3 years ago

Viscoelastic and Dynamic Properties of Well-Mixed and Phase-Separated Binary Polymer Blends: A Molecular Dynamics Simulation Study

Viscoelastic and Dynamic Properties of Well-Mixed and Phase-Separated Binary Polymer Blends: A Molecular Dynamics Simulation Study
Raghavan Ranganathan, Wei Peng, Rahmi Ozisik, Pawel Keblinski
The viscoelasticity and dynamic properties of a model dynamically asymmetric binary polymer blend are studied via molecular dynamics simulations. The model blend system is made up of two chain types having a large glass transition temperature (Tg) difference and presents two blend morphologies: a well-mixed, homogeneous blend and a phase-separated blend. These two morphologies represent dynamically coupled and dynamically confined states. The well-mixed, homogeneous blend exhibited greater storage modulus and slower low-Tg matrix chain dynamics compared to the phase-separated blend. The influence of various system parameters, such as high-Tg chain length and (volume) concentration, and shear frequency on various static, dynamic, and viscoelastic properties is investigated to identify the source of the observed stiffening in the well-mixed, homogeneous blends.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b00657

DOI: 10.1021/acs.macromol.7b00657

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