Novel Fibers Spun from Cellulose in Anisotropic Phosphoric Acid Solution
Liquid crystalline solutions of cellulose were prepared in a kneader by mixing cellulose and phosphoric acid/poly-phosphoric acid solution. The composition of solvent is expressed in a P<,2>O<,5> concentration. lnfluence of P<,2>O<,5> concentration of compound solvent on solubility and dissolution behavior of cellulose was evaluated. The experiment results indicated that the P<,2>O<,5> concentration could play an important role in breaking the intra- and inter-molecular hydrogen bonding of cellulose and increasing the expanding extent of the cellulose molecules chains. Based on these experiment results, dissolution process and mechanism were depicted. Moreover novel regenerated cellulose fibers have been successfully spun from this cellulose dope. The tensile strength, elongation at break and crystallinity index of the novel fibers were measured to be 5.35 cN/dtex, 3.97％ and 50％, respectively, revealing good mechanical properties. The structttre of fibers was analyzed by using <13>C NMR, wide- angle X-ray diffraction (WAXD) and FT-IR spectroscopy. The experiment results show that the cellulose Ⅰ family crystal structure transferred to cellulose Ⅱ family crystal structure during the regeneration process of the fibers. This technology is simple, cheap, and environmentally friendly, promising to substitute for viscose rayon production having hazardous byproducts.
cellulose liquid crystalline solutions phosphoric acid structure
LI Zhenguo HU Panpan YU Junrong HU Zuming LIU Zhaofeng
College of Material Science and Engineering, Donghua University, Shanghai 200051, PR China
国际会议
上海
英文
750-753
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）