Agito, Rafael S.  <br/><br/>
Property characterization of composite board utilizing coconut shell particles and coconut coir bonded with vinyl ester resin/  
Rafael S. Agito, John Roque M. Angon, Christopher Avenda, Angelica E. Faller, John Daryll T. Lente, Kristine Jewel D. Nepales, and Aljohn G. Quilicol .-- 
 - Manila:   Technological University of the Philippines,   2023. 
 - xii, 142pages:   29cm.   +1 CD-ROM (4 3/4in.)  
<br/><br/> Thesis (undergraduate)  
<br/><br/>College of Engineering.-- 
<br/><br/>Includes bibliography:  
<br/><br/> The study utilized coconut waste products, specifically coir and shell, as<br/>reinforcement for composite board bonded with vinyl ester resin. Coconut coir was<br/>extracted from the coconut husk, cleaned, cut into 3 cm length fibers, and treated with<br/>NaOH for 72 hours. As for the filler material, coconut shells were crushed, sieved through<br/>a 100-mesh size, and treated with NaOH for 2 hours.<br/>Eight (8) design mixes were prepared. The composite boards were fabricated using<br/>hand lay-up method, and the boards were evaluated in accordance to ASTM D1037 and<br/>Philippine National Standards (PNS). Samples were tested for water absorption, thickness<br/>swelling, modulus of rupture, and nail head pull through.<br/>The treated coconut coir indicates a tensile strength of 9.28 Kgf/g.m and an<br/>elongation of 31.76%. On the other hand, the chemical properties of the coconut shell<br/>particles were found to have less potential to absorb the moisture from surrounding due to<br/>its morphological aspects. Regarding the physical properties of the composite board, all<br/>design mixes passed the PNS. Design mix A had the lowest water absorption at 1.24%, and<br/>design mix F had the lowest thickness swelling with 0.27%. For the mechanical properties<br/>of the composite board, all boards passed the PNS. For the modulus of rupture, all eight<br/>design mixes can be classified as Type 100, while design mixes E, F, G and H containing<br/>15% coconut coir can be classified as Type 150, as well. Only design mix E and G can be<br/>classified as Type 200. Moreover, for the nail head pull through design mix G had the<br/>highest mean value of 414.62 kg. Analysis of all test results revealed that Design Mix G<br/>with 20 CSP: 15CF: 65VE is the optimum ratio. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coconut waste <br/>Vinyl ester resin 
<br/><br/><label>LC Class. No.: </label>BTH TA 145  / A35 2023