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- 저자 : Kaschta, Joachim (검색결과 1 건)
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Synthesis and Characterization of Novel Ethylene-<i>graft</i>-Ethylene/Propylene Copolymers
Stadler, Florian J.,Arikan-Conley, Burç,ak,Kaschta, Joachim,Kaminsky, Walter,Mü,nstedt, Helmut American Chemical Society 2011 Macromolecules Vol.44 No.12
<P>A sequential metallocene-catalyzed synthesis of ethylene/propylene macromers, which are subsequently incorporated into growing polyethylene chains, leads to comb-like polymers. After the synthesis, a Soxhlet extraction ensures the purity of the sample. The GPC-MALLS analysis reveals narrowly distributed samples with a non-negligible degree of branching. The comb polymers show a very high viscosity, which significantly differs from conventional long-chain branched metallocene polyethylenes (LCB-mPE) but is in agreement with findings on comb model polymers. The zero shear rate viscosity η<SUB>0</SUB> lies significantly above the relation between <I>M</I><SUB>w</SUB> and η<SUB>0</SUB> for linear and for conventional LCB-mPE. The thermorheological behavior is complex and differs from that observed for LCB-mPE but also does not resemble an LDPE-like thermorheological behavior.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2011/mamobx.2011.44.issue-12/ma200588r/production/images/medium/ma-2011-00588r_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma200588r'>ACS Electronic Supporting Info</A></P>
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