Water absorption, thickness swelling and thermal properties of roselle/sugar palm fibre reinforced thermoplastic polyurethane hybrid composites

Radzi, A.M.; Sapuan, S. M.; Mansor, Muhd Ridzuan

doi:10.1016/j.jmrt.2019.07.007

Cited by 89 publications

(41 citation statements)

References 31 publications

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“…With an increase in the product density from 30 to 40 kg/m 3 , the average content of closed cells is reduced by 4.5%, while the short-term water absorption and water vapor resistance factor increase by 38% and 118%, respectively. Additionally, the difference in the percentage of closed cell contents may be the key factor for increased water absorption and water vapor resistance factors, as it has been shown in a few studies [48,49]. However, the obtained results are in excellent agreement with those for similar products existing on the market.…”

Section: Moisture Properties Of the Stable Productssupporting

confidence: 73%

Closed Cell Rigid Polyurethane Foams Based on Low Functionality Polyols: Research of Dimensional Stability and Standardised Performance Properties

et al. 2020

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Currently, polyurethane foam producers come across the several problems when petroleum-based polyols are replaced with low functionality biomass, or waste-based, polyols. In addition, the dilemma is intensified with regulations that require full or partial replacement of blowing agents that can cause high ozone depletion with alternatives like water, which causes the formation of CO2. Therefore, these gases diffuse out of the foam so quickly that the polymeric cell walls cannot withstand the pressure, consequently causing huge dimensional changes at ambient temperature and humidity. Even though the theoretical stoichiometric balance is correct, the reality shows that it is not enough. Therefore, polyethylene terephthalate waste-based polyol was chosen as a low functionality polyol which was modified with high functionality sucrose-based polyol in order to obtain dimensionally stable polyurethane foams in the density range of 30–40 kg/m3. These more stable foams are characterized by linear changes no higher than 0.5%, short-term water absorption by partial immersion no higher than 0.35 kg/m2, and water vapor resistance factors up to 50. In order to obtain thermally efficient polyurethane foams, conventional blowing agents and water systems were implemented, thus, assuring thermal conductivity values in the range of 0.0198–0.0204 W/(m·K) and obtaining products which conform to all the requirements for performance of sprayed and factory-made polyurethane foam standards EN 14315-1 and EN 13165.

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Section: Moisture Properties Of the Stable Productssupporting

confidence: 73%

Closed Cell Rigid Polyurethane Foams Based on Low Functionality Polyols: Research of Dimensional Stability and Standardised Performance Properties

et al. 2020

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“…Higher weight gains due to the moisture absorption for the hybrid composites compared to the composites without hybridization or pure fibre reinforced composites were reported in the literature. The weight gains due to water absorption increased in the order: pure sugar palm fibre composite < roselle/sugar palm-based hybrid composite [40] and pure sugar palm/thermoplastic sugar palm starch agar matrix composites < seaweed/sugar palm fibre hybrid [41]. In an attempt to examine the effects of moisture diffusion on the thickness of the composite specimens, thickness swelling test was conducted.…”

Section: Water Absorptionmentioning

confidence: 99%

Investigation into mechanical, absorption and swelling behaviour of hemp/sisal fibre reinforced bioepoxy hybrid composites: Effects of stacking sequences

Thiagamani

Krishnasamy

Muthukumar

et al. 2019

International Journal of Biological Macromolecules

123

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…It can be seen that, the percentage of water absorption of the sample increased with the increasing of OPMF content in each sample due to the tendency of OPMF to absorb water as a result of the existence of hydroxyl groups. Hydroxyl groups can form hydrogen bonding with water, which enhance the affinity toward water, and allowing water molecules to be absorbed [17,18]. Figure 4 shows the DSC curve of heat flux versus temperature for the samples at different loading of OPMF.…”

Section: Water Absorptionmentioning

confidence: 99%

Development of bio-composite film based on high density polyethylene and oil palm mesocarp fibre

Laftah¹,

Majid

2019

SN Appl. Sci.

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The aim of this study is to develop bio-film based on high-density polyethylene (HDPE) and oil palm mesocarp fibre (OPMF). Rheological and mechanical properties of the biofilm were investigated using melt flow index and tensile test respectively. The produced films were characterized using scanning electron microscopy and differential scanning calorimetry (DSC). In addition, biodegradation and absorption properties were studied. OPMF is dried and then added to HDPE to be compounded using a twin-screw extruder. Maleic anhydride was used as compatibilizer during the melt mixing. The film samples were prepared using hot compression moulding process. Young's modulus was found to increase with addition of OPMF and vice versa for tensile strength and elongation at break of the film sample. The reason behind the reduction of tensile strength and elongation at break is the low effective cross sectional area of HDPE matrix. Melting point value was increased after the addition of OPMF into the film as shown in DSC analysis. The rising of water absorption rate of the films is greatly relative to the content of OPMF as a result of high affinity of OPMF to water.

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Water absorption, thickness swelling and thermal properties of roselle/sugar palm fibre reinforced thermoplastic polyurethane hybrid composites

Cited by 89 publications

References 31 publications

Closed Cell Rigid Polyurethane Foams Based on Low Functionality Polyols: Research of Dimensional Stability and Standardised Performance Properties

Closed Cell Rigid Polyurethane Foams Based on Low Functionality Polyols: Research of Dimensional Stability and Standardised Performance Properties

Investigation into mechanical, absorption and swelling behaviour of hemp/sisal fibre reinforced bioepoxy hybrid composites: Effects of stacking sequences

Development of bio-composite film based on high density polyethylene and oil palm mesocarp fibre

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