Macromolecular Chemistry and Physics

Cover image for Vol. 214 Issue 6

March 25, 2013

Volume 214, Issue 6

Pages 633–741

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      Macromol. Chem. Phys. 6/2013 (page 633)

      Siti Nurkhamidah and Eamor M. Woo

      Article first published online: 13 MAR 2013 | DOI: 10.1002/macp.201370020

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      Front Cover: By controlling the film thickness, non-birefringent and birefringent concentric ring-banded spherulites can be obtained in poly(L-lactic acid) (PLLA), melt-crystallized at 112 °C, for film thicknesses of 350 nm up to 2000 nm, respectively. The nanoscale morphology in these unconventional ring bands is influenced further by the different lamellar arrangements across the bands. Further details can be found in the article by S. Nurkhamidah and E. M. Woo* on page 673.

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    1. Macromol. Chem. Phys. 6/2013

      Article first published online: 13 MAR 2013 | DOI: 10.1002/macp.201370021

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    1. Macromol. Chem. Phys. 6/2013 (pages 635–638)

      Article first published online: 13 MAR 2013 | DOI: 10.1002/macp.201370022

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    1. Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions? (pages 639–653)

      Haixin Zhou and Shouke Yan

      Article first published online: 13 DEC 2012 | DOI: 10.1002/macp.201200530

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      Epitaxy based on crystallographic interaction can govern the crystal structure of overgrowing polymers. It therefore provides a simple and efficient way to fabricate ordered structures of homopolymers with controlled chain orientation, crystal modification, and spatial arrangement of the backbone chain. An expansion of this method to control structures of polymer blends is a trend and challenge in the field of polymer science.

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    1. A Bifunctional Diblock Copolymer from Consecutive RAFT Polymerizations and its Functionalization (pages 654–663)

      Xiaowu Jiang, Xiangyang Du, Lifen Zhang and Zhenping Cheng

      Article first published online: 1 FEB 2013 | DOI: 10.1002/macp.201200609

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      Well-defined bifunctional P(GMA)-b-P(VBC) copolymer with preserved epoxide and benzyl chloride (ATRP initiator) groups is synthesized via RAFT polymerization. Subsequent ATRP produces diblock copolymers with grafted polymer brushes. A ring-opening reaction of the epoxide groups of the P(GMA) block with functional amines produces a brush-type amphiphilic graft copolymer.

    2. Systematic Investigation of a Novel Low-Bandgap Terpolymer Library via Inkjet Printing: Influence of Ink Properties and Processing Conditions (pages 664–672)

      Anke Teichler, Jolke Perelaer, Florian Kretschmer, Martin D. Hager and Ulrich S. Schubert

      Article first published online: 17 JAN 2013 | DOI: 10.1002/macp.201200526

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      A thin-film library consisting of novel conjugated low-bandgap poly(diketopyrrolopyrrole-co-benzothiadiazole-co-fluorene) (poly(DPP-co-BTD-co-F)) polymers is investigated by combinatorial screening and inkjet printing. The polymer compositions and the choice of solvent are found to have a significant influence on the film properties.

    3. Unconventional Non-birefringent or Birefringent Concentric Ring-Banded Spherulites in Poly(L-lactic acid) Thin Films (pages 673–680)

      Siti Nurkhamidah and Eamor M. Woo

      Article first published online: 7 JAN 2013 | DOI: 10.1002/macp.201200673

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      The film thickness and different lamellar arrangements are proven to induce the formation of non-birefringent or birefringent concentric ring-banded spherulites in thin poly(L-lactic acid) (PLLA) spin-cast films (about 350–400 nm or 1800–2000 nm).

    4. Semi-Random Two-Acceptor Polymers: Elucidating Electronic Trends Through Multiple Acceptor Combinations (pages 681–690)

      Beate Burkhart, Petr P. Khlyabich and Barry C. Thompson

      Article first published online: 27 DEC 2012 | DOI: 10.1002/macp.201200618

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      A family of four novel semi-random two-acceptor copolymers is reported. Both the absorption profile and the bandgap of novel two-acceptor polymers can be predicted through a linear combination of the respective one-acceptor polymers, and the highest occupied molecular orbital (HOMO) level energies are linearly correlated to the Voc measured in the corresponding bulk-heterojunction (BHJ) solar cells.

