In another study [53], they reported a 40% reduction in CO 2 permeability through the PU film with incorporation of only 3.3 wt % modified vermiculite clay in the PU matrix by master-batch-based ...Web

One problem is loss of blowing gases, which leads to slow increase in thermal conductivity. PU composites with plate-like nanofillers create a diffusion barrier, reducing gas transport and slowing insulation aging. In this research, a new in situ intercalative polymerization is described to disperse vermiculite (VMT) in PU.Web

clay, perlite, vermiculite, glass wool, sand, or; volcanic ash. ... Synthetic sorbents include man-made materials that are similar to plastics, such as polyurethane, polyethylene, and polypropylene. They are designed to adsorb liquids onto their surfaces. Other synthetic sorbents include cross-linked polymers and rubber materials, which …Web

Mostly, clay minerals, such as montmorillonite, hectorite, synthetic mica, and vermiculite are used to prepare clay mineral/polymer nanocomposites. These types of clay minerals have around 1 nm size of a layer thickness and can easily be exfoliated in a polymer matrix with help of some modifications. The modifications are indeed crucial ...Web

Modification with tertiary amine catalysts improves vermiculite dispersion in polyurethane via in situ intercalative polymerization. Yuqiang Qian, Wenhao Liu, Yong Tae Park, Chris I. Lindsay, Rafael Camargo ... In situ intercalative polymerization is an environmentally-friendly process to produce polymer-clay nanocomposites with good clay ...Web

The vermiculite clay belongs to the family of 2:1 layered phyllosilicates and can result from the change of mica by the ion exchange in the tri-octahedral smectites. ... and evaluate composites of raw vermiculite (RV) or expanded vermiculite (EV) in a vegetable polyurethane resin (VPR) matrix as thermal insulation eco-bricks. First, RV …Web

The peak at 8.6° (d 001 =10.3 Å) is attributed to the {001} diffraction of K-vermiculite and the peak at 7.1° (d 001 =12.4 Å) is attributed to an interstratified layer spacing in between two ...Web

When VMT was modified by cation exchange with long-chain quaternary ammonium, the dispersion in methylene diphenyl diisocyanate (MDI) was significantly improved. …Web

Vermiculite is a swelling hydrous phyllosilicate clay mineral with an ideal chemical formula of (Mg 2+, Fe 2+, Fe 3+) 3 [(SiAl) 4 O 10]OH 2 ⋅4H 2 O . Vermiculite is …Web

Significant loss of life and property results each year from fires fueled by polyurethane found in furnishings. Established layer-by-layer flame retardant systems were combined to produce a stacked nanocoating for flame retarding polyurethane . A bilayer system of chitosan (CH) and vermiculite provides a nanobrick wall …Web

Nanocomposites of rigid polyurethane with unmodified vermiculite clay are synthesized. The clay is dispersed either in polyol or isocyanate before …Web

Abstract. Vermiculite is a natural clay that has significant exfoliation characteristics. The exfoliated vermiculite has much lighter density and water retaining …Web

The vermiculite was modified with tertiary amine catalytic sites and long alkyl chains by Qian et al. to form an organo-vermiculite (Q50-VMT), which could be used to prepare polyurethane ...Web

of the clay layers and the existence of an ideal content of vermiculite (VMT) incorporated in the matrix. Keywords: polyurethane s; polymer–clay composites; flame retardantWeb

In the present study, the suitability of using water treatment sludge (WTS) as the main raw material and expanded vermiculite (EV) as aggregate in the production of fired bricks was investigated. Mixtures containing between 75%– WTS by weight (wt.) and 5%–25% EV by wt. were prepared at various proportions.Web

Micron and submicron-sized vermiculite lamellar particles with nanometric thickness (< 10 nm) were prepared by ultrasonic treatments (< 12 h) of aqueous and hydrogen peroxide suspensions of thermally exfoliated vermiculite. Laser granulometry characterizations showed that the particles size distribution was dependent on the …Web

In this work, the effect of natural (NV) and expanded (EV) vermiculite clays on the properties of biopolyethylene (BioPE)-vermiculite clay biocomposites was …Web

