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To elucidate temperature change of intermolecular interactions and chain dimensions for poly(dialkylsilane)s with or without thermochromism, synchrotron-radiation small-angle X-ray scattering and UV-absorption measurements were carried out for relatively low-molar mass poly(n-hexylmethyl)silane (PSi-1), poly(n-decylmethyl)silane (PSi-2), and poly(n-hexylpropyl)silane (PSi-3) samples in isooctane over...
This article describes the preparation and characterization of mixed mesoglobules from two thermoresponsive polymers: poly(N-isopropyl acrylamide) (PNIPAM) and poly(2-isopropyl-2-oxazoline) (PIPOX) and their coating with a crosslinked shell to obtain hybrid nanoparticles. The variations in dimensions and stability of the mixed mesoglobules prepared with different compositions (20/80, 50/50 and 80/20...
In order to have a fundamental understanding of the temporal evolution of physical characteristics of Polyetherimide (PEI) film and processing parameters, real time measurements are essential. Because drying and stretching processes of solvent-cast polymer film are complex, off line measurements are unable to reveal the temporally varying detailed information, especially for fast “transient events”...
Two donor–acceptor copolymers, PTVTBT and PTVTBO, using the highly π-extended (E)-2-(2-(thiophen-2-yl)vinyl)thiophen as an electron-rich unit and benzodiathiazole or benzoxadiazole as an electron-deficient one, were designed and synthesized via a Pd-catalyzed Stille-coupling method. The copolymers possess high thermal stability, broad absorption, low band gap, and good film-forming ability. Meanwhile...
Polymeric nanoparticles (PNPs) are emerging as promising carriers for controlled drug delivery. Poly(D,L-lactic-co-glycolic acid) (PLGA) is the most frequently used biodegradable and biocompatible polymer in the design nanoparticles for biomedical applications. Herein, we present PNPs prepared from the chemical modification of PLGA with sucrose and a cholic acid moieties (abbreviated as Suc-PLGA-Chol)...
Block copolymers of 2,2,6,6-tetramethyl-4-piperidyl methacrylate and glycidyl methacrylate were prepared by atom transfer radical polymerization. The block copolymer was immobilized on an indium-doped tin oxide substrate by simply coating the copolymer solution and annealing. The copolymer layers were efficiently converted to those of the corresponding 2,2,6,6-tetramethylpiperidin-1-oxy (TEMPO) polymer...
Li-ion battery technology is considered as the most efficient solution for the electrochemical energy storage. While standard liquid electrolyte – based configurations provide best performances, solid state electrolytes are developed as a safer alternative. Herein, we discuss a three step synthesis procedure of self-doped solid block copolymer electrolyte, combining a single-ion poly(lithium methacrylate-co-oligoethylene...
A series of thiol-ene UV-curable inorganic–organic hybrid polysilsesquioxanes of various phenyl:methacryloxypropyl and phenyl:mercaptopropyl copolymer compositions were synthesized in one-batch using a base-catalyzed system. These thermoplastic photocurable ladder-like structured materials were examined as scratch-resistant, hard-coating materials on both glass and PET substrates. The unique fully...
This study explores how the rheological and crystallization properties of linear polypropylene (PP) are changed by incorporating fibrillated polyethylene terephthalate (PET). PET domains are fibrillated by melt blending with PP followed by drawing. In uniaxial extensional flows, the PP/fibrillated-PET shows strain hardening behavior, not observed for PP/PET blends with spherical PET domains or for...
In this study, the morphology and miscibility of poly(lactic acid), PLA, and poly(butylene adipate-co-terephthalate), PBAT, blends were studied in detail. Three techniques to examine the morphology of PLA/PBAT are compared: SEM using lower secondary electron imaging (LEI), SEM using low-angle backscattered electrons (LABE) and atomic force microscopy (AFM). The interfacial tension of the system was...
Novel magnetite-carbon nanofiber hybrids (denoted by “Fe3O4@CNFs”) have been developed by coating carbon nanofibers (CNFs) with magnetite nanoparticles in order to align CNFs in epoxy using a relatively weak magnetic field. Experimental results have shown that a weak magnetic field (∼50 mT) can align these newly-developed nanofiber hybrids to form a chain-like structure in the epoxy resin. Upon curing,...
In this study, cellulose nanocrystals (CNCs) are incorporated into a waterborne epoxy resin following two processing protocols that vary by order of addition. The processing protocols produce different levels of CNC dispersion in the resulting composites. The more homogeneously dispersed composite has a higher storage modulus and work of fracture at temperatures less than the glass transition temperature...
Rylene bisimide-based nanoparticles with cross-linked core were synthesized by site-selective cross-linking and self-assembly of block copolymer composed of poly(N-vinyl amine) and poly(N-isopropylacrylamide), which was prepared by RAFT polymerization. Single-step imidization of poly(vinyl amine)-b-poly(NIPAM) with arylene dianhydride derivatives, including naphthalene-1,8:4,5-tetracarboxylic dianhydride...
A multi-stimuli-responsive copolymer consisting of a thermoresponsive block and a thermo- and pH responsive block forms different types of self-assemblies in aqueous solution. These self-assembled structures may be inverted by varying temperature and pH and may be used for controlled loading and release of both hydrophobic and hydrophilic guest molecules. This polymer forms vesicles in water at neutral...
A dye-sensitized solar cell (DSSC) was fabricated with a viologen polymer as a charge-storable electrode and an aqueous electrolyte. The polyviologen was prepared via electrolytic polymerization of the 4-cyanopyridine moiety: It displayed reversible two-electron redox reactions at −0.48 and −0.86 V vs. Ag/AgCl in the aqueous electrolyte, which were appropriate for the acceptance of an electron from...
Fourier Transform Infrared and Broadband Dielectric Spectroscopies were applied to follow kinetics as well as molecular dynamics upon step-growth polymerization of bisphenol-A diglycidyl ether (DGEBA) with aniline both in bulk and in anodic aluminum oxide (AAO) membranes. For the first time the dynamics and kinetics of a curing epoxy system under confinement were analyzed and compared with the reaction...
The objective of this study was to evaluate the effects of fluorination on the antimicrobial and biofilm-controlling activities of N-halamine-based additives for polymers. A fluorinated N-halamine, 1-chloro-3-1H,1H,2H,2H-perflurooctyl-5,5-dimetylhydantoin (Cl-FODMH), and its un-fluorinated counterpart, 1-chloro-3-octyl-5,5-dimethylhydantoin (Cl-ODMH), were synthesized and characterized with FT-IR,...
An in-situ process for the grafting of a common poly(ionic liquid), poly(1-ethyl-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide), from natural cotton was developed. Unexpectedly and only found for this special morphology, the PIL coating even at a weight fraction as low as 3.4 wt%, could run accelerated activation of cotton into porous carbons at temperatures above 600 °C under nitrogen. During...
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