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Open AccessArticle

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

Chemical Engineering and Environment College, North University of China, Taiyuan 030051, China
Department of ESH, Science and Technology University of Sichuan Staff, Chengdu 610101, China
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518000, China
School of Ammunition Engineering, Army Engineering University, Shijiazhuang 050003, China
College of Engineering, Sichuan Normal University, Chengdu 610101, China
Authors to whom correspondence should be addressed.
Coatings 2018, 8(5), 175;
Received: 5 April 2018 / Revised: 24 April 2018 / Accepted: 30 April 2018 / Published: 4 May 2018
PDF [1573 KB, uploaded 24 May 2018]


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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