Figure 3 shows the X-ray diffraction patterns of conventional rigid polyurethane , vermiculite clay, and the nanocomposites with vermiculite clay. The peaks at 20 ?6.0° and 19.3° in vermiculite clay correspond to d-spacing of 10.1 and 4.6 Å, respectively. The peak ([d.sub.001]) at 10.1 Å diffuses and shifts slightly toward lower 2? …Web

The size of the vermiculite fillers' particles was assessed by polyol dispersion (0.04 g L −1), using the dynamic light scattering method.The particle size distribution of the unmodified vermiculite filler (V) and the vermiculite fillers modified with casein (VC), chitosan (VCH), and potato protein (VPP) are presented in Figure 2.The results indicate …Web

Differential scanning calorimetry and dynamic mechanical analysis revealed that the nanoclay interacts with the polyurethane hard segments. Expand. 92. Save. Applying vermiculite-modified polypropylene film to flexible packaging material ... Vermiculite (VMT) as clay was introduced into a ternary polymer blend composed of …Web

In lab tests, the flexible coating was applied to polyurethane , of the type that is commonly used for furniture cushions. ... (yes, tiny plates) of vermiculite clay. As the solution dries, it ...Web

The thermal shielding behavior of this polymer/clay nanocoating makes this system very attractive in improving the fire safety of polyurethane used for insulating applications. Keywords: chitosan; fire protection; insulation; layer-by-layer; polyurethane s; vermiculite.Web

The effects of composite modifications were evaluated by X-ray diffraction (XRD), thermogravimetric analysis (TG/DTG), and scanning electron microscopy (SEM/EDS) applied to the flame retardancy explored by the vertical burn test. The results indicated that adding clay controlled the particle size concerning polyurethane (PU) s.Web

PU/VMT composites were successfully synthesized by the casting molding method. The mixture of vermiculite with PU provided good dispersion and proportionality, given the added compositions of the clay. The PU/VMT15% composite is uniform, reinforcing the cost-benefit issue with environmental and economic advantages.Web

Flexible polyurethane (PUF) is widely used in bedding, transportation, and furniture, despite being highly flammable. In an effort to decrease the flammability of the polymer, an environmentally friendly flame retardant coating was deposited on polyurethane (PUF) via layer-by-layer assembly. Treated was subjected to …Web

Additionally, among these polymer materials, polyurethane has increasingly attracted the attention of researchers to carry out studies on PU-based polymer concrete or PU-cement concrete/mortar [6 ...Web

DOI: 10.1016/JPOSITESB.2021.109035 Corpus ID: 236289036; A novel vermiculite/ vegetable polyurethane resin-composite for thermal insulation eco-brick production @article{Rabello2021ANV, title={A novel vermiculite/ vegetable polyurethane resin-composite for thermal insulation eco-brick production}, author={Lucas Gomes …Web

In mechanical properties, about 1.4% PCL/clay in PU/clay resulted in a large increase in the elongation of PU/clay. However, when the amount of PCL/clay was 4.2%, the elongation of PU/clay was ...Web

A thermally insulating vermiculite nanosheet–epoxy ... serpentine and other clay minerals. 6 Vermiculite is an exciting and naturally occurring clay-based layered material. 7 It has ... nanosheets, 19 aerogels, 20 polyurethane-based vermiculite composites, 21 heterostructures 22 and clay along with polyethylenimine and chitosan ...Web

Physical and chemical properties of gamma-irradiated styrene–butadiene rubber/vermiculite clay nanocomposites modified using maleic anhydride. Polymer Bulletin 2018, 75 (8), 3587-3606. DOI: 10.1007/s00289-017-2227-4. ... Formation and characterization of polyurethane-vermiculite clay nanocomposite s. Polymer …Web

DOI: 10.1016/J.CLAY.2017.12.049 Corpus ID: 102819805; Effects of exchanged cation, acid treatment and high shear mechanical treatment on the swelling and the particle size distribution of vermiculiteWeb

In another study [53], they reported a 40% reduction in CO 2 permeability through the PU film with incorporation of only 3.3 wt % modified vermiculite clay in the PU matrix by master-batch-based ...Web