On the study of polyurethane Ionomer—Part I

Abstract

The reaction of toluene diisocyanate (TDI) with dimethylol propionic acid (DMPA) or diaminopentane sulphonic acid sodium salt and other additives to form the structure of anionic polyurethane (PU) ionomer molecule has been proven by FT-IR spectroscopy.In aqueous solution, the surface tension of anionic PU ionomer molecule is seen to slightly increase with increasing concentration of ES-200. This is because the adsorption of hydrophobic groups of ionomer molecules at the surface of aqueous solution becomes even more ordered. Under the same experimental conditions, the surface tension of anionic PU ionomer molecule appears to slightly decrease with increasing concentration of DMPA, as a result of increased hydrophobic groups of ionomer molecule adsorbed at the surface of aqueous solution. The number average particle size of anionic PU ionomer molecule in aqueous solution appears to steadily increase with an increase in the concentration of DMPA or ES-200. This is because the intermolecular interaction between ionomer±ionomer molecules themselves and between ionomer±water molecules may increase the free volume of anionic PU ionomer molecule, thus causing their number average particle size to increase.Experimental results indicate that both the tensile strength and the modulus of self-cured film of anionic PU ionomer molecule appear to decrease with increasing concentration of DMPA or ES-200, as a result of intramolecular interaction. However, the elongation of self-cured film of anionic PU ionomer molecule is seen to increase with increasing concentration of DMPA or ES-200. This may be the result of weakening crosslinking due to strong intramolecular interaction of ionomer molecule. For the peel strength of self-cured film of anionic PU ionomer coated on the fabric (30% polyester/ 70% cotton), it has been found that the peel strength increases with increasing concentration of DMPA or ES-200, as a result of increased hydrophilic interaction between ionomer molecules themselves.

Novel high dielectric constant nanocomposites of polyaniline dispersed with γ‐Fe2O3 nanoparticles

“…Room temperature conductivity data presented in Figure 6 for the plain PANI as well as PANI‐2, PANI‐5, and PANI‐10 samples showed only a marginal increase with increasing amounts of γ‐Fe 2 O 3 . This might be due to the ferromagnetic nature of γ‐Fe 2 O 3 , which might cause an internal magnetic field, thereby increasing the conductivity 33, 34…”

Electrospun biodegradable calcium containing poly(ester‐urethane)urea: Synthesis, fabrication, in vitro degradation, and biocompatibility evaluation

“…In ionic metal containing polymers, the ionic charges in the polymer creates physical crosslinking between the polymer chains, preventing chain slippage during loading thereby increasing the mechanical property of the polyurethane. It was also noticed that ionic forces enhances the cohesion of the polyol unit under stress resulting in increase in modulus and elongation at break 25. Sufficiently good mechanical strength makes this electrospun scaffold a potential candidate for various biomedical applications.…”

“…It was also noticed that ionic forces enhances the cohesion of the polyol unit under stress resulting in increase in modulus and elongation at break. 25 Sufficiently good mechanical strength makes this electrospun scaffold a potential candidate for various biomedical applications.…”

Modification and characterization of the poly(vinyl chloride)/thermoplastic polyurethane foam composite material

“…With a proper crosslinking degree, the foam will have great physical properties and fine, uniform cells [23]. The gel content is calculated by Eq.…”