Kinetic study of HTPB (Hydroxyl Terminated Polybutadiene) Synthesis Using Infrared Spectroscopy

Heri Budi Wibowo; Widhi Cahya Dharmawan; Ratih Sanggra Murti Wibowo; Adi Yulianto

doi:10.22146/ijc.49863

Kinetic study of HTPB (Hydroxyl Terminated Polybutadiene) Synthesis Using Infrared Spectroscopy

https://doi.org/10.22146/ijc.49863

Heri Budi Wibowo^(1*), Widhi Cahya Dharmawan⁽²⁾, Ratih Sanggra Murti Wibowo⁽³⁾, Adi Yulianto⁽⁴⁾

(1) Indonesian National Institute of Aeronautics and Space – LAPAN, Jl. Pemuda Persil No. 1, Jakarta 13220, Indonesia
(2) Indonesian National Institute of Aeronautics and Space – LAPAN, Jl. Pemuda Persil No. 1, Jakarta 13220, Indonesia
(3) Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia
(4) Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia
(*) Corresponding Author

Abstract

A kinetic study of HTPB synthesis by radical polymerization of butadiene with hydrogen peroxide initiator was conducted using infrared spectroscopy. HTPB conversion was determined based on the conjunction termination rate constant, and all polymerization kinetics were evaluated to identify the constant. All polymerization steps (decomposition, initiation, propagation, conjunction, and proportional termination) can be evaluated based on polymer conversion and functionality from data provided by infrared spectroscopy. The investigation variables included the initial molar ratio of initiator to monomer (H₂O₂/butadiene) and the reaction temperature. These steps were assumed as the first-order reactions, giving constant reaction rates of k_d, k_a, k_p, k_t, k_tc, and k_td. The reaction rates obtained for these constants were 4.2 × 10^–5 sec^–1, 8.9 × 10^–4, 7.7 × 10³, 8.5 × 10⁷, 3.2 × 10⁷ and 5.3 × 10⁷ L mol^–1 sec^–1, respectively, with activation energy of 7608, 14188, 2247, 105, 87 and 135 kJ mol^–1, respectively. The determining step of the reaction rate was identified as the initiation reaction. HTPB conversion can be measured if all polymerization kinetics constants have been evaluated.

Keywords

polymerization; HTPB; butadiene

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DOI: https://doi.org/10.22146/ijc.49863