    5. Encapsulation of In Situ Nanoprecipitated Inorganic Materials in Confined Geometries Into a Polymer Shell Using Inverse Miniemulsion (pages 691–699)

      Anika Hamberger, Ulrich Ziener and Katharina Landfester

      Article first published online: 30 JAN 2013 | DOI: 10.1002/macp.201200471

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      The extraordinary kinetic stability of miniemulsions opens the way to a general and simple synthetic route for the incorporation of highly insoluble inorganic nanoparticles like BaSO4 into polymeric capsules. The nanoparticles are generated by mixing two inverse miniemulsions and precipitation from their disperse phases consisting of aqueous precursor solutions.

    6. Emulsion Self-Assembly Synthesis of Chitosan/Poly(lactic-co-glycolic acid) Stimuli-Responsive Amphiphiles (pages 700–706)

      Xufeng Niu, Lizhen Wang, Pin Chen, Xiaoming Li, Gang Zhou, Qingling Feng and Yubo Fan

      Article first published online: 18 JAN 2013 | DOI: 10.1002/macp.201200597

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      Chitosan can be dissolved into deionized water together with 1-hydroxybenzotriazole. A water-in-oil (W/O) chitosan and poly(lactic-co-glycolic acid) microemulsion is prepared and then a chitosan-graft-poly(lactic-co-glycolic acid) stimuli-responsive amphiphile is fabricated. The obtained amphiphile can self-assemble to form micelle in suitable solvents.

    7. Bismuth(III) Alkoxide Catalysts for Ring-Opening Polymerization of Lactides and ϵ-Caprolactone (pages 707–715)

      Sirpa Vuorinen, Mohammed Lahcini, Timo Hatanpää, Markku Sundberg, Markku Leskelä and Timo Repo

      Article first published online: 24 JAN 2013 | DOI: 10.1002/macp.201200521

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      A series of homoleptic bismuth(III) alkoxides is studied for the ring-opening polymerization (ROP) of lactides and ϵ-caprolactone. The complexes bearing bulky alkoxide ligands (–OtBu or –OCMe2iPr) acted as active lactide ROP catalysts. In bulk polymerizations of ϵ-caprolactone by Bi(OtBu)3, polymers of predictable molecular weight (Mns up to 120 000 g mol−1) are obtained.

    8. Synthesis of Photoresponsive Spiropyran-Based Hybrid Polymers and Controllable Light-Triggered Self-Assembly Study in Toluene (pages 716–725)

      Li Ma, Jinze Li, Dan Han, Haiping Geng, Guangxin Chen and Qifang Li

      Article first published online: 31 JAN 2013 | DOI: 10.1002/macp.201200590

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      A photoresponsive poly(spiropyran-containing methacrylate) modified with polyhedral oligomeric silsesquioxane (POSS) is synthesized by atom transfer radical polymerization (ATRP). Its self-assembly behavior is studied in toluene. Under the control of UV and visible light, it can reversibly self-assemble into aggregates because the closed spiropyrans transform to charged merocyanines, which form stacks that act as non-covalent crosslinking points and the POSS shell guarantees the stability of the aggregates.

    9. Copolyesters of Lactide, Isosorbide, and Terephthalic Acid-Biobased, Biodegradable, High-Tg Engineering Plastics (pages 726–733)

      Hans R. Kricheldorf and Steffen M. Weidner

      Article first published online: 4 FEB 2013 | DOI: 10.1002/macp.201200612

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      Copolyesters of lactide, isosorbide, and terephthalic acid are prepared by a combination of ring-opening polymerization and polycondensation. Number-average molecular weights around 20 kDa and polydispersities above 3 are found together with a high content of cyclics. The glass transitions vary with the lactide content between 89 and 180 °C.

    10. Liquid-Crystalline Nano-optomechanical Actuator (pages 734–741)

      Stanislav Tsoi, Jing Zhou, Christopher Spillmann, Jawad Naciri, Tomiki Ikeda and Banahalli Ratna

      Article first published online: 17 JAN 2013 | DOI: 10.1002/macp.201200581

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      The synthesis and characterization of an opto-responsive nanoparticle capable of reversible shape change is described. Co-ordinated photoisomerization of azobenzene molecules imparts a conformational change to the polymer network of the nanoparticle and results in a measurable and reproducible shape change.

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