Macromolecular Chemistry and Physics

Cover image for Vol. 212 Issue 18

September 15, 2011

Volume 212, Issue 18

Pages 1947–2060

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    1. Macromol. Chem. Phys. 18/2011

      Hongsheng Luo, Jinlian Hu and Yong Zhu

      Article first published online: 8 SEP 2011 | DOI: 10.1002/macp.201190040

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      Cover:. Nanocomposites are endowed with heterogeneous twin switches by the incorporation of cellulose nanowhiskers into shape-memory polyurethane. The PCL soft segment serves as a thermally sensitive switch, while the percolation cellulose network serves as a water-sensitive switch. The composites exhibit triple-shape properties when triggered by thermal and water stimulus. Further details can be found in the article by H. Luo, J. Hu,* and Y. Zhu on page 1981.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    1. Macromol. Chem. Phys. 18/2011 (pages 1947–1950)

      Article first published online: 8 SEP 2011 | DOI: 10.1002/macp.201190039

  3. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    1. Poly(propylene)/Graphene Nanoplatelet Nanocomposites: Melt Rheological Behavior and Thermal, Electrical, and Electronic Properties (pages 1951–1959)

      Yunfeng Li, Jiahua Zhu, Suying Wei, Jongeun Ryu, Luyi Sun and Zhanhu Guo

      Article first published online: 22 JUL 2011 | DOI: 10.1002/macp.201100263

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      PP nanocomposites reinforced with graphene nanoplatelets are made using a PP/xylene solution strategy. The resulted nanocomposites show a threshold loading at 10.0–12.0wt% analyzed by electric conductivity. Improved thermal stability and crystallinity are observed in the nanocomposites. The GnP loading has a significant impact on the rheological behavior of the polymer nanocomposite melts.

    2. Fine Tuning of HOMO Energy Levels for Low-Band-Gap Photovoltaic Copolymers Containing Cyclopentadithienopyrrole and Bithiazole Units (pages 1960–1970)

      Dha1970njaya Patra, Duryodhan Sahu, Harihara Padhy, Dha2njay Kekuda, Chih-Wei Chu, Kung-Hwa Wei and Hong-Cheu Lin

      Article first published online: 28 JUL 2011 | DOI: 10.1002/macp.201100164

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      A series of photovoltaic polymers (P1–P5) containing an electron-donating dithienopyrrole unit and various electron-accepting bithiazole derivatives is synthesized. PSC devices are fabricated utilizing P1–P5 as electron donors and PCBM as an electron acceptor. P4 exhibits the highest power conversion efficiency of 0.69% with a solar-cell device structure of ITO/PEDOT:PSS/P4:PCBM (1:1w/w)/Ca/Al.

    3. Tailoring the Phase Behavior in Thermotropic Copolyesters (pages 1971–1980)

      Aránzazu Martínez-Gómez, Ernesto Pérez and Antonio Bello

      Article first published online: 1 JUL 2011 | DOI: 10.1002/macp.201100141

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      Thermotropic copolyesters from triethylene glycol 4,4′-bibenzoate and triethylene glycol 4,4′-naphthalate exhibit a tailored phase behavior, depending on composition, and easily accessible transition temperatures. The mesophases obtained are rather stable, without appreciable transformation into three-dimensional crystalline structures.

    4. Polymeric Shape Memory Nanocomposites with Heterogeneous Twin Switches (pages 1981–1986)

      Hongsheng Luo, Jinlian Hu and Yong Zhu

      Article first published online: 19 AUG 2011 | DOI: 10.1002/macp.201100292

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      Incorporation of cellulose nanowhiskers (CNW) into shape memory polyurethane (SMPU) endows the nanocomposites with heterogeneous twin switches. The PCL soft segment serves as the thermally sensitive switch whereas the percolation cellulose network (PCN) serves as the water sensitive switch. The composites exhibit interesting triple-shape properties when triggered by thermal and water stimulus, in the process of which the twin switches vary the states accordingly.

    5. SEC/DAD and 1H NMR Study of Molecular Weight and Configurational Stability of Poly(2,4-difluorophenylacetylene) and Polyphenylacetylene Prepared with Rh Catalyst (pages 1987–1998)

      Olga Trhlíková, Jiří Zedník, Jiří Vohlídal and Jan Sedláček

      Article first published online: 11 AUG 2011 | DOI: 10.1002/macp.201100228

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      Cis-to-trans isomerization of high-cis poly(2,4-difluorophenylacetylene) exposed to atmosphere in THF is found to accelerate simultaneous polymer degradation. In the partly aged polymer, microstructurally unperturbed high-cis macromolecules and isomerized macromolecules (exhibiting a strong red shift in visible spectrum) are non-uniformly distributed along the MW distribution as revealed by SEC/DAD.

