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International Journal of Polymer Analysis and Characterization Volume 21, 2016 - Issue 6
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Articles

Different catalytic systems on hydroxyl-terminated GAP and PET with poly-isocyanate: Curing kinetics study using dynamic in situ IR spectroscopy

Yajin LiSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China
,
Jie LiSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China
,
Song MaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China
&
Yunjun LuoSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing, ChinaCorrespondence[email protected]
Pages 495-503 | Received 07 Mar 2016, Accepted 04 Apr 2016, Published online: 02 May 2016
 
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ABSTRACT

Reactions of hydroxyl-terminated glycidyl azide polymer (GAP) or poly(ethylene oxide-co-tetrahydrofuran) (PET) polymers with poly-isocyanate (N100) were monitored by dynamic in situ Fourier transform infrared spectroscopy. The influence of catalytic systems on the cure kinetics of polyurethane reaction was investigated. From the comparison between GAP/N100 and PET/N100 systems, it was found that primary and secondary hydroxyl groups were differentiated due to the effects of steric hindrance. Using Arrhenius law and Eyring equation, the activation parameters of polyurethane reaction were calculated at different catalytic systems. The negative value of the activation entropy demonstrated an associative mechanism within the transition state.

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