A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of polydimethylsiloxane viscosity on silica fume-based geopolymer hybrid coating for flame-retarding plywood
Graphical abstract Display Omitted
Highlights PDMS doped silica fume-based geopolymer hybrid coating is prepared. PDMS modified geopolymer coating holds enhanced fireproof property. PDMS viscosity of 350 cps exerts the highest flame resistance. Appropriate PDMS triggers the crosslinking Q4 1 and Q4 2 groups.
Abstract Hydroxyl-terminated polydimethylsiloxane (PDMS) modified silica fume-based geopolymer explores a novel challenging and interesting flame-retardant hybrid coating, and the effect of PDMS viscosity on the flame resistance and microstructure is investigated firstly. The optimum kinetic viscosity of PDMS is estimated as 350 cps according to the results of cone calorimeter (CC), which imparts a 50% decreased fire growth index (FGI) with the fire performance index (FPI) of 3.80 s·m2·kW−1 to the hybrid coating. The incorporation of PDMS renders the decreases in the weight loss percent (52.51%) and the average combustion velocity Vac (6.74 × 10−2%·s−1), as well as excellent smoke suppression. The doped PDMS (350 cps) facilitates the transformation from Q4 0 (no aluminum ion in Si-O-Si chains) to Q4 1 or Q4 2 groups (one or two aluminum ions Al3+ replace the pristine Si4+) involved in geopolymer coating, evidenced by the results of 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR) spectra, leading to a continuous, compact, and intact barrier layer from microstructure analysis. Moreover, the retarding mechanism of PDMS in the hybrid coating is elucidated including physical filling, heat sink effect of Si-O- chains, hydrogen bonding, and crosslinking. However, excessive PDMS viscosity exerts adverse flame resistance to the silica fume-based geopolymer hybrid coating.
Effect of polydimethylsiloxane viscosity on silica fume-based geopolymer hybrid coating for flame-retarding plywood
Graphical abstract Display Omitted
Highlights PDMS doped silica fume-based geopolymer hybrid coating is prepared. PDMS modified geopolymer coating holds enhanced fireproof property. PDMS viscosity of 350 cps exerts the highest flame resistance. Appropriate PDMS triggers the crosslinking Q4 1 and Q4 2 groups.
Abstract Hydroxyl-terminated polydimethylsiloxane (PDMS) modified silica fume-based geopolymer explores a novel challenging and interesting flame-retardant hybrid coating, and the effect of PDMS viscosity on the flame resistance and microstructure is investigated firstly. The optimum kinetic viscosity of PDMS is estimated as 350 cps according to the results of cone calorimeter (CC), which imparts a 50% decreased fire growth index (FGI) with the fire performance index (FPI) of 3.80 s·m2·kW−1 to the hybrid coating. The incorporation of PDMS renders the decreases in the weight loss percent (52.51%) and the average combustion velocity Vac (6.74 × 10−2%·s−1), as well as excellent smoke suppression. The doped PDMS (350 cps) facilitates the transformation from Q4 0 (no aluminum ion in Si-O-Si chains) to Q4 1 or Q4 2 groups (one or two aluminum ions Al3+ replace the pristine Si4+) involved in geopolymer coating, evidenced by the results of 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR) spectra, leading to a continuous, compact, and intact barrier layer from microstructure analysis. Moreover, the retarding mechanism of PDMS in the hybrid coating is elucidated including physical filling, heat sink effect of Si-O- chains, hydrogen bonding, and crosslinking. However, excessive PDMS viscosity exerts adverse flame resistance to the silica fume-based geopolymer hybrid coating.
Effect of polydimethylsiloxane viscosity on silica fume-based geopolymer hybrid coating for flame-retarding plywood
Wang, YaChao (author) / Zhao, JiangPing (author) / Chen, Jinglong (author)
2019-12-05
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2018