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Currently held mean-field theories for microphase-separation in AB-type diblock and ABA-type triblock copolymers are reviewed and their limitations are highlighted. Numerical predictions, based on these theories, for the design of such block copolymers are also presented. It is emphasized that the use of a numerical algorithm leading to successful design and synthesis of block copolymers in terms...
For most industrial applications, exfoliation is much preferred to intercalation in organoclay nanocomposites. Mechanisms leading to exfoliated nanocomposites prepared by mixing are presented with specific examples reported in the literature. It is pointed out that in the preparation, via mixing, of nanocomposites based on thermoplastic polymers or thermoplastic elastomers, exfoliation of the aggregates...
Exfoliated nanocomposites based on polystyrene-block-polyisoprene-block-poly(2-vinylpyridine) (SI2VP triblock) copolymer were prepared by solution blending and melt blending. Their dispersion characteristics were investigated using transmission electron microscopy, X-ray diffraction, and small-angle X-ray scattering (SAXS). For the study, SI2VP triblock copolymers with varying amounts of poly(2-vinylpyridine)...
The dispersion characteristics of organoclay nanocomposites based on polystyrene-block-poly(2-vinylpyridine) (S2VP diblock) copolymer were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD), and solid-state nuclear magnetic resonance (NMR) spectroscopy. For the investigation, S2VP diblock copolymers having three different compositions were synthesized via sequential...
Hydrogenated functional polynorbornene (HFPNB) was first synthesized and then it was used to investigate the rheology of HFPNB-based miscible blends with hydrogen bonding. For the investigation, functional norbornene with carboxylic (–COOH) group was first synthesized and then it was polymerized, via ring-opening metathesis polymerization followed by hydrogenation, to obtain hydrogenated functional...
The dispersion characteristics and rheology of organoclay nanocomposites based on a main-chain liquid-crystalline polymer having side-chain azopyridine with flexible spacer (PABP) were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and oscillatory shear rheometry. In the preparation of nanocomposites via solution blending under vigorous stirring, two commercial...
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