Polyurethane‐nanocomposite materials via in situ polymerization into organoclay interlayers

Abstract

New nanocomposite materials based on polyurethane intercalated into organoclay layers have been synthesized via in situ polymerization. The syntheses of polyurethane-organoclay hybrid films were carried out by swelling the organoclay [12-aminododecanoic acid montmorillonite] into different kinds of diols followed by addition of diisocyanate then casting in a film. The homogeneous dispersion of MMT in the polymer matrix is evidenced by scanning electron microscope and x-ray diffraction, which showed the disappearance of the peak characteristic to d 001 spacing. It was found that the presence of organoclay has improved the thermal, solvent resistance and mechanical properties. Also, the tensile strength is increased with increasing the organoclay contents to 20% by the ratio 182% related to the PU with 0% organoclay. On the contrary, the elongation has decreased with increasing the organoclay contents.

The Structure and Properties of a Novel Hydroxyl‐Terminated Hyperbranched Polymer for Inhibiting Shale Hydration

“…In the spectrum of dry bentonite modified by β‐CD‐HBP‐OH, the similar d 001 disappearance phenomenon was observable for the successful absorption of β‐CD‐HBP‐OH (Figure ). In polymer/montmorillonite composites preparations, the disappearance of d 001 was an indicator to confirm the combination between the polymer and montmorillonite …”

Nanocellulose and Its Application for Shape-Memory Materials

“…Polyurethane is synthesized by the reaction of low molecular weight polyols with diisocyanates and diols (chain extender). During the synthesis, polyols terminated with hydroxyl ends are reacted with the diisocyanates and diols, in order to form a urethane linkage [86]. The semicrystalline hard segments of polyurethane are formed with the aromatic or aliphatic diisocyanate through the molecular interactions between the urethane linkages by hydrogen bonding, while the soft segments are made up of polyols groups, as the switching segment.…”

Preparation and properties of waterborne bio-based polyurethane/siloxane cross-linked films by an in situ sol–gel process

“…Among these methods, the introduction of nano-particles into the WPUs to obtain organic-inorganic hybrid materials have attracted great interest in the past years, given that this method has significantly improved the mechanical, thermal, and barrier properties. Over the years, many nano-particles such as graphene oxide [11], silica [12][13][14][15][16][17][18][19], attapulgite [20,21], and organoclay [22][23][24] have been introduced into the waterborne polyurethane system to generate organic-inorganic hybrid materials. Among these nano-particles, nano-silica has provided excellent properties in WPU reinforcement.…”

“…To improve the properties of waterborne polyurethanes, several methods have been explored, such as the introduction of nano-particles [11][12][13][14][15][16][17][18][19][20][21][22][23][24], chemical cross-linking [4], and UV curing [25]. Among these methods, the introduction of nano-particles into the WPUs to obtain organic-inorganic hybrid materials have attracted great interest in the past years, given that this method has significantly improved the mechanical, thermal, and barrier properties.…”