外加盐对海藻酸钠溶液流变行为的影响
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- 英文论文题名：Influence of salt on rheological behaviors of sodium alginate solutions
- 论文作者：王立斌 ; 窦雪宇 ; 夏延致 ; 谭业强 ; 隋坤艳
- 英文论文作者：Libin Wang ; Xueyu Dou ; Yanzhi Xia ; Yeqiang Tan ; Kunyan Sui ; School of Materials Science and Engineering ; State Key Laboratory Clutivating Base for New Fiber Materials and Modern Textile ; Qingdao University
- 年：2016
- 作者机构：青岛大学材料科学与工程学院纤维新材料与现代纺织国家重点实验室培育基地;
- 论文关键词：海藻酸钠 ; 外加盐 ; 水凝胶 ; 流变学
- 英文论文关键词：Sodium alginate ; Added salt ; Steady rheology ; Scaling relations
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十七分会：流变学
- 语种：中文
- 分类号：O631.21
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十七分会 ; 流变学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：217k
- 原文格式：D
- 会议级别：全国
摘要
海藻酸钠(Sodium Alginate,SA)是一种被广泛研究的聚阴离子电解质,其功能性与加工性受到外加盐的显著影响。本文通过旋转流变仪研究了SA在水溶液和0.2M NaCl盐溶液中的稳态粘度的浓度依赖性,依此标度关系得到两者的浓度分区图。在无盐情况下,SA溶液划分为稀溶液、亚浓非缠结溶液、亚浓缠结溶液以及浓溶液四个浓度区域,对应的标度关系分别为η_(sp)~C、η_(sp)~C~(1/2)、η_(sp)~C~(3/2)和η_(sp)~C~(7/2);三个临界浓度分别为分子链开始重叠的浓度(C~*,0.02 wt%)、分子链开始缠结的浓度(Ce,0.2 wt%)、聚电解质电荷完全被屏蔽时的浓度(C_D,0.8 wt%)。加入0.2M NaCl后,SA溶液分为三个浓度区域,对应标度关系为η_(sp)~C、η_(sp)~C~(3/2)、η_(sp)~C~(39/10),两个临界浓度为C~*=0.04 wt%和C_e=0.4 wt%。加入外加盐后,SA分子链发生收缩,流体力学体积较少,导致增比粘度的浓度依赖性增强,临界浓度出现了明显的后移。另外,考虑到SA在工业应用中对应的多为缠结溶液,本文还着重研究了外加盐对SA浓溶液(2 wt%)体系的影响。在一定的盐浓度范围内,SA粘度随着盐浓度的升高而上升,当盐溶液浓度继续到一定的临近值,SA溶液发生分相,粘度出现下降。工艺条件(外加盐顺序)对于海藻酸钠的稳态流变行为产生显著的影响。在同等盐浓度下,先加盐的零切粘度显著高于加盐体系,并且前者分相时需要的盐浓度低于后者。
Sodium alginate(SA) is a polyanion electrolyte that is widely researched,can be used for medical,textile and food,etc.By addition of salt can influence its functionality and process ability.The viscosity as a function of concentration for SA in both salt-free solution and in 0.2MNaCl is investigated via rotational rheometer.In salt-free solution,four concentration regimes of viscosity scaling and three associated critical concentrations were observed.Four concentration regimes follow the scaling relations of η_(sp)~C,η_(sp)~C~(1/2),η_(sp)~C~(3/2) and η_(sp)~C~(7/2).Three associated critical concentrations was C~*=0.02 wt%,C_e=0.2 wt%and C_D=0.8 wt%.In salt solution,only three concentration regimes(η_(sp)~C,η_(sp)~C~(3/2),η_(sp)~C~(39/10)) and two critical concentrations(C~*=0.04 wt%,C_e=0.4 wt%) were observed.In the presence of salt,the polymer chain structure collapses and occupies much less space resulting in higher values of the critical concentrations.An increase in both C~* and C_e is observed in the presence of NaCl.In the range of salt concentration,the addition of monovalent salt increases the zero shear rate viscosity of the entangled polyelectrolyte solutions.When the concentration reaches to a critical value,concentration begin to separate the phase the viscosity decreases.Process conditions(adding salt order) influence Rheological Behaviors of Sodium Alginate.Under the same salt concentration,the zero shear rate viscosity of the adding salt first is higher than adding salt later and the salt concentration of separating phase is lower..
Sodium alginate(SA) is a polyanion electrolyte that is widely researched,can be used for medical,textile and food,etc.By addition of salt can influence its functionality and process ability.The viscosity as a function of concentration for SA in both salt-free solution and in 0.2MNaCl is investigated via rotational rheometer.In salt-free solution,four concentration regimes of viscosity scaling and three associated critical concentrations were observed.Four concentration regimes follow the scaling relations of η_(sp)~C,η_(sp)~C~(1/2),η_(sp)~C~(3/2) and η_(sp)~C~(7/2).Three associated critical concentrations was C~*=0.02 wt%,C_e=0.2 wt%and C_D=0.8 wt%.In salt solution,only three concentration regimes(η_(sp)~C,η_(sp)~C~(3/2),η_(sp)~C~(39/10)) and two critical concentrations(C~*=0.04 wt%,C_e=0.4 wt%) were observed.In the presence of salt,the polymer chain structure collapses and occupies much less space resulting in higher values of the critical concentrations.An increase in both C~* and C_e is observed in the presence of NaCl.In the range of salt concentration,the addition of monovalent salt increases the zero shear rate viscosity of the entangled polyelectrolyte solutions.When the concentration reaches to a critical value,concentration begin to separate the phase the viscosity decreases.Process conditions(adding salt order) influence Rheological Behaviors of Sodium Alginate.Under the same salt concentration,the zero shear rate viscosity of the adding salt first is higher than adding salt later and the salt concentration of separating phase is lower..
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