Flexible thermoplastic composite of Polyvinyl Butyral (PVB) and waste of rigid Polyurethane foam

Abstract

SbstractThis study reports the preparation and characterization of composites with recycled poly(vinyl butyral) (PVB) and residue of rigid polyurethane foam (PUr), with PUr contents of 20, 35 and 50 wt %, using an extruder equipped with a Maillefer single screw and injection molding. The components of the composites were thermally characterized using differential scanning calorimetry (DSC) and thermogravimetry. The composites were evaluated by melt flow index (MFI), tensile and hardness mechanical tests and scanning electron microscopy (SEM). Tg determined by DSC of PVB sample (53 °C) indicated the presence of plasticizer (Tg of pure PVB is 70 °C). MFI of the composites indicated a viscosity increase with the PUr content and, as the shear rate was held constant during injection molding, higher viscosities promoted higher shear stresses in the composites, thereby causing breaking or tearing of the PUr particles. The SEM micrographs showed low adhesion between PVB and PUr and the presence of voids, both inherent in the rigid foam and in the interphase PVB-PUr. The SEM micrographs also showed that PVB/PUr (50/50) composite exhibited the smallest particle size and a more homogeneous and compact structure with fewer voids in the interface. The stiffness of the composites increases with addition of the PUr particles, as evidenced in the mechanical tests.

NIR shielding performance and spectral selectivity of PVB interlayer films loaded with composite fillers derived from CsWO3 coupled with Au nanorods

“…34 Next, thermal decomposition of the PVB molecules occurred at the onset temperature of 310 1C and that can be ascribed to the elimination of butyral groups in the PVB molecules. 35 This led to the formation of polyene as an intermediate product accompanied by butyraldehyde as a by-product. 34 Above this temperature, the polyene intermediate further decomposed, leading to a low molecular weight product (such as acetic acid 36 ) and residual products, which accounted for 0.31 wt%.…”

Urea-Based Patches with Controlled Release for Potential Atopic Dermatitis Treatment

“…The difference between the first and second cycle of samples heating is noticeable, as two peaks for the PVB samples near the glass transition temperature (Tg) are indicated in Figure 2 B, but in Figure 2 C only one peak is presented. Electrospinning used for membrane production affecting the polymer chain alignment in fibers resulted in the structural changes of the produced materials that are represented by the glass transition temperature variation [ 38 , 39 ]. For PVB fibers, Tg reached 74 °C, while for membranes containing urea it was slightly reduced.…”

Thermal properties of poly(vinyl butyral)/iron oxide composite nanofibers

“…It has extensive use as the interlayer in laminated safety glass, ceramic and composite fiber binders, electrode modification and anticorrosive coatings [23][24][25][26]. The hydrophobic vinyl butyral unit adds processability, elasticity, toughness and compatibility and shape-memory property while the hydrophilic vinyl alcohol and vinyl acetate moieties afford good adhesion and bonding, particularly with inorganic materials [27,28]. The amount of molar ratio of acetate groups may also affect some properties of the copolymer such as chemical, physical and mechanical properties, solubility, hydrophilic and hydrophobic interactions, melting point and crystallinity [29].…”