Dynamic rheological behavior of polyfluorinated ethylene propylene/polypropylene blend melts. (February 2017)

• Record Type: Journal Article
• Authors: Liang, JZ; Peng, W; Wang, KJ
• Is Part Of: Journal of thermoplastic composite materials. Volume 30:Number 2(2017:Mar.)
• Page Start: 273
• Page End: 285
• Publication Date: 2017-02
• Subjects: Polymer blends -- dynamic shear flow -- melt rheology -- viscoelasticity; Thermoplastic composites -- Periodicals; 668.423
• DOI: 10.1177/0892705715598363
• Languages: English
• ISSNs: 0892-7057

Abstract

The polyfluorinated ethylene propylene (FEP)/polypropylene (PP) blend was compounded at melt state in a twin-screw extruder. The melt dynamic viscoelasticity of FEP/PP blends was measured using a Bohlin rheometer with the extended temperature option under experimental conditions with temperature scope from 270°C to 280°C and shear frequency ( ω ) varying from 10 −2 to 10 1 s −1 . The results showed that the shear storage modulus ( G ′) and shear loss modulus ( G ″) increased nonlinearly, while the dynamic complex viscosity ( η *) decreased slightly with increasing ω . The G ′ and G ″ were an exponential function of ω . The G ′, G ″, and η * of the blend melts decreased with an addition of the PP weight fraction( φ PP ), and the relationship between them might be expressed by a multinomial third-order equation. This phenomenon might be attributed to the difference in viscoelasticity between the FEP melt and PP melt. The value of tan δ of the blend melts achieved the maximum at about 10 0 s −1 .