Teknologi modern pada bahan konstruksi pesawat terbang dituntut untuk dapat menemukan bahan-bahan yang ringan namun memiliki daya tahan (kekuatan) yang besar. Bahan dengan karakter seperti ini sangat banyak gunanya, terutama dimanfaatkan sebagai bahan utama untuk badan pesawat terbang. Saat ini, pesawat-pesawat terbaru menggunakan bahan komposit sebagai komponen utama badan pesawat. Penelitian pembuatan komposit resin polyester berpenguat serat sabut kelapa bertujuan untuk mengetahui pengaruh penambahan serat sabut kelapa terhadap nilai energi impact yang diserap rata-rata dari setiap variasi fraksi berat serat 0%, 1%, 2%, 3%, 4% dengan matrik resin polyester 200 ml. Dari hasil pengujian impact metode charphy dengan standard ASTM E-23 didapatkan nilai energi yang diserap rata-rata tertinggi terjadi pada penambahan fraksi berat serat 4% sebesar 338,6 Joule. Hal ini menunjukkan bahwa semakin banyak penambahan fraksi berat serat sabut kelapa, maka energi yang diserap pada pengujian impact akan semakin besar karena ikatan antara matriks dan serat sabut kelapa dapat menjadikan material komposit menjadi tahan akan benturan jika dikenai beban. Dan untuk hasil mode patahan pada fraksi berat serat 0% yang terlihat adalah mode patahan matrix rich. Sedangkan untuk fraksi berat serat 1-4% mode patahan yang terlihat adalah pullout dan overload.Kata Kunci: Komposit,Mode patahan, Resin polyester,Serat sabut kelapa,Uji impact
Hydrogels having been developed so far are those with polymer bases without any additives. For the acceleration of wound healing, it can be developed hydrogels with the addition of banana sap (Musa Paradisiaca) as a drug that is expected to accelerate the wound healing process. The preparation of Banana PEO-PEGDMA-Hydrogel Banana was made using a new method of dissolving banana juice with PEO-PEGDMA before crosslinking. The formulations of banana sap concentration used ranged from 0% to 15% (volume) and they were irradiated with gamma rays. The characteristics measured include gel fraction, swelling ratio, velocity of water vapor transmission and mechanical properties. The chemical and morphological structures were analyzed using the Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM). The acceleration of wound healing speed was analyzed by invivo test. The results showed that the value of gel fraction, swelling ratio and velocity of water transmission of PEO-PEGDMA-Banana Gum hydrogel increased at a concentration of 0-15%. Hydrogel tensile strength decreased with the addition of banana sap and conversely the percentage of elongation of hydrogel increased with it. PEO-PEGDMA hydrogel film with the addition of banana sap has been proven to accelerate the wound healing through the Invivo Test. This shows that hydrogels can be developed from PEO-PEGDMA- Banana Sap which can be used as wound dressing.
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