Macromolecular Chemistry and Physics

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Best of Macros 2017 is now online. Click here to read about the selected articles and their authors.

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  1. Properties and Phase Structure of Polycaprolactone-Based Segmented Polyurethanes with Varying Hard and Soft Segments: Effects of Processing Conditions

    Balazs Imre, Hubert Gojzewski, Casey Check, Richard Chartoff and G. Julius Vancso

    Version of Record online: 16 NOV 2017 | DOI: 10.1002/macp.201700214

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    A series of polycaprolactone segmented polyurethanes (PUs) polymerized both in solution and bulk from blocked isocyanate prepolymers is the focus of this study. The effects of varying the chemical structure and processing of the PUs on their phase structure are evaluated. Differences in properties due to processing are related to morphology which includes rod-like nanocrystallites.

  2. Fabrication of Polymer Structure among Fibrous Structure of Poly(lactic acid) Gel and Improvement of Physical Properties

    Yasuhiro Matsuda, Hiroki Ashizawa, Takahiro Fukui, Ryo Akao and Shigeru Tasaka

    Version of Record online: 16 NOV 2017 | DOI: 10.1002/macp.201700317

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    Polymer structure of a block copolymer of poly(l-lactic acid) (PLLA) and polystyrene is formed among a fibrous structure of PLLA inducing the gelation of PLLA in N,N-dimethylformamide. The spherical structure of the block copolymer is formed on the fibrous structure of PLLA, and elevates the flow temperature of the gel.

  3. Energy Consumption for the Desalination of Salt Water Using Polyelectrolyte Hydrogels as the Separation Agent

    Lukas Arens, Julius B. Albrecht, Johannes Höpfner, Karin Schlag, Axel Habicht, Sebastian Seiffert and Manfred Wilhelm

    Version of Record online: 15 NOV 2017 | DOI: 10.1002/macp.201700237

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    Salt water is desalinated via poly(acrylic acid)-based hydrogels in a membrane-free forward osmosis process where the polyelectrolyte acts as both, the draw and the separation agent simultaneously. The energy consumption for this new process is calculated for the first time. Chemical parameters of the network structure and potential process parameters are varied to improve energy efficiency.

  4. Unexpected Large Depression of VPTT of a PNIPAM Microgel by Low Concentration of PVA

    Zhuo Tang, Junying Weng, Ying Guan and Yongjun Zhang

    Version of Record online: 15 NOV 2017 | DOI: 10.1002/macp.201700364

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    A low concentration of poly(vinyl alcohol) (PVA) can dramatically reduce the volume phase transition temperature of the surface layer of poly(N-isopropylacrylamide-co-2-acrylamido-phenylboronic acid) (P(NIPAM-2-AAPBA)) microgel. The adsorption of PVA chains onto the P(NIPAM-2-AAPBA) microgel spheres shortens the distance between the PVA and PNIPAM chains, allowing they influence the thermal behavior of PNIPAM more effectively and hence dramatically reducing the phase transition temperature of the latter.

  5. Control of Radiation/Living Graft Polymerization in the Solid State

    Takashi Hamada, Shin Hasegawa and Yasunari Maekawa

    Version of Record online: 15 NOV 2017 | DOI: 10.1002/macp.201700346

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    Well-defined graft polymers are synthesized by a combination of radiation-induced graft polymerization and atom transfer radical polymerization (ATRP) in the solid-state poly(ether ether ketone). The living nature of the propagating radicals at the terminal of grafted polymers is confirmed by successive ATRP.