SYNTHESIS AND CHARACTERIZATIONS OF ADHESIVE MATERIALS MADE OF STARCH-G-POLY(POTASSIUM 3-SULFOPROPYL METHACRYLATE) AND POLYVINYL ALCOHOL CROSSLINKED BY SODIUM TRIMETAPHOSPHATE

• Main Author: Aulia Putri, Kharisma
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/82947
• Institution: Institut Teknologi Bandung

The demand for wood adhesives continues to increase over time as they play an essential role in the wood construction industry. However, commercial wood adhesives in the industry are generally based on non-renewable petrochemical compounds, such as urea-formaldehyde and melamine-formaldehyde. These compounds can release pollutants that are harmful to humans by increasing the risk of cancer. Therefore, there is a need for alternative adhesive materials based on renewable materials that are safe for living beings and the environment. Starch is one of the renewable anf cost-effective alternatives for adhesive materials. In this research, starch was isolated from cassava and then modified through graft copolymerization using acrylatederivative compound, potassium 3-sulfopropyl methacrylate as monomer, to enhance its characteristics. The resulting copolymer was starch-g-poly(potassium 3-sulfopropyl methacrylate), which was then cross-linked with polyvinyl alcohol (PVA) using sodium trimetaphosphate to enhance the mechanical properties of the starch adhesive. The graft copolymerization results showed a higher percentage of grafting when the amount of initiator was 40% (w/w to starch) with the microwave heating method. Starch-g-poly(potassium 3 sulfopropyl methacrylate) cross-linked with PVA was characterized using FTIR and exhibited characteristic absorption bands at wave numbers 1137 cm?1 from the C?O group, 1750 cm?1 from the C=O group, and a broad absorption from -OH at wave numbers 3000?3700 cm?1. Additionally, the viscosity of the starch-g-poly(potassium 3-sulfopropyl methacrylate) cross linked with PVA (PKSM-PVA) solution increased with the increasing amount of cross-linking agent. Shear strength tests on multiplex materials bonded with PKSM-PVA with a bonding area of 4 cm x 6 cm required a load of 525,8 N to separate the bonded results. The data showed that the higher the amount of PVA cross-linked with starch, the higher the adhesive strength. These data indicate that the synthesized product in this study has potential as an adhesive material.