Evaluation of rubber powder waste as reinforcement of the polyurethane derived from castor oil

Silva, Nycolle G. S.; Cortat, Lucas I.C.O.; Orlando, Diego; Mulinari, Daniella Regina

doi:10.1016/j.wasman.2020.07.032

Cited by 50 publications

(30 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This indicates that the application of up to 0.70 PURb/WS enhances the formation of smaller cells due to the existence of small particles in the WS filler. It is known that the addition of filler may change the nucleation mode from homogeneous to heterogeneous, and reduce the nucleation energy, thus promoting the formation of a higher number of smaller cells [51,52]. This phenomenon can be observed for the PUR biocomposite foams with a 0.70 PURb/WS ratio (Figure 6c).…”

Section: Apparent Density Thermal Conductivity and Microstructure Of Ws-filled Pur Biocomposite Foamsmentioning

confidence: 77%

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

View full text Add to dashboard Cite

Currently, the recycling potential of wood waste (WW) is still limited, and in a resource efficiency approach, recycling WW in insulation materials, such as polyurethane (PUR), appears as an appropriate solution. It is known that the quality of WW is the main aspect which influences the stability of the final products. Therefore, the current study analyses different WW-based fillers as possible modifiers for polyurethane biocomposite foams for the application as loose-fill materials in building envelopes. During the study of WW-based fillers, it was determined that the most promising filler is wood scobs (WS) with a thermal conductivity of 0.0496 W/m·K, short-term water absorption by partial immersion—12.5 kg/m2, water vapour resistance—0.34 m2·h·Pa/mg and water vapour diffusion resistance factor—2.4. In order to evaluate the WS performance as a filler in PUR biocomposite foams, different ratios of PUR binder and WS filler (PURb/WS) were selected. It was found that a 0.40 PURb/WS ratio is insufficient for the appropriate wetting of WS filler while a 0.70 PURb/WS ratio produced PUR biocomposite foams with the most suitable performance: thermal conductivity reduced from 0.0523 to 0.0476 W/m·K, water absorption—from 5.6 to 1.3 kg/m2, while the compressive strength increased from 142 to 272 kPa and the tensile strength increased from 44 to 272 kPa.

show abstract

Section: Apparent Density Thermal Conductivity and Microstructure Of Ws-filled Pur Biocomposite Foamsmentioning

confidence: 77%

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In addition to the main events, a small perturbation of the thermograms near 100°C was also seen due to moisture content 75 . A small event near all samples 450°C can also correspond to PU degradation, 76 more specifically the degradation of the ether bonds of the polyol 75 …”

Section: Resultsmentioning

confidence: 92%

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

Maia

Zanini

Claro

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this article, a new approach is applied to reuse Artemisia residue (AR) as filler in polyurethane (PU) foam for vegetable oil sorption for discarded cooking oil applications. The pristine PU and PU/X%AR foams (X stands for AR content of 5–20%wt/wt) were characterized by SEM, density, contact angle (CA), thermogravimetric analysis, and Fourier transform infrared spectroscopy. The influence of two experimental factors, such as contact time (30–180 s) and initial vegetable oil concentration (20–200 g/L), was investigated in vegetable oil and vegetable oil/mineral water systems. The AR loading of the foams increased the foams' density and influenced the morphological, physical, thermal, and sorption properties. The PU/20%AR sample presented the highest CA (122.5°) and the best sorption capacity and efficiency in both systems due to the small pores size and higher frequency of pores. Langmuir and Freundlich isotherm models well defined the sorption mechanisms. The Langmuir model represented the best fit of experimental data for PU/20%AR with a maximum adsorption capacity of 16.86 g/g. The PU/20%AR presented reusability of 7 cycles, conserving their hydrophobicity after the process. Therefore, AR is an innovative route as fillers in PU foams for discarded vegetable oil sorption, and the circular economy can benefit from the reuse of discarded vegetable cooking oil.

show abstract

“…Also, the theoretical weight loss (%) was calculated at 450* C by a simple rule of the mixture to analyze chemical interactions that could improve thermal stability. 58 Regarding the results, LDPE/MN5% showed higher theoretical weight loss than experimental results, that is, some chemical interactions between matrix/filler could improve the thermal stability. Additionally, it was estimated the heat resistance index, Table 4, proposed by Icduygu et al 39 and Tang et al 59 These values correspond to the resistance heat capacity of a material exposed to constant heat flow.…”

Section: Thermal Propertiesmentioning

confidence: 82%

“…Also, the theoretical weight loss (%) was calculated at 450*°C by a simple rule of the mixture to analyze chemical interactions that could improve thermal stability 58 . Regarding the results, LDPE/MN5% showed higher theoretical weight loss than experimental results, that is, some chemical interactions between matrix/filler could improve the thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Approach in Macadamia integrifolia residue based low‐density polyethylene composites on mechanical and thermal performance

Andrade

Silva

Cortat

et al. 2021

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Macadamia nutshell residues are generated in large quantities, around 70%-77% for each ton produced, and it is a waste material with high technoeconomic potential. This work purpose a sustainable alternative to valorize macadamia nutshell residues (MN) as reinforcing in low-density polyethylene (LDPE) composites through melt mixing, using different fiber contents (0, 5, 10, and 20 wt%), and investigate the influence of fibers (residues) in composites by mechanical tests and thermal analysis. The fibers addition has significantly increased the composites' stiffness compared with neat LDPE, causing a reduction of toughness and resilience, leading to lower impact energy absorption. The LPDE/MN20% composite obtained the best tensile and flexural mechanical performance, resulting in a maximum modulus, which implies an increase of 36.9% and 77.6% compared with the neat LDPE. The addition of macadamia fibers on the composites acted as nucleation points of spherulites, which promoted an increase in the crystallization degree. Consequently, better performance of mechanical properties was observed in the green composites. Thus, the macadamia nutshell residues present a promising future as filler in LDPE for enhancing composites' thermal and mechanical properties. K E Y W O R D S biopolymers, mechanical properties, renewable polymers, thermal properties, thermoplastics 1 | INTRODUCTION Nutshells are often utilized in a relatively low-value application, such as, composts, mulches, fertilizers, and animal feed. 1 The unit operations involved in the separation of nut kernel from other nut parts can vary depending on the nut type. Still, there are common steps, such as, drying, extraction of the components, shelling, and separation process, giving the nut kernels and dry nutshell. 2 The agroindustrial crop's valorization is interesting for synthetic chemistry, perfumery, cosmetics, biomedicine, and energy industries. Some studies reported techno-economic valorization of nutshells residues, such as, macadamia, 3-9 pistachio, 10,11 pecan, 12-17 almond, 18 cashew, 19-21 cedar, 22 oak, 23 fox 24 for catalytic pyrolysis, wastewater treatment, bio-fillers in a polymeric matrix, microporous sorbents, preparation of carbonbased products, biochar, supercapacitor for powering electronic devices. Among the agroindustrial nutshell waste, macadamia nutshells are highlighted. Around 44,000 metric tons (kernel) are produced worldwide, 25,26 which generates

show abstract

Evaluation of rubber powder waste as reinforcement of the polyurethane derived from castor oil

Cited by 50 publications

References 44 publications

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

Approach in Macadamia integrifolia residue based low‐density polyethylene composites on mechanical and thermal performance

Contact Info

Product

Resources

About