caa a22 4500 467951721 CHVBK 20180322200726.0 cr unu---uuuuu 170328e19861101xx s 000 0 eng 10.1007/PL00020271 doi (NATIONALLICENCE)springer-10.1007/PL00020271 (NATIONALLICENCE)springer-10.1007/BF02431641 Stiff and strong polyethylene with shish kebab morphology by continuous melt extrusion [Elektronische Daten] [Z. Bashir, J. Odell, A. Keller] In a previous work, it was shown that highly oriented fibres with 10 GPa modulus could be obtained by continuous single-stage melt extrusion of a medium molecular weight polyethylene to which 3% ultra-high molecular weight (M w ∼ 3 to 5 × 106) material had been added by solution blending. It was demonstrated that a special interlocking shish kebab structure was responsible for the favourable mechanical properties. In the present work, we succeeded in achieving the same effect from an unblended polyethylene by choosing starting materials with an inherently suitable molecular weight distribution. Both the high and low molecular weight tails of the distribution are very influential: the high tail contributes to the formation of extended-chain fibrils (which constitute the backbones of the shish kebabs), while the low tail affects melt extrudability and strength. Melt strength is important because unusually high tensile stresses are required during wind-up. The wind-up stress was measured and found to be an order of magnitude greater than that encountered in conventional melt spinning — where no shish kebabs are formed. The implications of the above findings for polymer processing, crystal morphology and melt rheology are discussed. Chapman and Hall Ltd., 1986 Bashir Z. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut Odell J. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut Keller A. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 3993-4002 0022-2461 21:11<3993 1986 21 10853 https://doi.org/10.1007/PL00020271 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00020271 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bashir Z. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut NATIONALLICENCE 700 1- Odell J. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut NATIONALLICENCE 700 1- Keller A. H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Av, BS8 1TL, Bristol, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 3993-4002 0022-2461 21:11<3993 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02431641 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer