An investigation of the influence of polymeric surfactants on the structure and properties of polyurethane foams

Medvedev, V. P.; Нистратов, А. В.; Stukalov, K. S.; Shatalova, L. N.; Pyl’nov, D. V.; Petrosyan, E. V.

doi:10.1134/s1995421213030155

Cited by 1 publication

(2 citation statements)

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“…This was because the high proportion of surfactant reduced the surface tension of the resin, contributed to maintaining the stability of the cells, and decreased the combination and collapse of cells. Lim et al also demonstrated that the closed cell content increases asymptotically with increasing surfactant concentration [17]. A comparison of the two surfactants we used in this study showed that DPF foams (prepared with DC-193) had a higher content of closed cells than the TPF foams prepared with Tween-80 in Fig.…”

Section: Microstructure Of the Foammentioning

confidence: 84%

“…Additionally, Lim et al demonstrated that silicon surfactants can reduce the surface tension of the foaming system, preventing adjacent cells from combining and making the closed cells of the polyurethane foam [13]. While a number of studies have been conducted to examine the effects of various surfactants on the cellular structure and mechanical properties of polyurethane foams [14][15][16][17][18][19], studies examining the effects of surfactants on phenol-urea-formaldehyde foam are much less common.…”

Section: Introductionmentioning

confidence: 99%

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Effects of surfactants on the mechanical properties, microstructure, and flame resistance of phenol–urea–formaldehyde foam

Cheng

et al. 2015

Polym. Bull.

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To study the effect of surfactants on the foaming behavior of phenolurea-formaldehyde foam, silicone oil and Tween-80 surfactants were selected to study their effects on the mechanical properties, microstructure, and combustion characteristics of the foams. The results show that the surface tension of the phenol-urea-formaldehyde resins decreased with increasing surfactant concentration. Both the foaming temperature and foaming capacity of the phenol-urea-formaldehyde foam first increased and then decreased with increasing surfactant concentration. The compressive strength and oxygen index of the phenol-urea-formaldehyde foam first decreased and then increased with increasing surfactant concentration, which is probably related to the foaming capacity of the foam. The microstructure of the foams showed that the average pore diameters first increased and then decreased with increasing surfactant concentration. The combination of DC-193 and Tween-80 surfactants significantly improved the compressive strength, uniformity of the cells, and the number of closed cells in the final foam product.

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Section: Microstructure Of the Foammentioning

confidence: 84%