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Mohd Haziq Dzulkifi,Siti Zaima Zainal,Rohah A. Majid,MOHD YAZID YAHYA 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
Unrecyclable industrial rockwool fiber waste is a worldwide problem that demands an effective yet sustainable solution. This paper presents a work on repurposing industrial rockwool fiber wastes as fillers for rigid polyurethane (PU) foam. The fillers are varied from 1 to 10 wt% and the obtained reinforced foams are characterized for their thermal stability,combustibility, foam morphology, and mechanical response. Marked improvement in thermal stability was observed in thepresence of rockwool inside the foam formulation as denoted by delayed thermal degradation temperatures. Unfortunately,a similar finding was not obtained for its fire-retardancy as no distinguishable differences in Limiting Oxygen Index (LOI)and UL-94 combustion test was observed. Microscopy imaging indicated reduced cell size with increased filler loading,and the rockwool fillers are homogenously scattered within the polymer matrix. Drop in normalized compressive propertieswas detected, suggesting rockwool fillers pose no mechanical reinforcing effect on the foam other than through increasedapparent foam and cellular density.
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Impact resistance efficiency of bio-inspired sandwich beam with different arched core materials
Ahmad B.H. Kueh,Chun-Yean Tan,MOHD YAZID YAHYA,Mat Uzir Wahit 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.1
Impact resistance efficiency of the newly designed sandwich beam with a laterally arched core as bio-inspired by the woodpecker is numerically investigated. The principal components of the beam comprise a dual-core system sandwiched by the top and bottom laminated CFRP skins. Different materials, including hot melt adhesive, high-density polyethylene (HDPE), acrylonitrile butadiene styrene (ABS), epoxy resin (EPON862), aluminum (Al6061), and mild carbon steel (AISI1018), are considered for the side-arched core layer of the beam for impact efficiency assessment. The aluminum honeycomb takes the role of the second core. Contact force, stress, damage formation, and impact energy for beams equipped with different materials are examined. A diversity in performance superiority is noticed in each of these indicators for different core materials. Therefore, for overall performance appraisal, the impact resistance efficiency index, which covers several chief impact performance parameters, of each sandwich beam is computed and compared. The impact resistance efficiency index of the structure equipped with the AISI1018 core is found to be the highest, about 3-10 times greater than other specimens, thus demonstrating its efficacy as the optimal material for the bio-inspired dual-core sandwich beam system.
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SAIFUL IZWAN ABD RAZAK,WAN AIZAN WAN ABDUL RAHMAN,MOHD YAZID YAHYA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
This paper reports the preparation and characterization of nanocomposites consisting of epoxy resin (EP) and conducting polyaniline nanowires doped with formic acid (PANI-FA). The percolation threshold of this nanocomposites was obtained at 8 wt.% of PANI-FA loading. On the other hand, 8 wt.% of PANI-FA resulted in reduction of tensile and °exural modulus up to 30%and 16%, respectively. The fracture morphological analysis revealed a distinct PANI-FA domain on the EP matrix after the percolation threshold has been reached. Using the scaling law of the percolation theory, it was found that the conductivity of the nanocomposites exhibited an exponential factor, (t) of 0.417.
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