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One of the problems in the synthesis of Hydroxyl Terminated Polybutadiene for propellant binders is the level of vinyl is high (up to 30%), while the desired product is 20%. Vinyl bond can be reduced if the chain can be broken with the addition of a hydroxyl group. The research objective is to reduce the amount of vinyl structure in HTPB with the addition of double bonds in the vinyl by applying Sayef Sain reaction. HTPB is reacted with concentrated hydrogen peroxide with the Sain Sayef catalyst in the 1 liter autoclave reactor with ethanol for 1-3 hours at 100° C. After being purified by extraction in hot water and drying, it is analyzed by an infrared spectrometer. The result shows that there is a change in the concentrations of vinyl within the polymers produced by observing the absorption of vinyl groups at a wavelength of 690cm -1 . Optimal results obtained with vinyl content of 20% with a temperature of 100° C for 90 minutes. In general, the quality of HTPB can be increased by reducing the levels of vinyl which allowing the HTPB composition to have a vinyl content reduced to 19%. Abstrak: Salah satu permasalahan dalam sintesis Hydroxyl Terminated Polybutadiene untuk binder propelan adalah masih tingginya kadar vinil (sampai dengan 30%), sedangkan produk yang diinginkan adalah 20%. Ikatan vinil dapat direduksi jika dapat dipecah rantainya dengan adisi gugus hidroksil. Tujuan penelitian adalah mereduksi jumlah struktur vinil dalam HTPB dengan adisi ikatan rangkap dalam vinil dengan menerapkan reaksi Sain Sayef. HTPB direaksikan dengan hydrogen peroksida pekat dengan katalis Sain Sayef dalam reaktor autoklaf 1 liter dengan pelarut etanol selama 1-3 jam pada suhu 100 °C. Setelah dimurnikan dengan ekstraksi dalam air panas dan pengeringan dari air, dianalisis dengan spectrometer infra merah. Hasil pengujian menunjukkan bahwa terjadi perubahan konsentrasi kandungan vinil dalam polimer yang dihasilkan dengan pengamatan serapan gugus vinil pada panjang gelombang 690 cm-1. Hasil optimal diperoleh dengan kadar vinil 20% dengan suhu 100 °C selama 90 menit. Secara umum, kualitas HTPB dapat meningkat dengan mengurangi kadar vinil sehingga komposisi HTPB memiliki kadar vinil turun menjadi 19%.

jurnal teknologi dirgantara/jurnal teknologi dirgantara

ISOMERISASI POLIMER MELALUI REAKSI SAIN SAYEF UNTUK MENGUBAH KONFIGURASI HTPB (HYDROXYL TERMINATED POLYBUTADIENE) POLYMER ISOMERIZATION BY SAIN SAYEF REACTION TO MODIFY CONFIGURATION OF HTPB (HYDROXYL TERMINATED POLYBUTADIENE)