有机硅接枝聚合法制备超疏水棉织物

Preparation of Superhydrophobic Fabric by Silicone Graft Polymerization

摘要:

以硝酸铈铵（CAN）为引发剂，以含有乙烯基的聚二甲基硅氧烷（VPDMS）和八乙烯基八硅倍半氧烷（VPOSS）为原料，对棉布进行接枝聚合疏水改性；在此基础上，利用体系内残留的乙烯基与巯基单体进行点击反应，引入长链烷基单体和含氟单体。采用红外光谱仪（FTIR）、X-ray光电子能谱仪（XPS）和扫描电子显微镜（SEM）对改性后纤维表面化学结构、形貌进行了表征，结果表明VPDMS、VPOSS成功接枝到纤维表面，且通过点击反应的方法实现了二次改性。通过接触角测量仪对改性后棉布的疏水性能进行了表征，发现当使用多乙烯基聚二甲基硅氧烷（MVPDMS10%）与VPOSS共聚接枝改性时，接触角可达153°，使用全氟癸硫醇（PFDCMC）进行二次改性后，接触角可达164°。通过磨耗实验、耐水洗实验和耐酸实验发现PFDCMC二次改性棉布疏水性能最优，且具有自修复特性。

Abstract:

cotton fabric was prepared by grafting polymerization using vinyl-containing polydimethylsiloxane (VPDMS) and octavinyloctasilasesquioxane (VPOSS) as raw materials, and cerium ammonium nitrate (CAN) as initiator.Moreover, thiol/ene click reaction was adopted to introduce long chain alkyl monomers and fluorine-containing monomer onto fabric that had vinyl remained. The chemical structure and morphology of the modified fabric were characterized by infrared spectrometer (FTIR), X-ray photoelectron spectrometer (XPS) and scanning electron microscope (SEM). The results showed that VPDMS and VPOSS were grafted onto fibers successfully, besides, the secondary modification was realized by thiol/ene click reaction. The hydrophobic properties of the modified fabric were characterized by the contact angle measuring instrument. It was found that the contact angle reached 153° when MVPDMS10% and VPOSS were copolymerized, and the contact angle reached 164° after the secondary modification by PFDCMC.Abrasion test, laundering test and acid resistant test were used to test the durability of hydrophobic modification. It was found that PFDCMC secondary modification fabric had the best hydrophobic performance. Furthermore, self-healing property was also observed.