Viscoelastic properties and interfacial tension of polystyrene-polyethylene blends

Investigating the morphology/rheology interrelationships in immiscible polymer blends

“…The maximum shear Tates were obtained at the end of each creep experiment and were calculated to be 2.44 x 10 -3 , 1.11 x 10 -2 , and 2.62 x 10 -2 s -1 for tests at 25, 100, and 200 Pa, respectively For this range of shear rates, the PS and the HDPE can be assumed to be Newtonian fluids. Using the zeroshear values of Table I, the viscosity ratio p is equal to 0.35 and the interfacial tension was estimated using the breaking thread method as 4 7 mN/m [Mekhilef et al (2000)]. From Grace (1982), a value of Ca c equal to approximately 0.65 is obtained.…”

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

“…It is inversely proportional to interfacial tension and proportional to R. The identification of a third relaxation time in the relaxation spectrum of the blend can therefore enable the evaluation of interfacial or blend morphology. Some studies have shown that there might be an influence of blend composition on the determination of interfacial tension between the components of the blend using dynamic data [11][12][13][14][15][16]. Lacroix et al [11] observed that the values of interfacial tension obtained fitting Palierne's model to linear viscoelastic data of blends of polyethylene terephthalate copolymer(PETG)/ethylene vinyl acetate (EVA) depended on blend composition.…”

Temperature and Weight Dependence of Free Volumes in Conducting Composite Polymer Using Positron Annihilation Techniques

“…Using experimental density measurement of the PVdFco-HFP with molecular weights [21], we fitted the density data at ambient pressure and obtained the following relations for the temperature from 313 to 373 K: ln V .m 3 =kg/ D ln V˛C˛T T .K/ ln V˛D 7:724 and˛T D 0:822 10 3 K 1 for 321 Da and ln V˛D 7:737 and˛T D 0:880 10 3 K 1 for 471 Da with the correlation coefficient squared 0.9863 and 0.9926 of the linear regression, respectively. We find that the thermal expansion of the PVdF-co-HFP for 400 Da (our sample molecular weight) is approximately˛T D 0:851 10 3 K 1 .…”