Effect of methylene diphenyl diisocyanate index on physicomechanical and morphological properties of palm olein-based viscoelastic polyurethane foams

Nurul ‘Ain Hanzah and Kosheela Devi Poo Palam and Tuan Noor Maznee Tuan Ismail and Srihanum Adnan and Norhayati Mohd Noor and Mohd Norhisham Sattar and Yeong, Shoot Kian (2022) Effect of methylene diphenyl diisocyanate index on physicomechanical and morphological properties of palm olein-based viscoelastic polyurethane foams. Journal of Oil Palm Research (Malaysia), 35. pp. 236-246. ISSN 2811-4701

This study revealed the behaviour of the effect of varying the methylene diphenyl diisocyanate (MDI) index on foaming reactivity, physico-mechanical and morphological properties of palm olein-based viscoelastic polyurethane (VE-PU) foams. The palm olein-based polyol, E-135 NOP was used from 15% to 25% (w/w) in the VE-PU foam formulations. Our study revealed that by varying the isocyanate indices, no significant changes in cream and gelling times were observed, but the rise time was slightly decreased, indicating that the rate of reaction had increased. The compression force deflection (CFD) and tensile strength with palm oleinbased VE-PU foam with 25% of E-135 NOP were significantly increased as the isocyanate indices increased. However, it was observed that other mechanical properties, i.e., density and resiliency of palm olein-based VE-PU foam decreased as the isocyanate indices increased. In terms of morphology, the average cell size determined by scanning electron microscope (SEM) also increased as the isocyanate indices increased. The finding of this study could have practical significance in the selection of the optimal isocyanate index to formulate VE-PU products.

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Abstract

This study revealed the behaviour of the effect of varying the methylene diphenyl diisocyanate (MDI) index on foaming reactivity, physico-mechanical and morphological properties of palm olein-based viscoelastic polyurethane (VE-PU) foams. The palm olein-based polyol, E-135 NOP was used from 15% to 25% (w/w) in the VE-PU foam formulations. Our study revealed that by varying the isocyanate indices, no significant changes in cream and gelling times were observed, but the rise time was slightly decreased, indicating that the rate of reaction had increased. The compression force deflection (CFD) and tensile strength with palm oleinbased VE-PU foam with 25% of E-135 NOP were significantly increased as the isocyanate indices increased. However, it was observed that other mechanical properties, i.e., density and resiliency of palm olein-based VE-PU foam decreased as the isocyanate indices increased. In terms of morphology, the average cell size determined by scanning electron microscope (SEM) also increased as the isocyanate indices increased. The finding of this study could have practical significance in the selection of the optimal isocyanate index to formulate VE-PU products.

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Item Type:	Article
AGROVOC Term:	polyurethane
AGROVOC Term:	viscoelasticity
AGROVOC Term:	morphology
AGROVOC Term:	sampling
AGROVOC Term:	foaming
AGROVOC Term:	palm oils
AGROVOC Term:	reaction chemistry
AGROVOC Term:	mechanical properties
Geographical Term:	Malaysia
Depositing User:	Nor Hasnita Abdul Samat
Date Deposited:	28 Aug 2024 07:31
Last Modified:	28 Aug 2024 07:31
URI:	http://webagris.upm.edu.my/id/eprint/972

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