Microcosmic morphology and properties of hollow glass beads‐reinforced polylactic acid–based foam composites

Abstract

Polylactic acid (PLA)-based foam composites reinforced with hollow glass beads (HGBs) were prepared via a two-step process. First, the glass beads, PLA, foaming agent, and other additives were blended, supplanted, and pelletized. Second, the foaming masterbatch was introduced into the mold using thermocompressor to make the microfoam composites. The foam morphology, mechanical properties, and heat resistance were investigated. The experimental results show that the compressive strength of the composites achieved an optimal value when the mass fraction of HGBs was 15%, and that the elastic modulus of the composites increases with increasing bead contents. In addition, after doing a comparative analysis of composites with different bead contents, it was discovered that the foam morphology quality became more uniform and fine with the addition of the beads. Finally, it was found that inclusion of the beads enhanced the thermal stability of the composites and improved their thermal decomposition temperature by about 50 C. POLYM. COMPOS., 37:692-699,

Biobased Composites Prepared Using an Environmentally Friendly Water-Slurry Methodology

“…As shown in Figure a and Table , the Bzf-MMT benzoxazine composites exhibit a break strength of 25.3 MPa, which is similar to that of Bzf-CC (24.6 MPa) and much higher than that of the Bzf-HGMS composites (11.7 MPa). The weakness of the Bzf-HGMS composites may be contributed to the large size of the hollow glass beads and the poor adhesion capability with the polybenzoxazine resin. , These results suggest that the benzoxazine composites prepared by the water-slurry method have good mechanical properties and good applicability for filler particles.…”

“…A series of the water slurries are prepared by mixing water with the powder of 3-furfury-8-methoxy-3,4-dihydro-2 H -1,3-benzoxazine (Bzf) and a variety of fillers of calcium carbonate (CC), montmorillonite (MMT), or hollow glass beads (HGMS). These fillers have been applied in biobased composites due to their safety for environmental protection. − The composites fabricated using the water-slurry method are characterized and compared with previous studies of benzoxazine composites. − The curing behavior and rheological property of these water slurries are studied using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and rotational rheometer analyses, respectively. After composting with cotton fabric, mechanical and thermomechanical properties of the resulted composites are evaluated by elongation tests and dynamic mechanical analyses (DMA).…”

Effect of flame retardants on mechanical and thermal properties of bio-based polyurethane rigid foams

“…Rigid polyurethane foam (RPUF) is an economical and efficient energy-saving material that is widely used in elds of furniture, transportation, construction materials, refrigerator insulation because of its light weight, high strength, and excellent mechanical and thermal insulation properties. [1][2][3][4] However, its porous structure makes it easy to be ignited and burn rapidly aer being exposed to re, releasing large amounts of heat and smoke, leading to serious re accidents. 5,6 This limits the application of rigid polyurethane foam in many elds.…”

Effects of hollow glass microspheres on the polybenzoxazine thermosets: Mechanical, thermal, heat insulation, and morphological properties

“…In previous studies several resins such as polyurethane, 11 polylactic acid, 12 polystyrene, 13 high density polyethylene, 14,15 vinyl ester, 16,17 phenolic resins, 18 epoxies, 19–21 silicones, 22 poly(butylene succinate), 23 ethylene‐vinyl acetate 24 have been used as matrix material for syntactic foams. Kumar and coworkers 25 reported the mechanical properties of the polybenzoxazine based syntactic foams.…”