Kinetika Reaksi Poliesterifikasi Hidrolisat Shellac dan Anhidrida Ftalat Ditinjau Dari Reaktivitas Gugus Hidroksil

Lestari Hetalesi Saputri, Rochmadi Rochmadi, Budhijanto Budhijanto


This research presents polyesterification kinetics for shellac hydrolizate-phtalic anhydride. The polyesterification kinetics is proposed by assuming that the reaction  in ideal system, whereas the reactivity of the OH groups are considered different. Polyesterification was started from purification of shelllac by hydrolisis process. Hydrolisis was done by dissolving seedlac into NaOH solution and acidification with HCl. Polyesterification was conducted by reacting shellac hydrolizate with phtalic anhydride. Both of these materials were reacted in a three necked flask under vacuum condition. The reaction was conducted in temperature range of 130-170 0C and samples were taken every 30 minutes for a total of 5 hours, to determine the COOH concentration by titration. The investigation of reaction kinetic showed that reaction model  could describe the kinetic of polyesterification shellac hydrolizate-phthalic anhydride, especially for temperature below 150 0C. The reaction rate constants were obtained as follows:

k1 = 19.7 e (-3802.82/T) g/mgek.menit

k2 = 29.4 e (-4062.30/T) g/mgek.menit

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Flory, Paul J. 1953. Principles of Polymer Chemistry. Cornell University Press, New York.

Mujiyono, Jamasri, Santoso, B.R., Sutopo G. 2010. Rekayasa Biokomposit dari Sekresi Kutu Lak dan Serat Rami. Seminar Nasional Hasil–Hasil Penelitian Teknologi MIPA dan Sekolah Vokasi, Yogyakarta: 421-434.

Sharma, S.K., Shukla, S.K., Vaid, D.N. 1983. Shellac-Structure, Characteristic and Modification. Defence Science (33): 261-271. Delhi.

Sontaya, L., Chutima, L., Maneeluangtana-anan, Jurairat, N., Toshic, O., Yuich, T., Keiji, Y., Satit, P. 2004. Modification of Physicochemical and Mechanical Properties of Shellac by Partial Hydrolisis. International Journal of Pharmaceutical (278): 41-49. Thailand.

Danuch, P., Chutima, L., Manee, L., Jurairat, N., Pornsak, S., Sontaya, L. 2011. Fabrication of Thermally Stabilized Shellac Through Solid State Reaction with Phthalic Anhydride. Material Letters 65: 1241-1244. Thailand.

Fogler, H.S. 1999. Element of Chemical Reaction Engineering. 3rd. Prentice Hall International, Inc, New Jersey.

Haryanto, Rochmadi dan Arief, B. 2005. Kinetika Reaksi Poliesterifikasi Gliserol Asam Adipat. Teknosains, Yogyakarta.

Malcom R.S., (Penerjemah) Sofyan, Iis. 2001. Kimia Polimer. Pradnya Paramita, Jakarta.


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CHEMICA: Jurnal Teknik Kimia
ISSN: 2355-875X (print) 2355-8776(online)
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