Preparation and Characterization of Melamine Modified Urea-Formaldehyde Foam

Ma, Yufeng; Zhang, W.; Wang, C.; Xu, Yuzhi; Li, S.; Chu, Fuxiang

doi:10.3139/217.2684

Cited by 14 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LOI was used to appraise the flammability of polymeric material, which was the minimum oxygen concentration that allowed flame burning in the mixture of oxygen and nitrogen . When the LOI was greater than 27%, the material was flame retardant .…”

Section: Resultsmentioning

confidence: 99%

Resorcinol in high solid phenol−formaldehyde resins for foams production

Liu

Chen

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

The acid curing agent content and foaming temperature could be reduced by improving the resol reactivity. In this study, highly active and solid phenol−resorcinol−formaldehyde copolymer resins (PRFRs) with different resorcinol/phenol (R/P) molar ratios and formaldehyde/(phenol + resorcinol) [F/(P + R)] molar ratios were synthesized through the copolymerization of resorcinol, formaldehyde, and phenol. Phenol−resorcinol−formaldehyde foams (PRFFs) were prepared with synthetic PRFRs. The results showed that PRFR‐2 exhibited higher reactivity, faster curing speed, and better thermal stability. In addition, the foam produced with the PRFR‐2 had improved mechanical and flame retardation properties and a compressive strength of 0.18 MPa, a flexural strength of 0.25 MPa, and a limited oxygen index (LOI) greater than 37%. The increased reactivity of the PRFRs correlated with the changing mechanical properties of PRFFs because of the effects of resorcinol and the molar ratio of formaldehyde to phenol and resorcinol. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44881.

show abstract

Section: Resultsmentioning

confidence: 99%

Resorcinol in high solid phenol−formaldehyde resins for foams production

Liu

Chen

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…For foam materials, the thermal insulating performance plays a very important role in its building applications. 35 Hence, it is indispensable to investigate the thermal conductivity and thermal stability of ZnO/PF/UF nanocomposite foam in this study. Figure 7(a) shows the relationship between the thermal conductivity of ZnO/PF/UF nanocomposite foam with different nano ZnO contents.…”

Section: Thermal Conductivity and Thermal Stability Of Zno/pf/uf Namentioning

confidence: 99%

Preparation and properties of nano ZnO toughed phenol–urea‐formaldehyde foam

Wang

Zheng

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Urea formaldehyde (UF) and phenol formaldehyde (PF) foam possess outstanding flame-retardant properties, excellent insulation, and low thermal conductivity. These properties make them suitable for thermal insulation in buildings. However, the mechanical properties still need to be improved. In this study, orthogonal test was designed to optimize the level components of PF/UF composite foam first, then nano ZnO was added to the PF/UF composite foam to improve its toughness. The effects of nano ZnO on the morphology, apparent density, pulverization rate, thermal conductivity and thermal degradation property, flame retardancy, and mechanical properties of the ZnO/PF/UF nanocomposite foam were studied. The addition of nano ZnO improved the bending and compressive strength and decreased the pulverization rate of the composite foam significantly. The ZnO/PF/UF nanocomposite foam also presented better flame retardant properties than PF/UF composite foam. The largest oxygen index values of ZnO/PF/UF nanocomposite foam could reach 39.31%, while the thermal conductivity and the maximum rate of weight loss temperature were increased to 0.036 W/(mÁK) and 279 C, respectively. Moreover, ZnO/PF/UF nanocomposite foam showed low apparent density property (0.27 g/cm 3). K E Y W O R D S composites, foams, mechanical properties, nanoparticles, thermosets 1 | INTRODUCTION At present, the thermal insulation materials used in building mainly include organic thermal insulation materials and inorganic thermal insulation materials. Organic insulation material (polymer foam material) is a microporous material made from polymer matrix filled with gas, which presents low density, low water absorption, high porosity, and excellent insulation performance. 1-3 Thus, it is widely used in the construction industry owing to excellent flame retardancy, chemical resistance, environmental friendly, thermal insulation, low price, and low water absorption. Urea formaldehyde (UF) foam and phenol formaldehyde (PF) foam has been extensively promoted as the most suitable alternative for thermal insulation building materials. 4-8 However, UF foam lacks active functional groups, thus, it always presents high brittleness, high pulverization ratio, low strength, and toughness. Meanwhile, PF foam also suffers from some mechanical weaknesses. For these reasons, it is necessary to focus on the improvement of PF/UF composite foam mechanical properties, such as, compressive and bending strength, friability and pulverization rate, while still maintaining their excellent flame retardant properties. In general, the toughness of foams can be improved by two methods: the physical method and the chemical

show abstract

“…The reason was that the compatibility between fibers and polymer was greatly improved after treatment, the influence of wood fibers on the foam pore was smaller than that of untreated wood fibers, the cell structure was regular, the size of cell was smaller, and the distribution of pores (Fig. 12) was uniform, so the thermal conductivity of the foam decreased (Ma et al 2013). Figure 12 presents SEM images (×50) of PFCs when the amount of wood fiber was 10%.…”

Section: Thermal Conductivity Of Pfcsmentioning

confidence: 99%

Effects of Fiber Surface Treatments on the Properties of Wood Fiber–Phenolic Foam Composites

Ma¹,

Wang²,

Chu³

2017

BioResources

View full text Add to dashboard Cite

Wood fibers were modified with alkaline solution and silane coupling agent to study changes on the fiber surface and the influence of these treatments on the mechanical properties, flame resistance, thermal conductivity, and microstructure of wood fiber-phenolic foam composites. Test results indicated that the lignin, waxes, hemicelluloses, and other impurities from the fiber surface were partially dissolved and removed. The mechanical properties of treated wood fiber-phenolic foam composites increased dramatically, the cellular pore distribution was more regular, the size of bubble cells was smaller and more uniform, and the thermal conductivity was reduced, and, in particular, the fragility of treated wood fiber-phenolic foam composites decreased. However, with increasing wood fiber content, the mechanical properties and limited oxygen index (LOI) of composite foam decreased. By comprehensive analysis, it was shown that the interfacial compatibility between the fibers and phenolic resin was improved. Nevertheless, the amount of wood used could not be too high, and the optimum amount was approximately 5%.

show abstract

Preparation and Characterization of Melamine Modified Urea-Formaldehyde Foam

Cited by 14 publications

References 29 publications

Resorcinol in high solid phenol−formaldehyde resins for foams production

Resorcinol in high solid phenol−formaldehyde resins for foams production

Preparation and properties of nano ZnO toughed phenol–urea‐formaldehyde foam

Effects of Fiber Surface Treatments on the Properties of Wood Fiber–Phenolic Foam Composites

Contact Info

Product

Resources

About