Macromolecular Chemistry and Physics

Cover image for Vol. 218 Issue 4

February 2017

Volume 218, Issue 4

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      Macromol. Chem. Phys. 4/2017

      Zsófia Osváth and Béla Iván

      Version of Record online: 16 FEB 2017 | DOI: 10.1002/macp.201770012

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      Front Cover: The critical solution temperature (CST) of solutions for LCST- and UCST-type thermoresponsive polymers is crucial not only from scientific but application point of views as well. However, single-point experimental data are widely claimed inappropriately as LCST or UCST without measuring the full phase diagram. Comparison of the broadly scattering data is impossible because of the lack of standardized CST determination for the heating-cooling cycles. An attempt to overcome these frustrating difficulties by determining the cloud point (TCP), clearing point (TCL), width of hysteresis (XH) and extent of transmittance recovery (YH) as a function of condition parameters is reported by Zsófia Osváth and Béla Iván in the article number 1600470.

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    1. Masthead: Macromol. Chem. Phys. 4/2017

      Version of Record online: 16 FEB 2017 | DOI: 10.1002/macp.201770013

  3. Contents

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      Contents: Macromol. Chem. Phys. 4/2017

      Version of Record online: 16 FEB 2017 | DOI: 10.1002/macp.201770014

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    1. The Dependence of the Cloud Point, Clearing Point, and Hysteresis of Poly(N-isopropylacrylamide) on Experimental Conditions: The Need for Standardization of Thermoresponsive Transition Determinations

      Zsófia Osváth and Béla Iván

      Version of Record online: 18 NOV 2016 | DOI: 10.1002/macp.201600470

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      The noncomparable different conditions used for critical solution temperature (CST) determination for lower CST(LCST)- and upper CST(UCST)-type polymers and the hardly investigated hysteresis with the example of poly(N-isopropylacrylamide) are investigated. Fundamental relations and standardized cloud point (TCP), clearing point (TCL), width of hysteresis (XH), and extent of transmittance recovery (YH) determination are reported.

    2. Synthesis and Characterization of Epoxy Thermosetting Polymers from Glycidylated Organosolv Lignin and Bisphenol A

      Lena Charlotte Over, Etienne Grau, Stéphane Grelier, Michael A. R. Meier and Henri Cramail

      Version of Record online: 14 DEC 2016 | DOI: 10.1002/macp.201600411

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      Epoxy thermosetting polymers from glycidylated organosolv lignin, diglycidyl ether of bisphenol A, and isophorone diamine are discussed for lignin contents between 0 and 42 wt%. Lignin-based thermosets show higher crosslinking densities that lead to higher glass transition, lower swelling percentages, and increased stiffness if compared to nonlignin polyepoxides.

    3. Efficient and Robust Reactions for Polyethylene Covalently Grafted Carbon Nanotubes

      Yongjie Zhang, Qian Li, Wenbo Wang, Anru Guo, Jie Li and Huayi Li

      Version of Record online: 22 DEC 2016 | DOI: 10.1002/macp.201600449

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      Short polyethylene (PE) chains are covalently conjugated onto multiwall carbon nanotube (MWNT) via efficient and robust reactions. End-grafted PE chains provide high compatibility between MWNT and PE matrix and thus promote homogeneous dispersion of MWNT into PE matrix.

    4. Design and Fabrication of Janus Nanoparticles for Interfacial Distribution in Block Copolymers

      Qiuyan Yang and Katja Loos

      Version of Record online: 22 DEC 2016 | DOI: 10.1002/macp.201600451

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      The location of synthesized Janus nanoparticles (JNPs) in PS-b-P2VP block copolymers thin films and bulk are investigated in detail. The dispersed JNPs are observed to be located at the boundary of the two morphological phases in PS-b-P2VP despite aggregation problems.

    5. Determination of the Wall Thickness of Block Copolymer Vesicles by Fluorescence Lifetime Imaging Microscopy

      Stephan Handschuh-Wang, Daniel Wesner, Tao Wang, Pengyu Lu, Katrin-Stephanie Tücking, Simon Haas, Sergey I. Druzhinin, Xin Jiang and Holger Schönherr

      Version of Record online: 20 DEC 2016 | DOI: 10.1002/macp.201600454

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      Fluorescence lifetime imaging microscopy reveals the drying kinetics of polymeric vesicles. The analysis of the excited state lifetimes of the reporter dye calcein in the different nanoenvironments of polymersomes affords time-resolved information about the water content of nanocapsules and from the vesicle size dependence an estimate for the wall thickness.

    6. Peanut-Like Crystals in Polycarbonate/Plasticizer Blends

      Yanyan Liang, Xingping Zhou, Jun Wu, Yonggui Liao, Jintao Zhu, Xiaolin Xie and Huamin Zhou

      Version of Record online: 8 DEC 2016 | DOI: 10.1002/macp.201600471

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      Peanut-like bisphenol-A polycarbonate (BAPC) crystals in BAPC/plasticizer blends are formed during solution casting with dichlomethane as solvent. The formation of peanut-like crystals is mainly ascribed to the local orientations of BAPC chains, which are induced by the concentration fluctuation during solvent evaporation and further fixed by the quick drying process.

    7. Highly Efficient Chain End Derivatization of Selenol-Ended Polystyrenes by Nucleophilic Substitution Reactions

      Weihong Lu, Xiaowei An, Feng Gao, Jian Zhu, Nianchen Zhou, Zhengbiao Zhang, Xiangqiang Pan and Xiulin Zhu

      Version of Record online: 23 NOV 2016 | DOI: 10.1002/macp.201600485

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      Selenol-X chemistries, including nucleophilic substitution and Se-Michael addition reactions, are investigated and applied for end-modification of polystyrene.

    8. Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

      Alina Amirova, Serafim Rodchenko, Zhanna Makhmudova, Georgij Cherkaev, Sergey Milenin, Elena Tatarinova, Mikhail Kurlykin, Andrey Tenkovtsev and Alexander Filippov

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/macp.201600387

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      Thermosensitive poly(2-isopropyl-2-oxazoline) stars with carbosilane dendrimer core are synthesized. The initiation of half of functional groups is observed. Different types of aggregates are formed in aqueous solutions at room temperature due to hydrophobic carbosilane core. The macromolecule compactization and aggregation occur on heating.

    9. Sucrose Methacrylate-Based Amphiphilic Block Copolymers

      Paula de Almeida, Lívia Mesquita Dias Loiola, Cesar Liberato Petzhold and Maria Isabel Felisberti

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/macp.201600452

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      Poly(sucrose methacrylate)-block-poly(alkyl methacrylate), with ethyl, butyl and hexyl as alkyl group, synthesized by atom tranfer raft polymerization (ATRP) present solubility, thermal properties and morphology quite different from poly(alkyl methacrylate) homopolymer, even having low sucrose methacrylate contents. The heterogeneous copolymers are able to self-assemble in solution and in bulk.

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