Journal
MOLECULES
Volume 28, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/molecules28062614
Keywords
polydimethylsiloxane foam; hollow glass microsphere; silicone chemistry; thermal insulation; lightweight
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We report a green, simple and low-cost strategy to synthesize ultra-low-density porous silicone composite materials using Si-H cross-linking and foaming chemistry. Sialylation-modified hollow glass microspheres were used to promote the compatibility between hollow microspheres and polydimethylsiloxane (PDMS). The modified PDMS foam composites showed excellent mechanical flexibility and good thermal insulation.
The feature of low-density and thermal insulation properties of polydimethylsiloxane (PDMS) foam is one of the important challenges of the silicone industry seeking to make these products more competitive compared to traditional polymer foams. Herein, we report a green, simple, and low-cost strategy for synthesizing ultra-low-density porous silicone composite materials via Si-H cross-linking and foaming chemistry, and the sialylation-modified hollow glass microspheres (m-HM) were used to promote the HM/PDMS compatibility. Typically, the presence of 7.5 wt% m-HM decreases the density of pure foam from 135 mg/cm(-3) to 104 mg/cm(-3) without affecting the foaming reaction between Si-H and Si-OH and produces a stable porous structure. The optimized m-HM-modified PDMS foam composites showed excellent mechanical flexibility (unchanged maximum stress values at a strain of 70% after 100 compressive cycles) and good thermal insulation (from 150.0 degrees C to 52.1 degrees C for the sample with similar to 20 mm thickness). Our results suggest that the use of hollow microparticles is an effective strategy for fabricating lightweight, mechanically flexible, and thermal insulation PDMS foam composite materials for many potential applications.
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