Study of rheological property of nylon‐1212 with Haake Rheometer

Abstract

Rheological properties of nylon-1212 have been studied by means of Haake Rheometer. The effect of shear rate and temperature on the apparent vicosity of nylon-1212 was discussed. A correlation of non-Newtonian index with the temperature was obtained. The results showed that the apparent viscosity decreases with the increase of the temperature. With increasing shear rate, shear thinning of nylon-1212 was observed clearly. From the relation of the temperature dependence of the polymer, we obtained the viscous flow activation energy. We conclude that the apparent viscosity is sensitive to temperature at lower shear stress because of higher viscous flow activation energy, and the temperature affect on the apparent viscosity becomes weaker at higher shear stress because of lower viscous flow activation energy. We have investigated the creep and elastic recovery of nylon-1212. A creep test was carried out to define the linear viscoelastic range as 1.0 and 5.0 Pa for 195 and 190°C nylon-1212 melts, respectively. A time-dependent response was found for the creep and recovery phases at a lower applied shear stress. However, at higher shear stress, the creep and recovery phases were time-independent.

Rheological behavior of semi‐aromatic transparent polyamide

“…As indicated, lgτ decreases with increasing flow temperature, i.e., SATPA decreases with elevated temperature. This deviation from Newtonian behavior has been found in other sorts of nylons 16, 17…”

Melt reaction of zein with glyoxal to improve tensile strength and reduce solubility

“…7(A)]. This result is in good agreement with other polymer systems 23, 26, 27. On examination of the resulting plot, it can be seen that the discontinuity described above is also seen here.…”

“…This result is in good agreement with other polymer systems. 23,26,27 On examination of the resulting plot, it can be seen that the discontinuity described above is also seen here. The initial torque values for the higher temperatures provided a better exponential fit than those values taken at lower temperatures.…”

Rheological Studies Utilizing Various Lots of Zein in N,N-Dimethylformamide Solutions

“…Once again, the viscosities of lot 3121 and lot 2371 were more similar than that of lot 3111. By plotting the natural logarithm of the viscosity data detailed in Table 2 vs reciprocal temperature (K), the E act of flow will be the slope of the line after multiplying by negative 1, the gas constant, and correcting for the units (Figure 3) (25,26). When this is performed, the resulting E act values of flow for the three zein samples are as follows: Lot 3121 is 38.0 kJ/mol, lot 2371 is 41.7 kJ/mol, and lot 3111 is 26.9 kJ/mol.…”