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Multiple Stimuli-Responsive and White-Light Emission of One-Pot Synthesized Block Copolymers Containing Poly(3-hexylthiophene) and Poly(triethyl glycol allene) Segments

24-Jul-2015 | Yan-Yu Hu; Ming Su; Cui-Hong Ma; Zhipeng Yu; Na Liu; Jun Yin; Yunsheng Ding; Zong-Quan Wu, Macromolecules, 2015

Conjugated block copolymers with tunable properties have attract considerable research interests in recent years. Herein, we report a series of novel block copolymers containing conjugated poly(3-hexylthiophene) (P3HT) and poly(triethyl glycol allene) (PTA) segments which were synthesized in one ...

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Friction of Zwitterionic Hydrogel by Dynamic Polymer Adsorption

23-Jul-2015 | Jamil Ahmed; Tetsurou Yamamoto; Honglei Guo; Takayuki Kurokawa; Takayuki Nonoyama; Tasuku Nakajima; Jian Ping Gong, Macromolecules, 2015

A simplified model describing the sliding friction of hydrogel on solid surface by dynamic adsorption of the polymer chains is proposed on the basis of polymer adsorption–repulsion theory. This dynamic adsorption model is used to analyze the friction results of zwitterionic hydrogels sliding over ...

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All Poly(ionic liquid)-Based Block Copolymers by Sequential Controlled Radical Copolymerization of Vinylimidazolium Monomers

22-Jul-2015 | Daniela Cordella; Anthony Kermagoret; Antoine Debuigne; Christine Jérôme; David Mecerreyes; Mehmet Isik; Daniel Tato ..., Macromolecules, 2015

The organometallic-mediated radical polymerization (OMRP) of N-vinyl-3-alkylimidazolium-type monomers, featuring the bis(trifluoromethylsulfonyl)imide counteranion (Tf2N–), in the presence of Co(acac)2 as controlling agent, is reported. Polymerizations of monomers with methyl, ethyl, and butyl ...

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Dual-Stimuli-Responsive l-Serine-Based Zwitterionic UCST-Type Polymer with Tunable Thermosensitivity

20-Jul-2015 | Tanmoy Maji; Sanjib Banerjee; Yajnaseni Biswas; Tarun K. Mandal, Macromolecules, 2015

The synthesis of l-serine-based zwitterionic polymers, poly(l-serinyl acrylate)s (PSAs), of controllable molecular weights and low polydispersities via reversible addition–fragmentation chain transfer (RAFT) polymerization in water at 70 °C is described. The obtained homopolymer PSA exhibits dual ...

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Tuning the Solid State Emission of Thin Films/Microspheres Obtained from Alternating Oligo(3-octylthiophenes) and 2,6-Bis(pyrazole)pyridine Copolymers by Varying Conjugation Length and Eu3+/Tb3+ Metal Coordination

07-Jul-2015 | Yemineni S. L. V. Narayana; Martin Baumgarten; Klaus Müllen; Rajadurai Chandrasekar, Macromolecules, 2015

A series of dialkynyl-functionalized oligo(3-octylthiophene)m (m = 1–7 and 9, where m is the number of thiophene units) were polymerized together with 2,6-bis(pyrazole)pyridine (BPP) to get alternating copolymers (P1–P7 and P9) with the number-average molecular weights (Mn) in the range of 5.3–11 ...

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Multimodal Stimuli-Responsive Poly(2-isopropyl-2-oxazoline) with Dual Molecular Logic Gate Operations

07-Jul-2015 | Joo-Ho Kim; Eunhye Koo; Sang-Yong Ju; Woo-Dong Jang, Macromolecules, 2015

Azobenzene end-functionalized telechelic POx (Az-POx-Az) was designed for as multimodal stimuli-responsive polymer. Az-POx-Az (0.25 g/L) in physiological saline (150 mM NaCl) phosphate buffered solution (10 mM PBS, pH 7.4) exhibited fully reversible trans–cis photoisomerism upon alternate ...

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UV-Irradiation-Enhanced Photoluminescence Emission of Polyfluorenes Containing Heterocyclic Benzo[c]cinnoline Moieties

01-Jul-2015 | Hsin-Chung Wu; Jyh-Chien Chen; Hong-Ze Lin, Macromolecules, 2015

Polyfluorenes (PFO) derivatives, containing different ratios of heterocyclic, electron-withdrawing benzo[c]cinnoline moieties, BF10, BF25, and BF50 were synthesized by Suzuki coupling reaction. Photoluminescence (PL) spectra showed red-shifted emission peaks at around 500 nm for dilute polymer ...

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Quantifying the Level of Intermacromolecular Interactions in Ethylene–Propylene Copolymers by Using Pyrene Excimer Formation

01-Jul-2015 | Solmaz Pirouz; Jean Duhamel; Sheng Jiang; Akhilesh Duggal, Macromolecules, 2015

A unique methodology based on fluorescence measurements is introduced to quantitatively measure the actual level of interpolymeric association between ethylene–propylene (EP) copolymers used as viscosity index improvers (VIIs) in engine oils. To this end, two EP copolymers, one amorphous (EP(AM)) ...

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Surface-Initiated Chain Growth Polyaramid Brushes

26-Jun-2015 | Frederick C. Prehn, Jr.; Stephen G. Boyes, Macromolecules, 2015

Synthesis of well-defined, surface-initiated poly(N-octyl-p-benzamide) brushes was demonstrated using a new “grafting from” chain growth technique. A solution-based chain growth polycondensation technique was adopted from literature and modified to form a polyaramid brush by taking advantage of ...

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Dynamic Molecular Behavior on Thermoresponsive Polymer Brushes

25-Jun-2015 | Huai-Ying Chin; Dapeng Wang; Daniel K. Schwartz, Macromolecules, 2015

The surface dynamics of individual surfactant and polymer molecules on thermally responsive polymer brushes (poly(N-isopropylacrylamide), PNIPAAM) were studied using high throughput single molecule tracking microscopy. The probe molecules universally exhibited intermittent hopping motion, in ...

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