MELT ELONGATION

Eig. 34. Diagram of the Rheometric Melt Elongational Rheometer (RME) for elongational viscosity measurements on polymer melts. 

As a route for improving the melt-elongational properties of semicrystalline polymers, Siripurapu et al. [7] proposed the blending of amorphous and semicrystalline blends of PS and PVDF nevertheless, their approach showed only limited success. In contrast, Reichelt et al. [29] successfully developed blends of HMS-PP and PP-fe-PE block copolymers. As could be shown, the melt strength increases with the HMS-PP content, while blends rich in HMS-PP also show the lowest densities. 

Correlation between blend morphology, melt-elongation, and foaming behavior — despite the significant influence only addressed for neat polymers [38], miscible blends [4, 5], and some filled systems [39,40]... 

Fig. 9 Melt elongational behavior of PPE/SAN blends at 180°C. (a) Rheotens curves, (b) Apparent elongational viscosity, as calculated by [57] (reprinted from [47])...

Gramespacher H and Meissner J (1997) Melt elongation and recovery of polymer blends, morphology, and influence of interfacial tension. J Rheol 41 27-44. 

Linster, J. J., and J. Meissner. 1986. Melt elongation and structure of linear polyethylene (HOPE). Polymer Bulletin 16 187-194. 

M.H. Wagner, S. Kheirandish, M. Yamaguchi, Quantitative analysis of melt elongational behavior of LLDPE/LDPE blends. Rheoi. Acta 44(2), 198-218 (2004)... 

Handge, U.A. and Potschke, P. (2004) Interplay of rheology and morphology in melt elongation and subsequent recovery of polystyrene/poly(methyl methacrylate) blends. J. Rlteol., 48 (5), 1103-1122. 

J. Meissner, Experimental aspects in polymer melt elongational rheometry, Chem. Eng. Commun. 33, 159-180 (1985). 

J. Meissner, Polymer melt elongation—methods, results, and recent developments, Polym. Eng. Sci. 27, 537-546 (1987). 

T. Raible, A. Demarmels, and J. Meissner, Stress and recovery maxima in LDPE melt elongation, Polym. Bull. 1, 397-402 (1979). 

Table 6 Basic properties of metallocene copolymers and reference LDPE characterized with the melt elongational measurements...

We use ID and 2D compression methods. In the case of ID compression, we keep the width of the sample constant during compression. In the case of 2D compression, we compress a rod sample into a disk. The degree of melt elongation can be quantitatively expressed by e, which... 

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