Viscoelastic Properties of Polymer Blends in Miscible and Immiscible States

混溶和不混溶状态下聚合物共混物的粘弹性

基本信息

批准号：
04453105
负责人：
NODA Ichiro
金额：
$ 5.06万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453105/
关键词：
Viscoelastic properties Polymer blends Miscible state Immiscible state Newtonian fluid mixtures Vicinity of phase separation Textured materials Shear-induced homogenization ポリスチレンポリビニルメチルエーテル textured material スケーリング則

项目摘要

Viscoelastic properties of polymer blends were studied in 1) miscible and 2) immiscible states, and 3) a vicinity of phase separation as follows :1) zero-shear viscosity etaﾟ and steady-state compliance J_e of polystirene/poly(vinyl methylether)(PS/PVME) blends in the miscible state were measures as functions of the molecular weight and composition of PS (M_<PS> and phi_<PS>) in the condition that M_<PS>>>M_<PVME> where M_<PVME> is the molecular weight of PVME.It was found that the etaﾟ of the polymeer blends in the semidilute region where phi_<PS><0.2, can be expressed by the same scaling law as semidilute polymer solutions, and the J_e almost agrees with that of polymer solutions. 2) Viscoelastic properties of silicone oil/liquid resin blends as a model of Newtonian fluid mixtures and polydimethylsiloxane/polybutadiene blends as a model of polymer blends were measured in the immiscible state. It was found that the shear stresses and normal stress differences of these blends are well explained by the theory of textured materials presented by Doi and Ohta, if the stresses of the component polymers are subtracted. 3) Viscoelastic properties of PS/PVME blends with the nearly critical compositions in steady-shear flow were studied in the vicinity of phase separation temperature. It was found that the shear rate dependences of viscosity eta and compliance J_s in the homogeneous region are almost the same as those of homopolymers, but the eta and J_s in the phase-separated region are enhanced at low shear rates and become consistent with those in the homogeneous region, when the shear rates are higher than their respective critical values, implying shear-induced homogenization.

研究了聚合物共混物在 1) 混溶状态和 2) 不混溶状态以及 3) 相分离附近的粘弹性特性，如下所示：1) 聚苯乙烯/聚（乙烯基甲基醚）的零剪切粘度 etaﾟ和稳态柔量 J_e (PS/PVME) 混溶状态的共混物是作为 PS 的分子量和组成的函数来测量的 (M_<PS> 和phi_<PS>)，条件是 M_<PS>>>M_<PVME>，其中 M_<PVME> 是 PVME 的分子量。发现聚合物共混物的 etaﾟ处于半稀释区域，其中 phi_<PS ><0.2，可以用与半稀聚合物溶液相同的标度律来表示，并且J_e与聚合物溶液的J_e几乎一致 2）有机硅的粘弹性能。油/液体树脂共混物作为牛顿流体混合物的模型和聚二甲基硅氧烷/聚丁二烯共混物作为聚合物共混物的模型在不混溶状态下进行了测量，发现这些共混物的剪切应力和法向应力差异可以通过理论得到很好的解释。 Doi 和 Ohta 提出的纹理材料，如果减去组分聚合物的应力 3) PS/PVME 共混物的粘弹性特性，其成分几乎是关键的。对相分离温度附近的稳态剪切流进行了研究，发现均匀区域中粘度eta和柔量J_s的剪切速率依赖性与均聚物几乎相同，但相分离区域中的eta和J_s。当剪切速率高于各自的临界值时，分离区域在低剪切速率下增强，并与均匀区域中的区域一致，这意味着剪切引起的均质化。