Preparation and Characterization of Nylon 6 and Lignin Coated Carbon Nanotube Composite

摘要

Novel lignin modified carbon nanotube (L-CNT) were prepared as reinforcement of nylon 6 composites. The carbon nanotube was coated with lignin using dioxane solvent. The filler was loaded in polyamide-6 composites through in-situ polymerization. Two parameters were varied i.e. (i) sonication time during in-situ reaction and (ii) L-CNT content. The effect of L-CNT on molecular weight (M_n and M_w), glass transition temperature (T_g) and tensile modulus of the composites was studied. The molecular weight of in-situ polymerized PA6 was decreased with the addition of L-CNT content. The same effect was observed with the increase in sonication time due to hindrance in chain growth by L-CNT. Significant increase in the mechanical properties was observed up to the sonication time of 0.5 h. The tensile modulus of the composites was increased to 5.9 GPa in PA 6/L-CNT 10 nanocomposite. However there was 61% increase in the tensile modulus with 10 wt. % nanofiller addition compared with 1 wt. % L-CNT. The glass transition temperature for PA 6/L-CNT 1, PA 6/L-CNT 3, PA 6/L-CNT 5, and PA 6/L-CNT 10 was found as 80, 82, 84, and 101°C at 0.5 h sonication time. Hence there was 21% increase in the T_g upon the addition of 10 wt. % filler compared with 1 wt. % L-CNT addition.