The Mechanical Properties of Medium Density Rigid Polyurethane Biofoam

Ali, Ernie Suzana; Zubir, Syazana Ahmad

doi:10.1051/matecconf/20163901009

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…The mechanical properties of foams are affected by many factors, including foam density, types of polyols and isocyanate used, ratio of -NCO/-OH, etc. [45][46][47][48]. In this study, the type of polyols and isocyanate was the same for all groups.…”

Section: Mechanical Properties Of Pufmentioning

confidence: 99%

Thermal Insulating and Mechanical Properties of Cellulose Nanofibrils Modified Polyurethane Foam Composite as Structural Insulated Material

Leng

Biao

2019

Forests

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Cellulose nanofibrils (CNF) modified polyurethane foam (PUF) has great potential as a structural insulated material in wood construction industry. In this study, PUF modified with spray-dried CNF was fabricated and the physical and mechanical performance were studied. Results showed that CNF had an impact on the foam microstructure by increasing the precursor viscosity and imposing resistant strength upon foaming. In addition, the intrinsic high mechanical strength of CNF imparted an extra resistant force against cells expansion during the foaming process and formed smaller cells which reduced the chance of creating defective cells. The mechanical performance of the foam composite was significantly improved by introducing CNF into the PUF matrix. Compared with the PUF control, the specific bending strength, specific tensile strength, and specific compression strength increased up to three-fold for the CNF modified PUF. The thermal conductivity of PUF composite was mainly influenced by the closed cell size. The introduction of CNF improved thermal insulating performance, with a decreased thermal conductivity from 0.0439 W/mK to 0.02724 W/mK.

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Section: Mechanical Properties Of Pufmentioning

confidence: 99%

Thermal Insulating and Mechanical Properties of Cellulose Nanofibrils Modified Polyurethane Foam Composite as Structural Insulated Material

Leng

Biao

2019

Forests

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“…Then, isocyanate was added into the mixture and stirred at 3000 rpm for 20 seconds [9]. After that, the mixture was poured in an acrylic mould and conditioned at room temperature for about 24 hours for curing and hardening [12]. The sample was demoulded and left conditioned at room temperature for about 36 hours before going for testing and analysis.…”

Section: Preparation Of Cpug and Ppug Foamsmentioning

confidence: 99%

Mechanical Properties of Green and Petroleum based Polyurethane as Grouting Materials

Hussain¹,

Bonnia²,

Asli³

et al. 2022

JMechE

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In this study, polyurethane grouting materials (PUG) were prepared using two different types of polyol which were castor-based polyol (CPUG) and petrochemical-based polyol (PPUG). Four different ratios of polyol (OH) to isocyanate (NCO) were used in this study. The effect of different compositions of Isocyanate on mechanical properties were investigated and compared. The flexural strength, and compression strength shows the increment with the increase of the NCO composition. Optimum flexural strength, flexural modulus, and compression strength obtained at composition of PPUG4 and CPUG4 with the ratio of NCO: OH, 2.6: 1. PPUG gives a higher value of mechanical strength as compared to CPUG, however, results obtained for both types of polyurethane are in the range of industrial PU grouting properties grade. The decrease in cell wall of CPUG and PPUG with the increase of NCO:OH indicating the increment in cell wall interaction resulting higher mechanical properties of PUG.

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“…Then, isocyanate was added into the mixture and mixed at 3000 rpm for about 20 seconds. After that, the mixture was poured and moulded in acrylic mould and conditioned at room temperature for about 24 hours to allow the curing and hardening of CPUC [13]. CPUC was demoulded and conditioned at room temperature for about 36 hours before being tested to enable CPUC to be fully cured.…”

Section: Preparation Of Cpucmentioning

confidence: 99%

Preparation of Castor-Based Polyurethane Composites Filled With Waste Carbon Tyres (Wct) as Grouting Material

et al. 2020

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This research focused on the fabrication of castor-based polyurethane composite (CPUC) filled with waste carbon tyres (WCT) with particle size of 200 µm that acts as reinforcing filler. WCT was first sieved using a sieving machine to obtain uniform particle size. WCT loading was varied at 0wt%, 2wt%, 4wt% and 6wt%. The effect of WCT loading in CPUC was evaluated based on their foam reaction time, apparent density, rheology, compression strength, morphology and thermal properties. The foam reaction time of CPUC achieved was in the range of industrial PU grout’s properties. The rheology index and compression strength of CPUC decreased with increasing WCT loading. CPUC with 2wt% of WCT loading achieved the optimum compression strength where it increased from 2.58 MPa to 3.39 MPa with the improvement of 31.40% compared to neat PU. FESEM micrograph showed that CPUC consists of closed foam cell indicating the rigidity of the CPUC. The addition of 2wt% of WCT resulted in achieving the optimum thermal stability of CPUC where CPUC2 had the highest char residue content. The high residue content indicated that CPUC2 had the lowest decomposition of elements as WCT acted as heat barrier in CPUC matrix thus increasing the thermal stability of CPUC2.

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The Mechanical Properties of Medium Density Rigid Polyurethane Biofoam

Cited by 5 publications

References 7 publications

Thermal Insulating and Mechanical Properties of Cellulose Nanofibrils Modified Polyurethane Foam Composite as Structural Insulated Material

Thermal Insulating and Mechanical Properties of Cellulose Nanofibrils Modified Polyurethane Foam Composite as Structural Insulated Material

Mechanical Properties of Green and Petroleum based Polyurethane as Grouting Materials

Preparation of Castor-Based Polyurethane Composites Filled With Waste Carbon Tyres (Wct) as Grouting Material

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