Amorphous layer thickness

This intensity can be used to calculate the correlation fiinction (Bl.9.101) and the interface distribution fiinction (B 1.9.102) and to yield the lamellar crystal and amorphous layer thicknesses along the fibre. 

Figure 6. Strain at break as a function of amorphous layer thickness for two PE differing by molar mass (M y).

As pointed out above, the semicrystalline polymer can be considered as a two-phase composite of amorphous regions sandwiched between hard crystalline lamellae (Fig. 4.2(a)). Crystal lamellae ( c) are normally 10-25 nm thick and have transverse dimensions of 0.1-1 pm while the amorphous layer thickness, a, is 5-10 nm. As mentioned in the previous section, melt-crystallized polymers generally exhibit a spherulitic morphology in which ribbon-like lamellae are arranged radially in the polycrystalline aggregate (Bassett, 1981). Since the indentation process involves plastic yielding under the stress field of the indenter, microhardness is correlated to the modes of deformation of the semicrystalline polymers (see Chapter 2). These... 

SMA14 interlamellar amorphous layer thickness SAXS [Vanneste, 1993]... 

PVDF/PMMA ns interlamellar, interfibrillar or interspherulitic amorphous layer thickness SAXS, OM [Morra etal, 1982 and 1984 Stein et al, 1981]... 

Figure 9.17 The crystalline lamellar thickness and the amorphous layer thickness plotted against the propylene-unit content of EP copolymers in iPP/EP (80/20) blends. (From Reference 37 with permission from Elsevier Ltd.)...

Shieh et al. [130] probed the C02-induced morphological alterations in a poly(-ethylene oxide)/poly(methyl methacrylate) blend using small-angle X-ray scattering (SAXS). The crystal and amorphous layer thickness of PEO was found to increase following exposure to CO2, and the extent of the layer thickening was found to be controlled by the fraction of PMMA in the blend. The increase in thickness of the lamellae was attributed to recrystaUization of the PEO domains. 

X-ray Data During Crystallization of PE Cryst. an l Amorphous Layer Thickness... 

SAN15 Interlamellar Amorphous layer thickness SAXS Vanneste and Groeninckx (1995)... 

Fig.63. Dependencies of long period, L ( ), lamellar thickness, 1 ( ) and amorphous layer thickness, (O) with PCL content in blends of PCL with oligo-PS taken from [145]...

Fig. 79. Pseudo two-phase model showing the variation in density through the alternating crystalline and amorphous layers thickness C of the crystalline layer is (n-E) and thickness A of the amorphous layer is (n-E) where E is the thickness of the transition layer taken from [60]...

The crystal and amorphous layer thicknesses were obtained from eqns [2] and [3] ... 

The three distances extraaed from the ID autocorrelation function, such as the crystal and amorphous layer thicknesses and the interphase width, are shown in the bottom panel of Figure 24. Apart from the constancy of the interphase width,... 

The weight-average values of the aystalline and amorphous layer thickness, (Lc) and (LJ, are shown in Figure 34. 

The long period, the crystalline and amorphous layer thicknesses and the bulk volume crystallinity were obtained from an analysis of the correlation functions, an example is shown in Fig. 7.12b. The correlation function is defined as ... 

Figure 7.13 shows the variation of long period and crystalline/amorphous layer thicknesses with increase content of graphene nanoflakes. From this, is it possible to observe that the graphene induces a thickening of the soft layer (Ab), leading to an increase of the long period, Lp and a reduction of bulk crystallinity. 

Equatorial scattering curves were extracted from the 2D SAXS patterns and the correlation functions were obtained, as displayed in Fig. 7.25. Clearly the processing of PCL at higher extruder temperatures did not induce significant changes in the crystalline and amorphous layer thicknesses, as shown in Fig. 7.26. We attribute this to the fact that the crystallisation takes place at a... 

Figure 7 PE Change of the amorphous layer thickness with T.

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