摘要
以含水率13.7%的N-甲基吗啉-N-氧化物(NMMO)为溶剂溶解木浆纤维素形成溶液,采用红外光谱分析仪对木浆纤维素的溶解过程进行表征,并采用黏度计研究了木浆纤维素/NMMO·H2O溶液的流变性能。结果表明:木浆纤维素在NMMO中先溶胀后溶解,且可完全溶解;木浆纤维素/NMMO·H2O溶液的流动呈现切力变稀的假塑性流体特征;木浆纤维素质量分数为6%时,溶液的非牛顿流动特征明显,溶液的表观黏度(ηa)随木浆纤维素浓度的增加明显增加,随剪切速率(γ)及温度的上升而下降,当γ高于一定值即logγ大于1.3时,溶液的ηa不受温度的影响,只随γ的上升而下降,且剪切应力不随γ变化而变化,为恒定值。
N-methyl morpholine-N-oxide （NMMO） with the water content of 13.7% was used as the solvent for wood pulpcellulose. The dissolution process of wood pulp cellulose was characterized by infrared spectrometry. The theological behavior ofwood pulp cellulose/NMMO ·H20 solution was studied with a viseometer. The results showed that wood pulp cellulose swelledand then completely dissolved in NMMO solution; the wood pulp cellulose/NMMO · H20 solution exhibited the characteristics ofshear thinning pseudoplastic fluid; the characteristics of non-Newtonian fluid was obviously observed as the solution contained 6%wood pulp cellulose by mass fraction; the apparent viscosity （ r/a ） of the solution was profoundly increased with the increase ofwood pulp cellulose concentration and was decreased with the elevation of shearing rate （？） ） and temperature; r/a did not changewith the temperature but dropped with the increase of γ , and the shearing stress remained constant without beating upon γ whenlog γ was higher than 1.3.
出处
《合成纤维工业》
CAS
2015年第3期38-40,共3页
China Synthetic Fiber Industry
基金
河南工程学院轻化工程技术研究中心计划项目(GCZX2013003)
