Macromolecular Rapid Communications

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Recently Published Articles

  1. Comparison of Loading Efficiency between Hyperbranched Polymers and Cross-Linked Nanogels at Various Branching Densities

    Robert W. Graff, Yi Shi, Xiaofeng Wang and Haifeng Gao

    Article first published online: 27 AUG 2015 | DOI: 10.1002/marc.201500388

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    The encapsulation efficiency of alkynyl-containing dendron molecules into azido-containing hyperbranched polymers and cross-linked nanogels is explored. Hyperbranched polymers with “T”-shaped branching linkage represent a more open branched structure and have achieved higher loading efficiency (i.e., higher conversion) of dendron molecules than cross-linked nanogels that carried “X”-shaped branching linkage.

  2. Conditional Ultrasound Sensitivity of Poly[(N-isopropylacrylamide)-co-(vinyl imidazole)] Microgels for Controlled Lipase Release

    Radovan Vukićević, Axel T. Neffe, Karola Luetzow, Benjamin F. Pierce and Andreas Lendlein

    Article first published online: 27 AUG 2015 | DOI: 10.1002/marc.201500311

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    Microgels with environmentally dependent swelling are found to be fragmented upon ultrasonication only in their maximum observed swollen state. This state is observed for crosslinked poly(NIPAAM-co-vinylimidazole) microgels at low pH (4.7) and below 30 °C. This conditional ultrasound-sensitivity can be used to achieve an on-demand release of a lipase embedded in the microgels.

  3. Influence of Diurethane Linkers on the Langmuir Layer Behavior of Oligo[(rac-lactide)-co-glycolide]-based Polyesterurethanes

    Anne-Christin Schöne, Klaus Richau, Karl Kratz, Burkhard Schulz and Andreas Lendlein

    Article first published online: 26 AUG 2015 | DOI: 10.1002/marc.201500316

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    Diurethane junction units do not influence the Langmuir film behavior of oligo[(rac-lactide)-co-glycolide] based polyesterurethanes at the air–water interface. But, compared to the nonsegmented poly[(rac-lactide)-co-glycolide], the evolution of morphological structures in the co-existence state visualized by Brewster angle microscopy is retarded by the urethane linkers regardless the hydrophilicity of the used diisocyante moieties.

  4. Solvent Effects on Acrylate kp in Organic Media: A Response

    Michael Buback

    Article first published online: 26 AUG 2015 | DOI: 10.1002/marc.201500328

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    The PLP–SEC method allows the accurate measurement of kp, the propagation rate coefficient of radical polymerization. Differences in bulk and solution kp are found in cases where the polarity and/or the size of monomer and solvent molecules are different. The entropic origin of solvent effects on kp is adequately understood in terms of fundamental kinetic theory.

  5. Solvent Effects on kp in Organic Media?: Statement to the Response

    Alexander P. Haehnel, Benjamin Wenn, Katrin Kockler, Tobias Bantle, Andrea M. Misske, Friederike Fleischhaker, Thomas Junkers and Christopher Barner-Kowollik

    Article first published online: 26 AUG 2015 | DOI: 10.1002/marc.201500416

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    We respond to a recent response on a publication from our team investigating solvent effects on propagation rate coeffi­cients. Among other issues, we point to the fact that the response interprets only a subset of the data provided in our original contribution.