By Hartman, E.F.; Sandia National Laboratories.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information
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1000 I I . I . A ? 14 Variation of polyethylene density with crystallinity, with boundaries of PE classes. where for polyethylene at 25~ pc = 1000kg m-3 and Pa = 8 5 4 k g m -3. 14 shows the variation of density versus crystallinity with the regions of HDPE, LDPE and polyolefin copolymer elastomers. The melt flow index (MFI) is used as a production control assessment of the average molecular weight. 15 49 Melt Flow Indexer used for the quality control of polymer molecular weight. under specific conditions, so as the MFI increases, the polymer melt should flow more easily.
Chain branches cannot easily be accommodated in polymer crystals, so the percentage crystallinity decreases as the amount of comonomer increases (Fig. 13). To estimate the volume fraction crystallinity, it is quicker to measure density than to use X-ray methods. e. the defect population inside the crystals that affects the density, is constant. As this assumption is not quite valid, crystallinity values vary by a few %, depending on the method of measurement. 7. I. I Densityand melt flow index The mass of crystals in 1 m 3 of polymer is the product of the volume fraction crystallinity, Vc and the crystal density pc.
To experimentally verify Eq. 3), it needs to be expressed in terms of measurable quantities. 7 Histogram of end-to-end vector lengths for 1000 random walks of 100 steps, on a diamond lattice. The curve represents the theory of Eq. 13). 5) so rg is related to the mean square end-to-end length. 6) The molecular weight dependence of rg for polymethylmethacrylate (PMMA), both in the glassy state and in dilute solution, agrees with the form of Eq. 6) (Fig. 8), but the experimental values are about twice the theoretical values.