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Full Paper: Aqueous solution of poly(ethylene oxide)-block-poly(propylene oxide) diblock copolymers (E 102 P 37 and E 92 P 55 ) are studied by rheology. Storage and loss modulus as well as yield stress are used to detect and characterise hard and soft gels in a concentration range between 4 and 28 wt.-% copolymer at temperatures between 5 and 85 8C (see phase diagram in the Figure ). The phase diagrams of related block copolymers are compared with the results, revealing that the mesophase behaviour of the systems presented here depend on the effective thickness of the E-block corona and the stability of the micelles at low temperature.
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Full Paper: Copolymerizations of ethylene with 1,7-octadiene (OD) and 1,9-decadiene (DD) are conducted in the presence of various non-bridged and bridged zirconocene catalysts using methylisobutylaluminoxane as the cocatalyst. In the case of ethylene/OD copolymerization, the ligand structure of the
When conducted in suitable conditions, the polymerization of ethylene in the presence of 1,4-bis(2,6-diisopropylphenyl)acenapththenediiminenickel(II) dichloride (1) and methylaluminoxane (MAO) produces hyperbranched polyethylene (HBPE). The product shows high molecular weight and more than 218 branc