Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Diffusion Effect on Octogen Coating-Curing Kinetics with Polyurethane Using Infrared Spectroscopy

Heri Budi Wibowo
* ORCID logo ,
Hamonangan Rekso Diputro Sitompul
ORCID logo ,
Yudha Budiman
,
Bagus Wicaksono
,
Ahmad Jamaludin Fitroh
,
Ahmad Riyadl
,
Wiwiek Utami Dewi
,
Yulia Azatil Ismah
,
Dwi Setyaningsih
,
Aprilia Fitri Yastuti
,
Mohamad Baiquni
ORCID logo ,
Lilis Mariani
,
Anggaria Maharani
,
Herry Purnomo
ORCID logo ,
Kendra Hartaya
,
Retno Ardianingsih
,
Luthfia Hajar Abdillah
,
Sutrisno Sutrisno
ORCID logo
Version 1 : Received: 2 August 2023 / Approved: 2 August 2023 / Online: 3 August 2023 (09:49:40 CEST)

A peer-reviewed article of this Preprint also exists.

Wibowo, H.B.; Sitompul, H.R.D.; Budiman, Y.; Wicaksono, B.; Fitroh, A.J.; Riyadl, A.; Dewi, W.U.; Ismah, Y.A.; Setyaningsih, D.; Yastuti, A.F.; Baiquni, M.; Mariani, L.; Maharani, A.; Purnomo, H.; Hartaya, K.; Ardianingsih, R.; Abdillah, L.H.; Sutrisno, S. Diffusion Effect on Octogen Coating-Curing Kinetics with Polyurethane Using Infrared Spectroscopy. Coatings 2023, 13, 1584. Wibowo, H.B.; Sitompul, H.R.D.; Budiman, Y.; Wicaksono, B.; Fitroh, A.J.; Riyadl, A.; Dewi, W.U.; Ismah, Y.A.; Setyaningsih, D.; Yastuti, A.F.; Baiquni, M.; Mariani, L.; Maharani, A.; Purnomo, H.; Hartaya, K.; Ardianingsih, R.; Abdillah, L.H.; Sutrisno, S. Diffusion Effect on Octogen Coating-Curing Kinetics with Polyurethane Using Infrared Spectroscopy. Coatings 2023, 13, 1584.

Abstract

The kinetic analysis of octogen coating with a polyurethane base containing hydroxyl-terminated polybutadi-ene (HTPB) was investigated using infrared spectroscopy. The coating process involved a solvent method, where octogen and liquid polyurethane were mixed, the solvent was evaporated, and curing took place at an elevated temperature. The ratio of HTPB to diisocyanate was equimolar. Initially, the curing process occurred in the solvent system, followed by further curing in the bulk system. The kinetic analysis was performed using a modified diffusion-autocatalytic model, which includes non-catalytic, autocatalytic, and diffusion compo-nents. This model was compared with others during the bulk reaction and proved to be effective in correcting errors, particularly in the gel time region. Thermodynamic parameters were evaluated using the Arrhenius and Eyring equations. The reaction rate was initially controlled by chemical reactivity, but after the gel time, diffusion became the controlling factor. In the HTPB-TDI system, both the non-catalytic and autocatalytic parts decreased with increasing temperature, while diffusivity increased. It is worth noting that diffusivity is temperature-dependent. Different diisocyanates, namely toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HMDI), were studied, revealing that HMDI exhibited higher reactivi-ty than TDI and IPDI. The catalyst effect on reaction rate HTPB-TDI system is investigated. Catalysts adding (0.1%) to HTPB-TDI system is really decrease their activation energy by efectivity DBTL>FeAA>TPB. Catalyst not change their diffusivity.

Keywords

polyurethane coating; kinetic; octogen; coating; curing; HTPB

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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