Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Tian, Huafeng; Wu, Jiali; Xiang, Aimin

doi:10.1002/vnl.21608

Cited by 39 publications

(40 citation statements)

References 32 publications

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“…When compared with neat PUR_0, the addition of HS fillers results in the production of PUR foams with higher values of T 2% , which refers to the release of volatile products presented in the HS fillers. Previous studies have reported that cellulosic fillers tend to degrade in the range of lower temperatures, thus a higher value of T 2% should be attributed to the partial crosslinking between functional groups of HS fillers and isocyanate groups [ 61 ]. The second degradation of mass loss occurs in the range of 309–326 °C and refers to the thermal decomposition of hard segments—urethane bonds [ 62 , 63 ].…”

Section: Resultsmentioning

confidence: 99%

The Impact of Hemp Shives Impregnated with Selected Plant Oils on Mechanical, Thermal, and Insulating Properties of Polyurethane Composite Foams

2020

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Polyurethane (PUR) foams reinforced with 2 wt.% hemp shives (HS) fillers were successfully synthesized. Three different types of HS fillers were evaluated—non-treated HS, HS impregnated with sunflower oil (SO) and HS impregnated with tung oil (TO). The impact of each type of HS fillers on cellular morphology, mechanical performances, thermal stability, and flame retardancy was evaluated. It has been shown that the addition of HS fillers improved the mechanical characteristics of PUR foams. Among all modified series, the greatest improvement was observed after the incorporation of non-treated HS filler—when compared with neat foams, the value of compressive strength increased by ~13%. Moreover, the incorporation of impregnated HS fillers resulted in the improvement of thermal stability and flame retardancy of PUR foams. For example, the addition of both types of impregnated HS fillers significantly decreased the value of heat peak release (pHRR), total smoke release (TSR), and limiting oxygen index (LOI). Moreover, the PUR foams containing impregnated fillers were characterized by improved hydrophobicity and limited water uptake. The obtained results confirmed that the modification of PUR foams with non-treated and impregnated HS fillers may be a successful approach in producing polymeric composites with improved properties.

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Section: Resultsmentioning

confidence: 99%

The Impact of Hemp Shives Impregnated with Selected Plant Oils on Mechanical, Thermal, and Insulating Properties of Polyurethane Composite Foams

2020

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“…This indicates that the release of volatile products from the polyurethane matrix increases with the addition of the fibers [93]. Taking this into account, the volatile products of biodegradable fibers tend to release at lower temperatures, the higher values of T2% may be connected with partial crosslinking between filler's functional groups and isocyanate groups (-NCO) [94]. This effect is more prominent for foams modified with chemically-treated fibers.…”

Section: Thermogravimetric Analysis Of Polyurethane Foamsmentioning

confidence: 98%

“…Additionally, chemically-treated fibers can act as a cross-linker between PUR backbones, consequently enhancing the thermal properties of the foam. Tian et al [94] reported that the enhancement of thermal stability of the soy-protein enhanced foams is may be attributed to the crosslinking effect of soy protein on the matrix, which prevents the volatile products generated during thermal decomposition, leading to the retardance of the thermal degradation action. A similar effect can be found in the presented work.…”

Section: Flammability Of Polyurethane Foamsmentioning

confidence: 99%

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

et al. 2020

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In this work, rigid polyurethane (PUR) foams were prepared by incorporating 2 wt% of eucalyptus fibers. The eucalyptus fibers were surface-modified by maleic anhydride, alkali, and silane (triphenylsilanol) treatment. The impact of the modified eucalyptus fibers on the mechanical, thermal, and fire performances of polyurethane foams was analyzed. It was observed that the addition of eucalyptus fibers showed improved mechanical and thermal properties and the best properties were shown by silane-treated fibers with a compressive strength of 312 kPa and a flexural strength of 432 kPa. Moreover, the thermal stability values showed the lowest decline for polyurethane foams modified with the silane-treated fibers, due to the better thermal stability of such modified fibers. Furthermore, the flame resistance of polyurethane foams modified with the silane-treated fibers was also the best among the studied composites. A cone calorimetry test showed a decrease in the peak of heat release from 245 to 110 kW∙m−2 by the incorporation of silane-treated fibers. Furthermore, total heat release and total smoke release were also found to decrease remarkably upon the incorporation of silane-treated fibers. The value of limiting oxygen index was increased from 20.2% to 22.1%. Char residue was also found to be increased from 24.4% to 28.3%. It can be concluded that the application of chemically modified eucalyptus fibers has great potential as an additive to incorporate good mechanical, thermal, and fire properties in rigid polyurethane foams.

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“…Soy protein isolate (SPI) is one kind of plant protein with high quality and low cost . In addition to food application areas, soy protein based biomaterials are attracting more and more attention for their eco‐friendly characters . Pure soy protein possesses poor thermoplasticity due to the abundant hydrogen bonding interactions .…”

Section: Introductionmentioning

confidence: 99%

Nanoclay incorporation into soy protein/polyvinyl alcohol blends to enhance the mechanical and barrier properties

Guo

Tian

2019

Polymer Composites

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To enhance the mechanical and water barrier properties of soy protein isolate (SPI/)/polyvinyl alcohol (PVA) blends, montmorillonite (MMT), as a layered silicate clay was incorporated and SPI/PVA/MMT composite films were successfully prepared by melt processing in this work. The results showed that the structure of the composites was highly dependent on the MMT content. MMT nanofillers could act as the heterogeneous nucleating agent for PVA, which accelerated the crystallization and increased the size distribution of the crystalline. With the increase of MMT content, the tensile strength and Young's modulus of the composites increased, exhibiting the fine reinforcing effect. Due to the effective restriction of the highly disordered MMT lamellae on the matrix segment, the water sensitivity of the composites decreased and at the same time, the thermal stability improved. The resulting nanocomposite films exhibited wide applications as biodegradable materials, green packaging films, etc. POLYM. COMPOS., 40:3768-3776, 2019. POLYMER COMPOSITES-2019 FIG. 8. The TGA (a) and DTG (b) curves of SPI/PVA/MMT composite films. [Color figure can be viewed at wileyonlinelibrary.com]

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Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Cited by 39 publications

References 32 publications

The Impact of Hemp Shives Impregnated with Selected Plant Oils on Mechanical, Thermal, and Insulating Properties of Polyurethane Composite Foams

The Impact of Hemp Shives Impregnated with Selected Plant Oils on Mechanical, Thermal, and Insulating Properties of Polyurethane Composite Foams

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

Nanoclay incorporation into soy protein/polyvinyl alcohol blends to enhance the mechanical and barrier properties

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