Molecular weight dependence of shear viscosity of a polymer monolayer : Evidence for the lack of chain entanglement in the two-dimensional plane
Molecular weight dependence of shear viscosity of a polymer monolayer : Evidence for the lack of chain entanglement in the two-dimensional plane
复制标题
聚合物单层剪切粘度的分子量依赖性：二维平面中缺乏链缠结的证据
DOI：
10.1021/ma971176x
复制
发表时间：
1998
期刊：
影响因子：
5.5
通讯作者：
Masahide Yamamoto
中科院分区：
文献类型：
--
作者：
N. Sato;S. Ito;Masahide Yamamoto
在空气/水界面处的单分子膜作为提供可行的准二维空间的系统已被广泛研究。1-4特别是，聚合物单分子膜是感兴趣的，因为由于在界面处的聚合物链的受限构象的空间维度的突出效果。高分子材料的力学性能与高分子链的形态有关。如对于本体聚合物已知的，粘度取决于分子量，并且依赖程度在某一临界分子量Mc下改变。5在高分子量区域的强依赖性被解释为聚合物的链缠结的影响。通过与三维情况下的类比，单层粘度的分子量依赖性的调查将提供在二维平面上的聚合物链形态的信息：聚合物链是否可以相互缠结在空气/水界面。分子量对聚合物单分子膜力学性能的影响已经被一些研究者研究过。6-9一般认为，聚合物的分子量越高，弹性和粘度越高。然而，很少有研究的力学性能方面的高分子链形态。在这项研究中，我们研究了分子量依赖的粘度的聚合物单分子膜使用管道表面粘度计。这项研究将澄清在二维平面上的链形态。
Monolayers at the air/water interface have been widely studied as a system providing a feasible quasi two-dimensional space. 1-4 In particular, polymer monolayers are of interest because of the prominent effect of the space dimensionality owing to the restricted conformation of the polymer chain at the interface. Mechanical properties of polymeric materials are related to the polymer chain morphology. As known for the bulk polymers, the viscosity depends on the molecular weight, and the degree of dependence is altered at a certain critical molecular weight Mc. 5 The strong dependence in the high molecular weight region is explained as the effect of the chain entanglement of the polymers. By the analogy with the three-dimensional case, investigation on the molecular weight dependence of the monolayer viscosity will provide information on the polymer chain morphology in a two-dimensional plane: whether the polymer chains can entangle each other at the air/water interface. Molecular weight effects on the mechanical properties of polymer monolayers have been investigated by several researchers. 6-9 It is generally accepted that the higher molecular weight of the polymers gives rise to higher elasticity and higher viscosity. However, there are few studies on the mechanical properties in terms of the polymer chain morphology. In this study, we investigated the molecular weight dependence of the viscosity of polymer monolayers using the canal surface viscometry. This study will clarify the chain morphology in the two-dimensional plane.