    6. Cyclopolymerization of N,N-Dipropargyl-3,4-dialkoxyanilines Using Schrock and Grubbs-Hoveyda Initiators: Influence of Initiator Structure on the Mode of Insertion (pages 1999–2008)

      Michael R. Buchmeiser, Christian Schmidt and Dongren Wang

      Article first published online: 28 JUL 2011 | DOI: 10.1002/macp.201100211

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      The cyclopolymerzation of 4-aza-1,6-heptadiynes by a series of Schrock- and Grubbs-Hoveyda type initiators is described. The structure of the polymers' repeat units is elucidated with the aid of model compounds, revealing significant influence of the initiators' structure on the extent of α- and β-insertion, respectively. The mode of insertion is correlated with initiator structure.

    7. SAXS/DSC Analysis of the Lamellar Thickness Distribution on a SSA Thermally Fractionated Model Polyethylene (pages 2009–2016)

      Arnaldo T. Lorenzo, María L. Arnal, Alejandro J. Müller, Ming-Champ Lin and Hsin-Lung Chen

      Article first published online: 26 JUL 2011 | DOI: 10.1002/macp.201100240

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      SAXS/SSA data can be used to derive a lamellar thickness distribution by employing a modified Gibbs-Thompson equation. The average lamellar thicknesses l obtained from this procedure can help to validate l values obtained from DSC. The final DSC heating scan after SSA can then be converted to a lamellar thickness distribution.

    8. An Efficient In Situ Polymerization Method for the Production of Polyethylene/Clay Nanocomposites: Effect of Polymerization Conditions on Particle Morphology (pages 2017–2028)

      Abolfazl Maneshi, João B. P. Soares and Leonardo C. Simon

      Article first published online: 9 AUG 2011 | DOI: 10.1002/macp.201100189

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      Organoclay-supported Cp2ZrCl2with different zirconium loading is prepared and the effects of polymerization temperature, TIBA concentration, and catalyst loading on the polymerization activity, clay exfoliation, and powder morphology during in situ polymerization of ethylene are studied. Higher Zr loading results in higher polymerization activities, better clay exfoliation, and more sensitivity towards TIBA concentration and polymerization temperature.

    9. Complex Branched Polyolefin Generated from Quasi-living Polymerization of 4-Methyl-1-pentene Catalyzed by α-Diimine Palladium Catalyst (pages 2029–2035)

      Lihua Guo, Haiyang Gao, Lin Li and Qing Wu

      Article first published online: 22 JUL 2011 | DOI: 10.1002/macp.201100152

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      The microstructure of the polyolefin generated from 4-methyl-1-pentene catalyzed by α-diimine palladium catalyst can be controlled by varying the reaction temperature and monomer concentration. At 0°C, complex branched polyolefins are generated from the quasi-living polymerization of 4-methyl-1-pentene.

    10. Studies on Photoinduced ATRP in the Presence of Photoinitiator (pages 2036–2042)

      Mehmet Atilla Tasdelen, Mustafa Uygun and Yusuf Yagci

      Article first published online: 22 JUL 2011 | DOI: 10.1002/macp.201100267

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      Photoinduced reverse and simultaneous reverse and normal initiation (SR&NI) atom transfer radical polymerization (ATRP) of methyl methacrylate are investigated. Compared to the photoinduced reverse ATRP, SR&NI ATRP allows for better control over molecular weight with narrow molecular weight distributions.

    11. Semicontinuous Emulsion Polymerization of Butyl Methacrylate and 1, 3-Butadiene in the Presence of Cyclodextrins and Cytocompatibility of Dicarboxylic Acid Telechelic Oligo(butyl Methacrylate)s Derived from Ozonolysis of the Latexes (pages 2043–2051)

      Joyleen Poole, Sheila MacNeil and Stephen Rimmer

      Article first published online: 22 JUL 2011 | DOI: 10.1002/macp.201100212

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      Emulsion copolymerization of butyl methacrylate and 1,3-butadiene at atmospheric pressure is facilitated by inclusion of cyclodextrins in the reaction mixture. Ozonolysis yields telechelic oligomers with carboxylic acid end groups. It is shown that the oligomers are not toxic to fibroblasts when compared to a polylactide acid oligomer.

    12. Gelation Kinetics of Thermosensitive PNIPAM Microgel Dispersions (pages 2052–2060)

      Wang Liao, Yongjun Zhang, Ying Guan and X. X. Zhu

      Article first published online: 22 JUL 2011 | DOI: 10.1002/macp.201100137

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      Thermally gellable poly(N-isopropylacrylamide) (PNIPAM)-based hydrogels are highly desirable biomaterials, but their gelation kinetics have not been investigated. For the first time, the gelation kinetics of a new thermogelling system, PNIPAM microgel dispersion, is investigated using small-deformation oscillatory rheological measurements.

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