Journal of Polymer Science Part A: Polymer Chemistry
Copyright © 2012 Wiley Periodicals, Inc., A Wiley Company
Impact Factor: 3.543
ISI Journal Citation Reports © Ranking: 2012: 12/83 (Polymer Science)
Online ISSN: 1099-0518
Associated Title(s): Journal of Polymer Science Part B: Polymer Physics
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- Tailoring heterogeneous polymer networks through polymerization-induced phase separation: influence of composition and processing conditions on reaction kinetics and optical properties
Carmem S. Pfeifer, Zachary R. Shelton, Caroline R. Szczpanski, Matthew D. Barros, Nicholas D. Wilson and Jeffrey W. Stansbury
Article first published online: 17 APR 2014 | DOI: 10.1002/pola.27185
The crossover between loss and storage modulus during polymerization is assumed to be a good approximation of the onset of gelation. The abrupt decrease in the intensity of light transmitted through a mixture of marginally compatible monomers during polymerization is used to determine the onset of phase-separation. Because both these parameters (modulus development and optical transmission) were indexed to the degree of conversion in real-time, it is possible to demonstrate that heterogeneity formation precedes gelation in an all-methacrylate system, photopolymerized with a single radical initiator.
- One-step synthesis of polymer micro-tubes tethered by polymer nanowire networks via RAFT polymerization of N,N′-methylene bisacrylamide xerogel fibers in toluene and ethanol mixed solution
Qi Li and Liming Tang
Article first published online: 17 APR 2014 | DOI: 10.1002/pola.27194
The new preparation method of polymer micro-tubes tethered by polymer nanowire networks (PTPWNs) is presented. PTPWNs are fabricated facilely via one-step reversible addition fragmentation chain transfer (RAFT) polymerization of N,N′-methylene bisacrylamide (MBA) xerogel fibers as both template and monomer source in toluene and ethanol mixed solution. The amount of polymer nanowire networks on the tubes can be controlled by varying the ethanol content in solution.
- Selective nucleophilic additions to poly(methacrylate)s containing isothiocyanate moieties in the side chains and their application in cross-linking
Ryota Seto, Kozo Matsumoto and Takeshi Endo
Article first published online: 15 APR 2014 | DOI: 10.1002/pola.27189
Reactivity of isothicyanate moiety containing polymethacrylate in the side chain with amine, alcohol, or thiol was investigated. The isothiocyanate moiety containing polymethacrylates in the side chain reacted with amines without a catalyst. Conversely, the isothiocyanates did not react with alcohol or thiols under the same condition applied to the amines. Addition of alcohol or thiol to the isothiocyanate needs catalysts. A diamine or diol was added to the isothicyanates to prepare networked polymers.
- You have free access to this contentSynthesis and solid-state self-assembly of poly(ethylene glycol)-b-poly(γ-benzyl-l-glutamate)s and single-walled carbon nanotubes
Haoyu Tang, Ying Ling, Yong Deng and Donghui Zhang
Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27193
A series of coil-rod poly(ethylene glycol)-b-poly(γ-benzyl-l-glutamate)s (PEG-b-PBLGs) with α-helical conformations have been prepared from methoxypoly(ethylene glycol) amine (mPEG-NH2)-mediated ring-opening polymerization of γ-benzyl-l-glutamic acid based N-carboxylanhydride. PEG-b-PBLGs form a lamellar structure where PBLG segments pack into hexagonal arrays when frod is less than 0.28. Incorporation of single-walled carbon nanotube (SWCNT) causes an increase of the d-spacing of both lamellar and hexagonal packing, suggesting the intercalation of SWCNTs into the PEG-b-PBLGs matrices the SWCNTs are oriented normal to the lamellar interface.
- Synthesis and properties of long-chain branched poly(ether sulfone)s by self-polycondensation of AB2 type macromonomers
Mitsutoshi Jikei, Daisuke Uchida, Kazuya Matsumoto, Ryohei Komuro and Masataka Sugimoto
Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27188
Long-chain branched poly(ether sulfone)s (PESs) are synthesized via self-polycondensation of AB2 macromonomers. Gel permeation chromatography with multiangle light scattering detection and solution viscosity measurements suggest that the molecular shape of long-chain branched PESs changes from hyperbranched to a linear-like architecture, depending on the molecular weight of the AB2 macromonomers. Rheological measurements suggest the presence of strongly entangled chains in the long-chain branched PES synthesized from the high-molecular-weight macromonomer.