ABSTRACT

In order to improve hydrophobic surfaces with low fluorine content, an incomplete fluoroalkyl-capped polyhedral oligomeric silsesquioxane (ap-FPOSS) was synthesized as an initiator and used to initiate methylmethacrylate (MMA) to produce polymer ap-FPOSS-PMMA_100,150,200 by atom transfer radical polymerization (ATRP). Compared with fluorine-free ap-POSS-PMMA and PMMA polymers, the films cast from 200 to 470 nm core-shell micelles self-assembled by the obtained ap-FPOSS-PMMA presented higher water contact angles (114°–124°), lower surface energy (9.6–14.9 mN·m⁻¹), lower water absorption (Δf = 270 Hz), and lower viscoelasticity (Δf/ΔD = −1.7 HZ×10⁶), which were attributed to their increased surface roughness and fluorine content. Additionally, ap-FPOSS-PMMA exhibited a much higher thermostability (T_g>120°C, T_d>380°C) and light transmission (>97%) than fluorine-free polymer of ap-POSS-PMMA. The application of ap-FPOSS-PMMA proved that the low fluorine component in ap-FPOSS was able to produce a highly hydrophobic coating on a cotton surface (122°–124°).

摘要

为了改善低氟含量的疏水表面，合成了不完全的氟烷基封端的多面体低聚倍半硅氧烷（ap-FPOSS）作为引发剂，并用于引发甲基丙烯酸甲酯（MMA），通过原子转移自由基制备聚合物ap-FPOSS-PMMA _100,150,200。聚合（ATRP）。与不含氟的ap-POSS-PMMA和PMMA聚合物相比，由ap-FPOSS-PMMA自组装的200至470 nm核-壳胶束流延膜具有更高的水接触角（114°–124°），较低的表面能（9.6-14.9 mN·m ^-1），较低的吸水率（Δf= 270 Hz）和较低的粘弹性（Δf/ΔD= -1.7 HZ×10 ⁶），这归因于其增加的表面粗糙度和氟含量。此外，与ap-POSS-PMMA的无氟聚合物相比，ap-FPOSS-PMMA表现出更高的热稳定性（T _g > 120°C，T _d > 380°C）和透光率（> 97％）。ap-FPOSS-PMMA的应用证明，ap-FPOSS中的低氟成分能够在棉花表面（122°–124°）上产生高度疏水的涂层。