Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Abstract

A syntactic foam was prepared from an epoxy resin matrix and modified hollow glass microsphere fillers. Modification by silane coupling agents with different molecular structures was analyzed, and the optimal content of the silane coupling agent was determined. The results demonstrated that all silane coupling agents enhanced the adhesion between the hollow glass microspheres and epoxy resin matrix, resulting in enhanced water absorption, compressive performance, tensile performance, and bending performance compared to those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end groups, the one with a sulfhydryl end group exhibited optimal modification for hollow glass microspheres. Among the silane coupling agents with different backbone structures, the one with silanol groups exhibited the optimal modification of hollow glass microspheres. Additionally, the performance of the syntactic foams was optimal when 6% of the silanol-containing coupling agent was used. The results demonstrated that syntactic foams prepared with hollow glass microspheres modified by silane coupling agents exhibited improvements in water absorption, compressive performance, tensile performance, and bending performance, compared with those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end structures, the one with a sulfhydryl group as end group showed the best modification effect on hollow glass microspheres. The water absorption was 0.35%, the compressive strength was 62.15 MPa, the tensile strength was 40.15 MPa, and the bending strength was 53.17 MPa. Among silane coupling agents with different backbone structures, the one with silanol groupsbonds showed the best results. Its compressive strength was up to 64.15 MPa, the tensile strength was 35.47 MPa, and the bending strength was 53.99 MPa.

Effect of Hollow Glass Microspheres with Different Contents and Types on Properties of Polypropylene Composites

“…The absorption peaks at 3446 cm −1 and 1640 cm −1 belong to the groups of −OH and C=N, respectively. The ubiquitous presence of alkyl groups on the modified HGM surface proves that the coupling agent molecules are successfully connected to the surface of the HGM [4] …”

“…The ubiquitous presence of alkyl groups on the modified HGM surface proves that the coupling agent molecules are successfully connected to the surface of the HGM. [4] Figure 3 shows the XRD patterns of different samples. The HGM is amorphous.…”

“…Hollow glass microspheres (HGM) are microscale light materials composed mainly of borosilicate, which has various advantages, such as lightweight, high compressive strength, high dispersion, high stability, strong sound insulation, and waterproof. [1][2][3][4][5][6][7][8] Composite materials dispersed with rigid hollow particles such as hollow glass microspheres in a matrix show considerable prospects in the fields of navigation, aviation and construction. [9][10][11] polymer composites filled with HGM have been widely used in aerospace and marine fields, due to their lightweight.…”

Sunrise of PFAS Replacements: A Perspective on Fluorine-Free Foams

“…Currently, nitrogen, phosphorus, and silicon-containing surfactants and polymers are being tested . Also under consideration are formulations with various compositions that employ different mechanisms for fire suppression, e.g., hollow glass microspheres, ionic liquids, and gel foams . It is important to highlight that our analysis here is based on current compositions of replacements .…”

Investigation on preparation and mechanical properties of carbon fiber fabric/hollow glass beads/epoxy resin sandwich composite laminates

“…When the mass ratio of GO@HGM to the epoxy was 25/100, the density of composite reduced to 0.916 g cm À3 , and its compressive strength reached 96.5 MPa, 11.4% higher than that of HGM composites. Li et al [23] took silane coupling agent-modified HGM and EP to prepare syntactic foam. When the mass ratio of EP, curing agent, and HGM was 100:43.4:30, the compressive strength, tensile strength, and bending strength of the foams could reach 62.15, 40.15, and 53.17 MPa, increased by 47.6%, 60%, and 40%, respectively, compared with unmodified syntactic foams.…”