聚二甲基硅氧烷

AbstractIn the current study, the AF properties of carbon nanotubes (CNTs)-modified polydimethylsiloxane (PDMS) nanocomposites were examined via the field assays. The impact of the CNTs incorporated in PDMS on the biological colonization and successional dynamics of the pioneer natural biofilm communities was investigated using the single-stranded conformation polymorphism (SSCP) technique.

AbstractMicrobial biofilm formation on composite surfaces has posed potential threats to the composite\"s structural integrity, durability and physical properties. Pioneer eukaryotes have been reported to be primarily responsible for the degradation of a wide range of composite materials. In this study, different carbon nanotubes (CNTs) were incorporated in the polydimethylsiloxane (PDMS) matrix respectively, in order to create CNTs-filled PDMS composites (PCs) with improved anti-biofouling properties.

Electrospinning technique was used to convert polydimethyl siloxane (PDMS) sol-gel solution to a new nanostructure on a stainless steel wire. The surface morphology of the fiber was observed by scanning electron microscopy (SEM). It showed a diameter range of 30-60nm for PDMS nanoparticles with a homogeneous and porous surface structure. The applicability of this coating was assessed for the headspace SPME (HS-SPME) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples followed by gas chromatography-mass spectrometry.

A series of blends of polydimethylsiloxane (PDMS) and indomethacin (IMC), containing 20-80 wt.% IMC were obtained and characterized by differential scanning calorimetry, Fourier transform-infrared spectroscopy, and powder X-ray diffraction in order to observe the mutual influence of the two components. The main thermal transitions of PDMS remained un-changed. Both the solvent (tetrahydrofuran, THF) and the PDMS influenced the crystalline form of IMC.

Abstract\n\t\t\t\t\n\t\t\t\t\tThe block copolymer poly(2,6-dimethyl-1,4-phenylene ether)-\n\t\t\t\t\t\tb-polydimethylsiloxane (PPE-\n\t\t\t\t\t\tb-PDMS) was prepared via hydrosilylation between poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and polydimethylsiloxane (PDMS) homopolymers. The formation of block copolymer was confirmed by \n\t\t\t\t\t\t1H NMR and DSC analyses. The block copolymer films were treated by supercritical carbon dioxide (scCO\n\t\t\t\t\t\t2) at moderate temperatures under high pressure of 25\n\t\t\t\t\t\tMPa for 2\n\t\t\t\t\t\th followed by depressurization.

Abstract\n\t\t\t\t\n\t\t\t\t\tHydroxy-terminated polydimethylsiloxane (PDMS) was incorporated into the soft segments of UV-curable polycarbonate-based polyurethane (meth)acrylate dispersions to improve the thermal property and surface property. 2-Hydroxymethacylate or pentaerythritol tri-acrylate was end-capped with or without PDMS to confirm the effect of the functionality of the end-capping group on the properties. Owing to the hydrophobicity of siloxane, the cured coating films containing PDMS had low surface free energy, and higher thermal degradation temperature.

Abstract\n\t\t\t\t\n\t\t\t\t\tPolyimide-polydimethylsiloxane (PI-PDMS) hybrids were synthesized by combining an in situ sol–gel reaction of diethoxydimethylsilane (DEDMS) and imidization of poly(amide acid) (PAA) prepared from pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA). Transparent hybrid films were obtained with up to 3\n\t\t\t\t\t\twt.% PDMS content corresponding to the relatively small domain size of PDMS as confirmed by scanning electron microscopy.

The coloration behavior of the inorganic/organic hybrids prepared from polydimethylsiloxane (PDMS) and chemically modified metal alkoxides was investigated by ultraviolet-visible (UV-VIS), X-ray photoelectron (XPS) and electron spin resonance (ESR) spectroscopies. Although the hybrids were transparent in the visible region, a broad absorption was observed from the visible to UV regions, leading to a color from yellow to wine-red. The color and the absorption edge of the hybrids depend on the inorganic components derived from metal alkoxides.

Molecular-level and particle-dispersed inorganic-organic hybrids, containing TiO2 as the inorganic component, have been prepared in order to study the effect of the introduced inorganic phase dimension on the structure and properties of the hybrids. The hybrids prepared from silanol-terminated polydimethylsiloxane (PDMS) and titanium ethoxide (Ti(OEt)4) in the molar ratios of Ti(OEt)4/PDMS=1, 2 and 4 were transparent with no visible particles, thus considered as molecular-level hybrids.

Details are presented for the formulation, fabrication, and mechanical characterization of mesoscopic freestanding polydimethylsiloxane (PDMS) elastomer membranes, 10.0 microm thick and 5.0 mm in diameter, used to probe the rheology of a living epithelial sheet. In what is described as a composite diaphragm inflation (CDI) experiment, freestanding PDMS membranes are utilized as substrates for the culture of a sheet of epithelial cells.