Estimating the Dielectric Constant of Cellulose Acetate Fiber Aggregation with Its Components Volume Fraction

For the sake of studying the relationship between dielectric constant (ε) of cellulose acetate fiber aggregation and volume fraction of its compositions (including cellulose acetate fibers, water and oiling agent), the dielectric spectrum of the aggregation was measured in two forms with a Broadband Dielectric Spectrum (BDS) test system- dry cellulose acetate fibers (dry samples) and oiled cellulose acetate fibers (oiled samples). The measurement data show that dielectric constant has a linear correlation with the volume fraction of cellulose acetate fibers and the oiling agent in the aggregation, and has a non-linear correlation with the volume fraction of water in the aggregation. A function between dielectric constant of the cellulose acetate fiber aggregation and volume fraction of the components was fitted with 1stOpt. The function is in close proximity to the measured data.

Evaluation of the Surface of PLA/β-TCP Powder Complex Braid

This paper aims to prepare porous-structured PLA/β-TCP complex braid fabric. Cells fail to attach to PLA due to its hydrophobicity. Usually oiling agent is added to exclude static electricity. As a result, base refinement was applied to remove oil agents in order to observe cell adhesiveness. When PLA braid fabrics were immersed in 1 wt% NaOH for fifteen minutes, there are a maximum amount of cells on the surface. The concentration of NaOH solution matters little to cell coherence. The results of pH test and cytotoxicity test on extracts suggested that β-TCP can balance acidity in PLA and higher the cell’s survival rate.