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Gene therapy has shown great potential in the treatment of various diseases, and the development of low-toxic and efficient gene carriers is still one of the burning issues for gene therapy. PEGylation is generally regarded as an efficient strategy to improve the biocompatibility of non-viral vectors. However, PEGylation also led to several problems such as lower cellular uptake, difficult endosomal...
Theoretical investigation on the reaction of maleic anhydride (MAH) in the UV radiation cross-linking process of polyethylene as high voltage cable insulation materials is accomplished at B3LYP/6-311 + G(d,p) level. The reaction potential energy information of 10 reaction channels is identified. The results show that the UV radiation cross-linking reaction of polyethylene is initiated by benzophenone,...
Polyelectrolytes composed of an anionic sulfoethyl methacrylate/methacrylate backbone and cationic cyanine dyes counter ions are synthesized. The effective reaction sequence is confirmed by NMR spectroscopy and consists of a thermal radical copolymerization to obtain the polymer backbone (M n ∼ 40 kg mol −1 ), followed by deprotonation of the sulfoethyl group and a salt metathesis...
The failure analysis of reinforcing elements is of great significance to understand the structure-property relationship in polymer composites. Herein, we reported an improved methodology to ascertain and contrast the failure modes from one pair of homologous fracture surfaces of multi-walled carbon nanotubes (MWCNTs)/epoxy samples at high-magnification using scanning electron microscopy. Three possible...
Fracture behaviours of nanosilica filled bisphenol-F epoxy resin were systematically investigated at ambient and higher temperatures (23°C and 80°C). Formed by a special sol–gel technique, the silica nanoparticles dispersed almost homogenously in the epoxy resin up to 15vol.%. Stiffness, strength and toughness of epoxy are improved simultaneously. Moreover, enhancement on fracture toughness was much...
An effective route was demonstrated to fabricate vesicles, cylindrical micelles, fibers and hierarchical structures by using dendritic–linear amphiphilic diblock complex as building block through hydrogen bonding. We tailored the formation and evolution of these aggregation morphologies as well as the transformation among them, and found that the concentration and solvent polarity could affect the...
Full atomistic molecular dynamics simulations have been used to study the diffusion of alkane molecule in single wall carbon nanotube (SWCNT), with different alkane chain lengths and nanotube diameters. In this paper, we calculated the self-diffusion coefficient, mean-square gyration and bond-orientation order parameter of alkane molecule and the average intermolecular interaction energy per segment...
In the present study, the crack initiation fracture toughness of various nanoparticles filled polyamide 66 was investigated in a broad temperature range (23–120°C) by using an essential work of fracture (EWF) approach. Four types of spherical nanoparticles, i.e. two types of TiO 2 (21nm, with/without surface modification), SiO 2 (13nm) and Al 2 O 3 (13nm), were selected...
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