Impact of water saturation on the tensile and thermal properties of heat-treated mangrove/high-density polyethylene composites

Adebayo, Ganiyat Olusola and Hassan, Aziz and Yahya, Rosiyah and Muhamad Sarih, Norazilawati and Odesanya, Kazeem Olabisi (2021) Impact of water saturation on the tensile and thermal properties of heat-treated mangrove/high-density polyethylene composites. Journal of Thermoplastic Composite Materials, 34 (4). pp. 508-522. ISSN 0892-7057, DOI

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The main barrier in the use of natural fiber (NF) as a reinforcing material in thermoplastic composites meant for outdoor applications is NF's hydrophilicity. Thus, heat treatment of vacuum-dried mangrove was conducted at 120 degrees C in order to reduce the hydrophilic nature of mangrove. The untreated and heat-treated mangrove particles were compounded with high-density polyethylene (HDPE) at 10, 20, and 30 wt% in a twin-screw extruder and injection molded into dog-bone-shaped test pieces for tensile tests and thermal analysis (thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC)). Test pieces were immersed in distilled water for 1440 h at ambient temperature (approximately 27 degrees C) and a relative humidity of 60-65%. The results revealed that the earliest and latest water saturation were observed at 480 and 792 h for 10 wt% treated and 30 wt% untreated composites, respectively. The dry composites maintained higher tensile strength and modulus but lower tensile strain than the water-saturated composites irrespective of treatment. Scanning electron microscopy of tensile fractured surfaces confirmed an improved mangrove-HDPE interfacial interaction of treated composites in both dry and water-saturated conditions. The TGA and DSC data showed that the maximum degradation temperature of dry composites is higher than the wet composites. Overall, the treated composites at dry and water-saturated conditions indicated better tensile and thermal stability than the untreated mangrove-filled HDPE composites; these are possible indications of better performance during outdoor applications.

Item Type: Article
Uncontrolled Keywords: Mangrove plastic composite; Heat treatment; Crystallinity; Thermogravimetric analysis; Moisture absorption; Interfacial adhesion; Morphology
Subjects: Q Science > QD Chemistry
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering > Department of Mechanical Engineering
Faculty of Science > Department of Chemistry
Depositing User: Ms Zaharah Ramly
Date Deposited: 15 Jun 2022 05:04
Last Modified: 15 Jun 2022 05:04

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