表现出易燃特性，导致暴露于火中。为了延长点火时间（TTI）并同时提高阻燃性，使用不易燃的改性剂装饰POSS是一种简便的方法。在此，通过乙烯基POSS与两种离子液体（商业[EVIm] BF _4）之间的自由基共聚合成了两种POSS杂种（POSS-ILs），分别表示为POSS-EVIM和POSS-VIPSP。和Brønsted离子液体。通过将POSS-IL掺入聚苯乙烯中来制备聚苯乙烯基复合材料（POSS-ILs / PS）。热重分析测试的结果表明，两种POSS-ILs均提高了炭的收率，降低了复合材料的分解速率。与纯PS相比，POSS-ILs / PS的TTI延长了26 s和21 s，同时，由于放热率（PHRR）和烟气释放率（PSPR）的峰值降低，火灾隐患减少了在锥形量热仪测试中。扫描电子显微镜观察到POSS-EVIM / PS的致密残留和POSS-VIPSP / PS的蜂窝状残留形态，此外，这两种残留炭在拉曼光谱中均具有比PS和POSS / PS更高的石墨化程度，表明具有良好的石墨化程度。防止热量和氧气进入基质的物理屏障。此外，与纯PS相比，两种POSS-ILs / PS复合材料的抗弯强度均增加。根据上述结果，用离子液体改性的POSS可以作为延长点火时间的合适方法，同时提高聚合物材料的防火安全性和机械性能。