Poly(vinyl alcohol) (a), its partially hydrolyzed product or poly(vinyl alcohol-co-vinyl acetate) (b) and poly(ethylene-co-vinyl alcohol) (c) are all industrially significant polymers used mainly for fiber and film, size and emulsifier/stabilizer, and gas-barrier material, respectively. In this thesis, these vinyl alcohol-based polymers have been discussed from two aspects: the molecular struct...

In this work, poly(lactic acid) (PLA) dimer model compounds with different tacticities were synthesized and studied in detail by 1H and 13C nuclear magnetic resonance (NMR) in three solvents, deuterated chloroform (CDCl3)/CCl4 (20/80 v/v), CDCl3 and dimethyl sulfoxide -d6. All of the peaks in the 1H and 13C NMR spectra were assigned with the help of two-dimensional NMR. Although the solvents we...

Responsive nanogels were synthesised via RAFT-mediated polymerisation-induced thermal self-assembly in cononsolvent mixtures of water and ethanol. The solvent mixture affected the particle size, tacticity properties.

Abstract The viscosities of poly(3-hydroxybutyrate) (PHB) with mixed tacticities were determined as functions temperature and shearing rate via plate–plate viscosimetry, fitted by a combined Herschel–Bulkley–Cross–Doolittle model while applying Carvalho et al.’s single-point correction. They compared to values slit obtained during processing at 428 K. In both cases, measured parameters function...

The crystal structures of highly crystalline isotactic and syndiotactic hydrogenated poly(norbornene)s [H-poly(NB)s], synthesized by the stereospecific ring-opening metathesis polymerizations norbornene followed complete hydrogenation, have been determined for first time on basis X-ray diffraction data analyses. similarity difference chain conformation packing mode in lattice clarified among th...

Stereoregular vinyl polymers, poly(2-vinyl pyridine)s (P2VPs), were synthesized to examine the tacticity effect on the induced circular dichroism (ICD) via association with chiral acids. The ICD was found to be strongly dependent on the isotacticity of the P2VPs and the acidity of chiral acid in addition to its bulkiness.

Theoretical calculations are performed to explore the origin of inherent tacticity in bulky methacrylates. Geometries and conformer distributions of monomers and oligomeric propagating radicals are calculated to study the impact of steric bulk and π-stacking interactions on the preferences for meso versus isotactic propagation. Consistent with the previous qualitative analyses by Satoh and Kami...