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Citation: WANG Shi-Cai. Reaction Kinetics of Polyisocyanurate Modified by Urethane[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1117-1121. shu

Reaction Kinetics of Polyisocyanurate Modified by Urethane

WANG Shi-Cai ^,

1.
Chemical Engineering Institute, Qingdao University, Qingdao 266071

Corresponding author: WANG Shi-Cai,
Received Date: 2 November 2004
Available Online: 20 February 2005

The reaction kinetics of polyurethane formation and that of trimerization of isocyanate in a system of polyisocyanurate modified by urethane were studied by FTIR.The results show that the two competing reactions occurred and progressed simultaneously,and the trimerization was found to be first order,and the polyurethane formation was first order with respect to the isocyanate concentration and zero order with respect to the polyol concentration.At the same time,the effects of the catalyst(DMP-30) concentration and the initial reaction temperature on the initial rates of the two reactions were also investigated.The initial rate of the polyurethane formation appeared to be almost linearly dependent on the catalyst concentration.Only when the catalyst concentration reached a certain value,did the initial rate of the trimerization reaction increase greatly with increase in the catalyst concentration;the initial rate of the trimerization reaction increased with increase of the temperature when the temperature was low,but when the temperature was high(>50℃),it decreased with increase of the temperature,while the initial rate of the polyurethane formation always increased with increase of the temperature.
- FTIR,
- urethane,
- polyisocyanurate,
- reaction kinetics
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