Plastik ramah lingkungan umumnya digunakan untuk aplikasi kemasan sekali pakai, salah satunya adalah penggunaan singkong sebagai bahan plastik biodegradable. Proses pencampuran biodegradable selama pendinginan umumnya menggunakan air, sementara itu pati memiliki sifat mudah menyerap air sehingga memungkinkan terbentuknya porositas pada produk akhir. Pada kegiatan ini dilakukan pembuatan komposit HDPE biodegradable – pati singkong dengan parameter penambahan pati dan proses pendinginan setelah compounding,pengamatan dilakukan melalui struktur morfologi. Parameter proses pendinginan setelah compounding yaitu dengan cara memasukkan sampel ke dalam air selama beberapa menit dan dengan pendinginan udara. Karakterisasi awal dilakukan dengan pengukuran MFR (Melt Flow Rate) dan strain at break. Dari hasil pengujian, campuran biodegradabledengan 10% pati menghasilkan nilai MFR 0,258 g/10 menit dan strain at break 10,37%, nilai ini menunjukan karakteristik material polimer untuk proses injection molding. Selanjutnya material setelah proses pendinginan diamati porositas menggunakan alat SEM (Scanning Electron Microscope), porositas terbentuk karena sifat pati yang menyerap air. Hasil morfologi alat SEM menunjukkan adanya porositas dalam produk yang dilakukan proses pendinginan menggunakan air. Pendinganan lebih lama menghasilkan porositas sekitar 5,32 μsedangkan pendinginan lebih lambat menghasilkan porositas sekitar 2,48 μ. Hal ini dapat disimpulkan bahwa semakin lama proses pendinginan, maka semakin besar porositas yang terbentuk. Sementara proses pendinginan dengan udara tidak membentuk porositas pada komposit HDPE biodegradable – pati singkong.Â
Glass fiber reinforced unsaturated polyesters were prepared by hand lay-up technique. Effect of clay conditions and loading, as well as mixing time on tensile modulus, flammability, and wear resistance were evaluated. In general, the results showed that there might be two possible structures, dispersed and agglomerated, in the composite samples. The modulus results showed that the effect of clay drying, as well as higher filler loading increase the property. In contrast, the mixing time resulted in negative effect on modulus. The improvement on modulus and flammability might be influenced by clay dispersion due to shear and viscosity change, while the decrease on modulus and wear resistance might be caused by agglomerated structures due to lubrication effect of moisture content, and less crosslink point caused by styrene evaporation.
In this research, composite material was fabricated from both renewable resources and biodegradable materials: ramie woven fabric as reinforcement and 3D printed polylactic acid (PLA) filament as resin matrix. The laminate composites were produced using a film stacking method and processed using hot-press molding. The mechanical properties of woven ramie fabric, PLA matrix, and laminate composites were investigated. It is shown that the breaking force of the plain woven ramie fabric in the warp direction was greater than in the weft direction. Further, the tensile and impact properties of laminate at warp direction higher than weft direction when ramie fabric reinforcement is used. In addition, scanning electron microscopy examination of laminate composite showed good bonding between ramie fiber and PLA matrix. In summary, laminated composites based on polylactic acid and woven ramie fabric display good performance capability, which can use for the development of engineering applications.
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