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Open AccessArticle

Kinetic Research on the Curing Reaction of Hydroxyl-Terminated Polybutadiene Based Polyurethane Binder System via FT-IR Measurements

1
Chemical Engineering and Environment College, North University of China, Taiyuan 030051, China
2
Department of ESH, Science and Technology University of Sichuan Staff, Chengdu 610101, China
3
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518000, China
4
School of Ammunition Engineering, Army Engineering University, Shijiazhuang 050003, China
5
College of Engineering, Sichuan Normal University, Chengdu 610101, China
*
Authors to whom correspondence should be addressed.
Coatings 2018, 8(5), 175; https://doi.org/10.3390/coatings8050175
Received: 5 April 2018 / Revised: 24 April 2018 / Accepted: 30 April 2018 / Published: 4 May 2018
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Abstract

Polyurethane binder systems based on hydroxyl-terminated polybutadiene (HTPB) possess several superior properties such as superior adhesion, high solid-loading capacity, outstanding mechanical performance, etc. They have been widely used in coatings and adhesives as well as in medical and military industries. The cure reaction between hydroxyl-terminated polybutadiene (HTPB) and diisocyanates plays a key role in the properties of final products as well as the adjustment of process parameters. FT-IR spectroscopy is applied to investigate the kinetics of the curing reaction of HTPB and isophorone diisocyanate (IPDI) in the presence of a low toxic and low viscosity catalyst, stannous isooctoate (TECH). The concentrations of the isocyanate groups (NCO) characterized by FT-IR during the cure reaction with respect to time were recorded at different temperatures and at constant stoichiometric ratio Rn[NCO]/n[OH] = 1.0. The kinetic parameters, i.e., activation energy (Ea), pre-exponential factor (A), activation enthalpy (ΔH) and activation entropy (ΔS) were determined. In addition, the curing process and mechanism of the HTPB-IPDI reaction are discussed. View Full-Text
Keywords: HTPB; binder; cure reaction; kinetics; mechanism HTPB; binder; cure reaction; kinetics; mechanism
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Guo, J.; Chai, T.; Liu, Y.; Cui, J.; Ma, H.; Jing, S.; Zhong, L.; Qin, S.; Wang, G.; Ren, X. Kinetic Research on the Curing Reaction of Hydroxyl-Terminated Polybutadiene Based Polyurethane Binder System via FT-IR Measurements. Coatings 2018, 8, 175.

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