Kim A Young, Lee Seon Ju, Choi Moon Young, Na Changyub, Kwac Lee Ku, Kim Hong Gun, Chang Jin-Hae
Graduate School of Carbon Convergence Engineering, Jeonju University Jeonju 55069 Korea.
Institute of Carbon Technology, Jeonju University Jeonju 55069 Korea
RSC Adv. 2023 Aug 14;13(35):24423-24431. doi: 10.1039/d3ra04587k. eCollection 2023 Aug 11.
Polyamic acid (PAA) was synthesized using the diamine monomer ,'-[2,2'-bis(trifluoromethyl)-4,4'-biphenylene]bis(4-aminobenzamide) and dianhydride monomer 4,4'-oxydiphthalic anhydride. Colorless and transparent poly(amide imide) (CPAI) hybrid films were prepared multi-step thermal imidization of PAA in which various contents of nano-filler were dispersed. The CPAI hybrid films were prepared by dispersing organoclay STN, which was obtained by organically modifying hectorite, in CPAI by solution intercalation with various contents ranging from 1 to 7 wt%. The thermomechanical properties, morphologies, and optical transparencies of the obtained CPAI hybrid films were investigated based on the dispersed STN content, and the results were compared. Some of the clay in the CPAI hybrid film were agglomerated, which was observed using a transmission electron microscope; however, most clays were well-dispersed, with a nano-size of less than 10 nm. The best thermomechanical properties of the CPAI hybrid film were exhibited with an STN content of 3 wt%, but these properties decreased above the critical content. The coefficients of thermal expansion of all the hybrid films were below 20 ppm per °C regardless of the amount of STN, and the yellow index was 1-2 even when the STN content increased to 7 wt%.
使用二胺单体' - [2,2'-双（三氟甲基）-4,4'-联苯撑]双（4-氨基苯甲酰胺）和二酐单体4,4'-氧二邻苯二甲酸酐合成聚酰胺酸（PAA）。通过对分散有各种含量纳米填料的PAA进行多步热亚胺化制备无色透明聚（酰胺酰亚胺）（CPAI）杂化膜。CPAI杂化膜是通过将有机改性锂皂石得到的有机粘土STN以1至7 wt％的各种含量通过溶液插层分散在CPAI中来制备的。基于分散的STN含量研究所得CPAI杂化膜的热机械性能、形态和光学透明度，并对结果进行比较。使用透射电子显微镜观察到CPAI杂化膜中的一些粘土发生了团聚；然而，大多数粘土分散良好，纳米尺寸小于10 nm。当STN含量为3 wt％时，CPAI杂化膜表现出最佳的热机械性能，但高于临界含量时这些性能会下降。无论STN含量如何，所有杂化膜的热膨胀系数均低于20 ppm/°C，即使STN含量增加到7 wt％，黄色指数也为1-2。
