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In this study we synthesized medium-band gap, two-dimensional (2-D) conjugated polymers comprising electron-rich benzo[1,2-b:4,5-b′]dithiophene (BDT) units presenting conjugated thiophene (T) side chains and electron-deficient alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties. We introduced various solubilizing substituents—linear alkyl, alkoxy, and alkythio units—on the thiophene side chains to...
In this study we used Suzuki cross-coupling to synthesize three new donor/acceptor copolymers—PFTBO, PAFTBO, and PCTBO—featuring soluble alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties as acceptor units and electron-rich building blocks—dialkyl fluorene (F), alkylidene fluorene (AF), and carbazole (C), respectively—as donor units. These polymers, which we characterized using gel permeation chromatography,...
The well-known coil-to-globule transition of poly(N-isopropyl acrylamide) (PNIPAM) at its LCST lasts as short as hundred of seconds with fully reversibility. However, for the PNIPAM-containing block copolymers, thermal transformation from micelles to vesicles caused by the conformation transition of PNIPAM took as long as several weeks, even at the temperatures much higher than the LCST, and without...
A new unsymmetrical and concoplanar aromatic diamine monomer containing trifluoromethyl and dimethyl groups, 3,5-dimethyl-4-(4-amino-2-trifluoromethylphenoxy)-4′-aminobenzophenone (3), was synthesized in a three-step reaction using 2,6-dimethylphenol and 4-nitrobenzoyl chloride as starting materials. A series of fluorinated poly(ether ketone imide)s (PEKIs) (5a–d) were prepared from diamine 3 with...
A series of branched poly(ethylene terephthalate) (BPET) samples were prepared from melt polycondensation by incorporation of various amount (0.4–1.2mol%) of glycerol as a branching agent. These polymers were characterized by means of H 1 NMR, intrinsic viscosity. The general crystalline and melting behavior was investigated via DSC. It was found that the crystalline temperature T cc ...
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to quantitatively correlate to the surface chemical composition determined from XPS in poly(styrene-co-4-vinyl phenol) (STVPh)/poly(styrene-co-4-vinyl pyridine) (STVPy) blends or complexes when the hydroxyl contents in STVPh copolymers were gradually increased. It was found that different mixing thermodynamics such as immiscibility,...
A novel polymer (SDP) was first synthesized from 2,2'-diamino-4, 4'-bithiazole (DABT) with salicylic acid and paraformaldehyde (PF). SDP-Fe 2+ was prepared from SDP and FeSO 4 in DMSO. SDP-Prussian blue was prepared from SDP-Fe 2+ and potassium ferricyanide (K 3 [Fe(CN) 6 ]) in DMSO. They were characterized through IR, 1 H NMR, XPS and ESR...
The ionic interaction complexation between metal carboxylated polystyrene ionomers and poly(butyl methacrylate-co-vinyl pyridine) (BVP) in both solution and bulk was studied by viscometry, laser light scattering (LLS) and differential scanning calorimetry (DSC) and compared with that between BVP and carboxylated polystyrene (CPS), in which the interacting groups are in acid form. The results show...
The complexation between poly(4-vinyl pyridine) (PVPy) and mono-carboxy terminated polystyrene (MCPS) in chloroform leads to the formation of a graft-like supramolecular architecture. LLS and fluorescence spectroscopy have been used to monitor the self-assembly process of the “graft” copolymers in a selective mixed solvent of chloroform/toluene which is a solvent for MCPS but a nonsolvent for PVPy...
Soluble graft-like complexes were obtained via hydrogen bonding interaction between poly(4-vinyl pyridine) (PVPy) or poly(butyl acrylate-co-4-vinyl pyridine) (BVPy) and mono-carboxy terminated polystyrene (MCPS). The hydrogen-bonding interaction was evidenced by 13 C NMR and FT-IR. In the blend solution, the grafting of MCPS onto PVPy or BVPy backbones led to graft-like complexes showing...
Preparation and characterization of isolated particles and clusters of carboxylic acid-terminated polystyrene (CPS) and poly(4-vinyl pyridine) (P4VP) blends in chloroform/methanol (9/1, v/v) solution are reported. In chloroform CPS–P4VP blends form graft-like structure due to the interaction between terminal carboxylic acid and 4VP units. Upon addition of methanol, isolated particles and clusters...
Mono-carboxy terminated polystyrene oligomer (MCPS) and di-carboxy terminated polystyrene oligomer (DCPS) were prepared by anionic polymerization. Viscometry and dynamic light scattering (DLS) studies show that both MCPS and DCPS can interact with poly(4-vinyl pyridine) (PVPy) via hydrogen bonding to form soluble graft-like complexes in CHCl3. The marked differences in the viscosity–composition behaviour,...
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