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This paper describes the feasibility of achieving melt-processable polyacrylonitrile copolymer precursors for producing high strength carbon fibers. High molecular weight poly(acrylonitrile-ran-methyl acrylate) (PAN-MA) copolymers with high acrylonitrile content were mixed were various binary melting point modifiers with one component being water to produce systems that formed stable melts at temperatures...
Water-cast films of two ethers of cellulose, hydroxypropylcellulose (HPC) and hydroxyethylcellulose (HEC), with dispersed silica particles, were deposited on flat substrates. X-ray specular reflectivity was used to characterize the structure of these solid ca. 1000Å thick films as a function of the added colloidal fraction. It was shown that the structural changes resulting from increasing amounts...
Nanometer-scale thick liquid films of poly(methylhydro-dimethyl)siloxane copolymer (PMDMS) deposited on hydrophilic and hydrophobic solid organic films have been studied using synchrotron X-ray specular reflectivity (XRR). The physico-chemical properties of liquid PMDMS at the interfacial level are controlled by the nature of the solid surface. Detailed analysis of the XRR-data revealed the formation...
Polypropylene (PP) was lightly maleated by solid-state graft polymerization and further neutralized to prepare semicrystalline ionomers, H + -, Na + -, Ca 2+ - and Mn 2+ -form maleated PP (mPP). The crystallization kinetics of pure PP and these ionomers have been investigated under isothermal and non-isothermal conditions. Under both conditions, the introduction of...
Poly(amic acid) (PAA) and poly(amic diethyl ester) (PAE) precursors of poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA), which is a representative polyimide (PI) being used widely in the microelectronic industry as an interdielectric material, were synthesized. The miscibility behavior of these precursors with poly(arylene ether benzimidazole) (PAEBI), which is known to exhibit strong cohesive...
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