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We study the molecular origins of anisotropy in a semicrystalline polymer nanocomposite that is caused by aligned, elongated filler nanoparticles. Our study is based on spatially resolved 2D WAXS/SAXS data that indicates the arrangement of molecules, lamellae, and filler particles in the composite. Isotactic polypropylene (IPP) samples filled with anisotropic TiO2 nanoparticles were prepared by injection...
Two donor-π-acceptor (D-π-A) type low bandgap (LBG) conjugated polymers, namely, PT-DTNT-DT and PTT-DTNT-DT, consisting of thiophene (T) and/or thieno[3,2-b]thiophene (TT) as donor moiety, two flanking 2-decyltetradecylthienyl as π-bridges and large planarity and strong electron-withdrawing naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT) as acceptor moiety have been developed and systematically investigated...
Block copolymer micelles and vesicles are mostly prepared by the solvent mixing method, where the block copolymer is first dissolved in a common solvent for both blocks, which is then mixed with a selective solvent, mostly water, to induce self-assembly into the desired structure. Using a combination of microfluidic flow-focusing and capillary interdiffusion experiments combined with in-situ small-angle...
Electrospinning of polylactide (PLA) solutions produces coarse nanofibers mixed with numerous beads at the adopted conditions. Incorporation of ionic liquids with high conductivity in the solutions, however, promotes formation of fine PLA nanofibers with diameters of about 70 nm. It corresponds to significant stretching of the solutions as well as remarkable molecular alignment under the electrical...
Cold crystallization of electrospun fibers from poly (l-lactide)/poly (d-lactide) = 5/5 blends results in profuse stereocomplex crystals with little trace of homocrystals. In contrast, homocrystals prevail in the solution cast and melt-quenched films with same composition upon cold crystallization. With aid of FTIR technique it is confirmed that intermolecular ordering between poly (l-lactide) and...
The clinical application of gambogic acid (GA), a natural component with promising antitumor activity, was limited due to its extremely poor aqueous solubility, rapid elimination in vivo, and wide biodistribution. To solve these problems, 30 poly(ethylene glycol)-amino acid (or dipeptide)-gambogic acid (PEG-spacer-GA) conjugates were synthesized. All polymeric prodrugs showed satisfactory aqueous...
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