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Synthesis and characterization of polyesters based on isosorbide/isoidide derived AB-monomers were reported. The homopolymers were prepared respectively by melt polycondensation of isosorbide 2(4-carbomethoxybenzoate), isosorbide 5(4-carbomethoxybenzoate) and isoidide (4-carbomethoxyphenyl ether). The chemical structure and properties of the synthesized polyesters were characterized by proton nuclear...
This paper describes the synthesis and characterization of a novel mesogenic monomer derived from isosorbide and biphenyl materials. This material exhibits smectic mesophases at high temperatures and shows a high thermal stability. These characteristics make this monomer an ideal candidate for polymerization to form high performance mesogenic polymers and potential applications as a biocompatible...
A new type of inorganic polymer flocculant, polysilicate boron ferric and zinc sulfate (PSBFZ), was prepared through reaction of sodium silicate, ferric sulfate, zinc sulfate and sodium tetraborate. The Optimal synthesis process and material mixture ratio were determined by Orthogonal and single-factor experiments. Experimental results demonstrated that the optimal preparation conditions were as follows:...
We investigated a pulse-time-modulated neutral-beam-enhanced CVD at a low substrate temperature of -70°C with dimethoxy-tetramethyl-disiloxane to form low-k SiOCH film. This method provided an ultimate low-k SiOCH film with a k-value of 1.3, a sufficient modulus of more than 5 GPa, and ultra-high thermal stability (no desorption of CH3 and H2O by 400°C annealing). This result is explained by the extremely...
The effects of prepolymer molecular weights on the thermal stability of nano-bismaleimide composite materials were studied in this paper. A series of composites with different prepolymer molecular weights are prepared by polymerizing nano-SiO2, chopped carbon fiber and bismalemide resin. Nano-composites are characterized by dynamic mechanical analysis and weight loss measurements after the short-term...
The ability of N-(4-carboxyphenyl) maleimide to act as a very effective and stable complexation agent for several transition metal ions, such as cobalt (II), copper (II), nickel (II), has been demonstrated. Polymer blends composed of poly(vinylidene difluoride) and some of the resulting metal complexes of N-(4-carboxyphenyl)maleimide were prepared by using solution casting technique. The resulting...
This paper presents the effect of nano-SiO2 on the thermal stability of composite materials. A series of composites with different nano-SiO2 contents are prepared by polymerizing nano-SiO2, chopped carbon fiber and bismalemide resin. Nanocomposites are characterized by dynamic mechanical analysis. The results indicate that the content of nano-SiO2 exhibit significant improvements on glass transition...
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