Affiliation:
1. School of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao China
2. Research and Development Center Northwest Rubber & Plastics Research & Design Institute Co., Ltd. Xianyang China
Abstract
AbstractThe flow behavior of triblock copolymer polystyrene‐polyisoprene‐polystyrene (SIS) was different below and above the viscous flow transition temperature (Tf). The study investigated the relationship between molecular structure (molecular weight and polystyrene block content) and the macroscopic rheological properties of SIS melt around Tf via capillary rheometer. The results indicated that below the Tf, shear viscosity of SIS melt was controlled by the polystyrene (PS) block content. On the other hand, above the Tf, shear viscosity was controlled by molecular weight. The rheological phenomena were explained based on the state change of the PS domains below and above Tf. The effect of PS block content on the viscous flow activation energy (Eη) and pressure drop of SIS melt was also investigated.
Funder
Natural Science Foundation of Shandong Province
Subject
Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry