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Although cellulose is the oldest macromolecule we have known, its intrinsic properties are still not well understood because of the lack of suitable solvents. The recent development of ionic liquids enables preparation of cellulose solutions in which cellulose molecules are supposed to be dispersed molecularly. Conventionally a semi-flexible-chain model or a worm-like chain model has been applied...
Nucleation mechanism of polymers was studied by means of small angle X-ray scattering (SAXS) by improving our two previous studies. The first one showed first direct SAXS observation of nucleation of polyethylene (PE). The second one reported how “size distribution f(N,t)” of nuclei of nano-meter size (nano-nuclei) evolves with time (t), where N is number of “repeating unit” in a nucleus. Unfortunately...
An oligomaltose-carrying polystyrene “glycoconjugate polystyrene” was synthesized by the homopolymerization of 4-vinylbenzylamine oligomaltonic amides, derived from maltose, maltotriose, maltopentaose, and maltoheptaose. The resultant amphiphilic glycoconjugate polystyrenes were dissolved in 0.1M aqueous urea, and their structures characterized by small-angle X-ray scattering and molecular modeling...
An experimental formula of the nucleation rate I of polyethylene as a function of number density of entanglement ν e within the melt was obtained as I(ν e ) exp(-γν e ), where γ is a constant. In order to obtain a functional form of I(ν e ), I is determined by changing ν e within the melt. The ν e within the melt can be changed when crystals with different...
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