Macromolecular Chemistry and Physics

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  1. Grafting Polymers from Poly(2,6-dimethyl-1,4-phenylene oxide) as New Thermoplastics

    Jiuyang Zhang and Peng Wu

    Version of Record online: 24 MAR 2017 | DOI: 10.1002/macp.201700023

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    In this paper, a kind of thermoplastics based on graft polymers from poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is designed. PPO-graft polymers show unique properties in various aspects, such as rheological and mechanical behaviors. The graft density shows impact on the relaxation properties of the thermoplastics. This work provides the possibility to use lots of semiflexible engineering polymers as backbones to construct new thermoplastics.

  2. Main-Chain Polyimidazolium Polymers by One-Pot Synthesis and Application as Nitrogen-Doped Carbon Precursors

    Konrad Grygiel, Sarah Kirchhecker, Jiang Gong, Markus Antonietti, Davide Esposito and Jiayin Yuan

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/macp.201600586

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    The Debus–Radziszewski reaction is used for the one-pot synthesis of main-chain imidazolium-containing polymers from simple organic compounds. This paper finds that via anion-metathesis reaction to replace the acetate anion with dicyanamide, the thermal properties of the main-chain polyimidazoliums are improved and one of these polyimidazoliums presents an unusually high carbonization yield of up to 66 wt% at 900 °C.

  3. Addition Oligomerization of Dicyclopentadiene: Reactivity of Endo and Exo Isomers and Postmodification

    Giorgia Zanchin, Giuseppe Leone, Ivana Pierro, Arnaldo Rapallo, William Porzio, Fabio Bertini and Giovanni Ricci

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/macp.201600602

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    TiCl4/Et2AlCl is an active catalyst for the addition oligomerization of dicyclopentadiene. A crystalline tetramer is obtained from the endo dicyclopentadiene isomer which is less reactive than the exo isomer, while it exhibits a reactivity close to that of dihydrodicyclopentadiene. The postoligomerization modification through hydrogenation and epoxidation is explored and materials with tunable thermal properties are produced.

  4. A Stimuli-Responsive Hydrogel with Reversible Three-State Transition Controlled by Redox Stimulation

    Yongqi Yang and Guanghui Gao

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/macp.201700002

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    In this paper, a reversible hydrogel with three-state transition is designed. The three transformations between original, oxidized, and reduced states are achieved by redox stimulation. Moreover, the hydrogel becomes injectable in reduced state and can be remolded under UV-light or NaClO immersion. These properties provide novel designing strategies and potential applications for smart and reusable materials.

  5. Effects of Cross-Link Density on Structures and Properties of Dual-Sensitive Semi-Interpenetrating Polymer Networks Hydrogel Microspheres

    Enping Lai, Yuxia Wang, Yi Wei, Guang Li and Guanghui Ma

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/macp.201600596

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    In this work, temperature and pH dual-responsive microspheres with N,N′-methylenebisacrylamide as cross-linker are prepared via premix membrane emulsification combined with one-step polymerization. With cross-linker amount increasing from 2.5 to 15%, the structures of microspheres change from loose structure to homogenous semi-interpenetrating network structure, and further convert to core–shell semi-interpenetrating network structure.