Suksamranchit Siriluck, Sirivat Anuvat, Jamieson Alexander M
The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand.
J Colloid Interface Sci. 2006 Dec 15;304(2):497-504. doi: 10.1016/j.jcis.2006.09.028. Epub 2006 Sep 16.
The influence of polyethylene oxide (PEO) on the rheological properties of equimolar wormlike micellar solutions of hexadecyltrimethylammonium chloride (HTAC) and sodium salicylate (NaSal) is investigated, above the concentration where a micellar entanglement network is formed. PEO is known to have a temperature-dependent binding affinity for HTAC micelles. The influence of temperature, PEO concentration, and HTAC concentration is explored. Within the concentration and temperature range examined (25-100 mM HTAC and 25-50 degrees C), HTAC/NaSal solutions exhibit rheological characteristics of an entanglement network. Application of transient network theory provides information in the form of the plateau modulus, G(infinity)', the terminal viscoelastic relaxation time, tau(R), the reptation time, tau(rep), the micellar breaking time, tau(br), the mean micellar length, L , and the entanglement length, l(e). Consistent with literature data, increase of HTAC concentration results in an evolution from slow-breaking to fast-breaking behavior, accompanied by an increase in G(infinity)' and tau(rep), and decreases in tau(R), and tau(br), l(e) and L . Addition of PEO results in a substantial decrease in G(infinity)' (increase in l(e)), and corresponding increases in tau(R) and L . These observations are consistent with the idea that binding of HTAC micelles to PEO in aqueous solution decreases the number of surfactant molecules available to contribute to the entanglement network of wormlike micelles.
研究了聚环氧乙烷（PEO）对十六烷基三甲基氯化铵（HTAC）和水杨酸钠（NaSal）等摩尔蠕虫状胶束溶液流变性质的影响，该研究在形成胶束缠结网络的浓度以上进行。已知PEO对HTAC胶束具有温度依赖性结合亲和力。探讨了温度、PEO浓度和HTAC浓度的影响。在所研究的浓度和温度范围内（25 - 100 mM HTAC和25 - 50℃），HTAC/NaSal溶液表现出缠结网络的流变特性。应用瞬态网络理论可提供以下信息：平台模量G(∞)'、末端粘弹性松弛时间τ(R)、爬行时间τ(rep)、胶束破裂时间τ(br)、平均胶束长度L和缠结长度l(e)。与文献数据一致，HTAC浓度的增加导致从慢破裂行为向快破裂行为的转变，同时伴随着G(∞)'和τ(rep)的增加，以及τ(R)、τ(br)、l(e)和L的减小。添加PEO会导致G(∞)'大幅降低（l(e)增加），以及τ(R)和L相应增加。这些观察结果与以下观点一致：在水溶液中，HTAC胶束与PEO的结合减少了可用于形成蠕虫状胶束缠结网络的表面活性剂分子数量。
