The electrical conductivity and Seebeck coefficient of the PPy/GNs composites have been greatly enhanced as the GNs content increases, while the thermal conductivity still keeps a relatively low value.
Fabrication of size controllable polymeric hollow nanospheres with azo functional groups is of great interest for applications in biomedical engineering, electronics, optics, and diagnostics. We report here a facile and economic way of fabricating polymeric hollow nanospheres with azo functional groups using ionic selfassembly of random copolymers poly(acrylonitrile)-stat-poly(4-vinyl-pyridine) and azobenzene dye metanil yellow (MY). The size of the hollow nanospheres is homogeneous and can be conveniently controlled by varying molar ratios of the copolymers to MY and molar ratios of monomers of the copolymers. The composition of the polymeric nanospheres and the self-assembly behaviors were characterized by 1 H-NMR, FTIR, UV-Vis spectrophotometry, TEM, dynamic light scattering and elemental analysis. The formation process of hollow nanospheres was considered based on the results from UV-Vis spectrophotometry and TEM. Finally, the effects of azo complex composition on the morphology of the nanospheres were discussed, and the formation mechanism of polymeric hollow nanospheres was proposed.
In the present work, a rapid and novel route to prepare a diblock copolymer consisting of styrene and vinyl acetate (VAC) units was performed by successive photoinduced charge-transfer polymerization (CTP) under UV irradiation, and then a series of objective products PSm-b-PVAn bearing different ratios of PS and PVA was obtained by the hydrolysis of PSm-b-PVACn with sodium ethoxide as the catalyst. Additionally, the influences of the reaction time, concentration of monomer and photoinitiator and kinetics of copolymerization were investigated. Good linear relationships of ln([St] 0/[St]) and ln([VAc]0/[VAc]) with the polymerization time indicated a first-order control/‘living’ process. The copolymers were characterized in detail by means of Fourier transform infrared (IR) spectrometry, 1H NMR and gel permeation chromatography (GPC). Furthermore, the miscibility of the originally incompatible blend system was improved quite significantly, so a full atomistic molecular dynamics simulation was applied to discuss the binary and ternary systems through the Flory-Huggins parameters, enthalpy of mixing and Tg.
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