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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能，具体如下：1）在混溶状态下，测量了聚苯乙烯/聚乙烯基甲基醚（PS/PVME）共混物的零剪切粘度eta和稳态柔量J_e，作为PS分子量和组成的函数（M_<PS>和phi_<PS>），条件是M_<PS>>>M_<PVME>，其中M_<PVME>是PVME的分子量。发现聚合物共混物在半稀释区（其中phi_<PS><0.2）的eta可以用与半稀释聚合物溶液相同的标度律表示，并且J_e与聚合物溶液的J_e几乎一致。2)以硅油/液体树脂共混物为牛顿流体模型，以聚二甲基硅氧烷/聚丁二烯共混物为聚合物共混物模型，测定了两种共混物在不混溶状态下的粘弹性能。研究发现，如果减去组分聚合物的应力，这些共混物的剪切应力和法向应力差可以用Doi和Ohta提出的织构材料理论很好地解释。3)研究了具有近临界组成的PS/PVME共混物在相分离温度附近的稳态剪切流变粘弹性能。结果表明，在均相区，粘度η和柔度J_s与剪切速率的关系与均聚物基本相同，但在相分离区，η和J_s在低剪切速率下增大，当剪切速率高于其临界值时，η和J_s与均相区的一致，表明存在剪切诱导的均匀化现象。