Melt viscosity ratio

Everaert V, Aerts L, Groeninckx G (1999) Phase morphology development in immisdble PP/(PS/PPE) blends influence of the melt-viscosity ratio and blend composition. Polymer 40 6627-6644... 

FIGURE 2.2 The dependence of nanocomposite and matrix polymer melt viscosities ratio (ri /ri ) on nanofiller volume contents (1 + q)J (1) for nanocomposites HDPE-CaCOj. 

FIG U RE 12 The dependence of nanocomposite and matrix polymer melt viscosities ratio... 

For PDMSs with molar mass in the range of 1600-24000gmor, melt viscosity ratios r Jt were determined in the range of 0.45-0.5 as predicted by theory. ... 

In general, for best impact modification, the ethylene-propylene copolymer must have >30 % propylene and show essentially no crystallinity (Rifi et al. 1987). The size and distribution of the EP rubber particles in the polypropylene matrix depend on the molecular weights and the melt viscosity ratio between the two polymers, as... 

Moreover, the melt viscosity (or polymer molecular weight) also acts on the general phase morphology, since the component of lower viscosity has marked tendency to encapsulate the second component in binary blends. As a rule, the composition at which the phase inversion occms is governed by the melt viscosity ratio, as predicted by the Jordhamo s equation [77]. 

Figure 7.8 Dimensionless domain size as a function of melt viscosity ratio...

APHA color (269) is usually one of the specifications of PTMEG, sometimes viscosity is another (270). Melt viscosity at 40°C is often used as a rough measure of the molecular weight distribution within a narrow molecular weight range. Sometimes an empirical molecular weight ratio,... 

As with resoles, the central issue in design of novolacs is molecular weight. The effects of formaldehyde-to-phenol molar ratio and formaldehyde conversion on molecular weight of novolacs has been well studied and reported [192,193]. The effects of molecular weight on most of the important properties are also available [193]. These include Tg, melt viscosity, gel time, hot-plate flow, glass-plate flow. 

Variations of melt viscosity with the blend ratio for both the preblends and preheated blends are shown in Fig. 

Variation of melt viscosity for both the preblends and preheated blends with the blend ratio are shown in Fig. 19. There are two distinct regions in viscosity change with the addition of polyacrylic rubber (ACM) in the blends. First, in the higher shear rate region, the viscosity increases with the addition of the ACM (up to 40% ACM) in the blend and then it decreases. In the lower... 

From the y(jc) functions and the two melt temperatures used, and by using the viscosity curves from rheological examinations (Fig. 11), viscosity distributions T](jc) of the two pure components were easily determined, as shown in Figs. 15a and 15b. Subsequently, the viscosity ratio functions 6(jc) were also calculated (Fig. 16). All four curves fall slightly from the core to the outside. 

FIGURE 4 Melt viscosity versus weight average molecular weight of a polymer prepared from 3,9-bis(ethylidene-2,4,8,10-tetraoxaspiro-[5,5]undecane) and a 70 30 mole ratio of trans-cyclohexane dimethanol and 1,6-hexanediol measured at 150 C. (From Ref. 14.)... 

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