Macromolecular Chemistry and Physics
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Materials Science Weekly Newsletter
Recently Published Articles
- Blending with Non-responsive Polymers to Incorporate Nanoparticles into Shape-Memory Materials and Enable Photothermal Heating: The Effects of Heterogeneous Temperature Distribution
David B. Abbott, Somsubhra Maity, Mary T. Burkey, Russell E. Gorga, Jason R. Bochinski and Laura I. Clarke
Article first published online: 29 SEP 2014 | DOI: 10.1002/macp.201400386
Blending shape-memory materials with a compatible carrier polymer containing metal nanoparticles enables wavelength-specific light-to-heat triggering. Particles utilized as nanoscale heaters are contained within the carrier polymer, which will act as either “soft”, “hard”, or inert phases with respect to the actuation, having differing advantages and challenges in each case.
- Near-Infrared-Irradiation-Induced Remote Activation of Surface Shape-Memory to Direct Cell Orientations
Qinghui Shou, Koichiro Uto, Wei-Chih Lin, Takao Aoyagi and Mitsuhiro Ebara
Article first published online: 29 SEP 2014 | DOI: 10.1002/macp.201400353
Near-infrared (NIR)-irradiation-induced remote control of cell alignment is demonstrated using shape-memory nanopatterned surfaces. The NIR-responsive shape-memory nanopatterns are prepared by chemically crosslinking poly(ε-caprolactone) in the presence of gold nanorods. Upon NIR irradiation, cells start to change their morphology as the temporal nanopatterns transition to a flat surface.
- Radical Propagation Kinetics of N-Vinylpyrrolidone in Organic Solvents Studied by Pulsed-Laser Polymerization–Size-Exclusion Chromatography (PLP–SEC)
Lucia Uhelská, Dušan Chorvát, Robin A. Hutchinson, Sandhya Santanakrishnan, Michael Buback and Igor Lacík
Article first published online: 29 SEP 2014 | DOI: 10.1002/macp.201400329
The propagation rate coefficient, kp, for N-vinylpyrrolidone is determined by pulsed-laser polymerization with subsequent analysis of the polymer molar mass distribution by size-exclusion chromatography in a series of organic solvents differing in types of intermolecular interactions, and compared with polymerization in water. The hydrogen-bonding interactions are primarily responsible for the dependence of the kp value on monomer concentration.
- Association of Nucleobase-Containing Ammonium Ionenes
Mana Tamami, Keren Zhang, Ninad Dixit, Robert B. Moore and Timothy E. Long
Article first published online: 29 SEP 2014 | DOI: 10.1002/macp.201400277
The spacer length between an ionene backbone and pendant nucleobases influences hydrogen-bonding associations between chains having complementary or non-complementary nucleobase units. The glass-transition temperatures of ionene–adenine and ionene–thymine blends with a 4-bond spacer adhere to Fox–Flory predictions, indicating the absence of inter/intramolecular hydrogen bonding associations, whereas 9-bond-spacer ionene blends show a significant negative deviation. This deviation is attributed to hydrogenbonding interactions and is based on the Kwei model, illustrating that the heteroassociation between complementary chains is weaker than homoassociation.
- Synthesis, Properties, and Applications of Ion-Containing Polyurethane Segmented Copolymers
Ashley M. Nelson and Timothy E. Long
Article first published online: 29 SEP 2014 | DOI: 10.1002/macp.201400373
The synthesis, structure–property relationships, and emerging applications of ion-containing polyurethane segmented copolymers are discussed, focusing on recent literature. Highlighting a variety of novel anionic, cationic, and zwitterionic monomers, polyurethanes with ionic sites end-capping in the hard segment and/or in the soft segment are examined, revealing a broad range of tunable material properties.