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The present article describes the experimental and theoretical observations on the formation of holographic, polymer-dispersed, liquid crystals and electrically switchable, photonic crystals. A phase diagram of the starting mixture of nematic liquid crystal and photo-reactive triacrylate monomer was established by means of differential scanning calorimetry (DSC) and cloud point measurement. Photolithographic...
The phase behavior and separation dynamics have been investigated in blends of diglycidyl ether of bisphenol A (DGEBA), curing agent methylene dianiline (MDA), and a reactive liquid rubber (R45EPI) through application of differential scanning calorimetry (DSC), one- and two-dimensional light scattering, and optical microscopy. DSC analysis indicates that the system consists of three reactions: the...
In the present study, various diffusive processes have been investigated during foaming of powdered precursors of polyimide. A detailed analysis of the powdered precursor's characteristics allows for an enhanced morphological understanding of the resulting microstructures and foam unit cell. Parameters that are central to the foaming process such as particle morphology, volatile concentration and...
Mechanisms and dynamics of thermo-oxidative degradation of styrene-co-isoprene (SI) diblock at a temperature above the order–disorder transition temperature, T odt , have been investigated both experimentally and theoretically. The structural development of SI during degradation was monitored by optical microscopy, and the reduction of molecular weight and molecular weight distribution during...
Melting and crystallization behavior in mixtures of poly(vinylidene fluoride) (PVDF) and several ethylene-vinyl acetate copolymers (EVAc) with various ethylene contents have been investigated by means of differential scanning calorimetry, atomic force microscope, and optical microscopy. PVDF/EVAc-80 exhibits the melting point depression of PVDF crystals, suggestive of a miscible character of the pair...
Miscibility phase behavior in blends of SBS copolymers (Kraton 1101) and asphalt has been investigated through establishment of thermodynamic phase diagrams. The observed phase diagram of the SBS/asphalt blend is an upper critical solution temperature (UCST) type with a maximum at about 20% copolymer and around 200 o C. The study on kinetics of phase decomposition has been carried out by means...
To elucidate the emergence of liquid crystal (LC) domains during polymerization induced phase separation in a polymer dispersed liquid crystal (PDLC), numerical simulation has been performed by incorporating the kinetics of crosslinking reaction into the time-dependent Ginzburg–Landau (TDGL-Model C) equations in conjunction with the combined Flory–Huggins (FH)/Maier–Saupe (MS) free energies. The TDGL-Model...
The emergence of crystalline structures during phase transitions, involving crystallization and phase separation in blends of poly(vinylidene fluoride) (PVF 2 ) and poly(butylene adipate) (PBA) has been examined by means of time-resolved depolarized light scattering, polarizing optical microscopy, and differential scanning calorimetry. These PVF 2 /PBA blends are known to exhibit...
A new system for measuring saliva pH by radio telemetry was developed. The system was built into a lower complete denture and could operate for about 19 h. The maximum error in the range pH 5–8 was 0.15 pH, and the correlation when values were compared with those from a glass-electrode pH meter was 0.99. That this system operates successfully was confirmed in a clinical experiment.
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