PHA与TDI本体聚合反应动力学

Reaction Kinetics of the PHA/TDI Bulk Polymerization

用滴定法测定了甲苯二异氰酸酯(TDI),聚酯多元醇(聚己二酸己二醇酯PHA)在无催化剂和有催化剂时的本体聚合反应动力学。结果表明,TDI和PHA为二级反应,无催化剂时反应活化能为41.58 kJ/mol,在二月桂酸二丁基锡(DBTDL)催化下,活化能降为34.02 kJ/mol,说明催化剂能有效降低反应的活化能,提高反应速率。但无论有无催化剂,反应后期体系黏度均升高,反应逐步转为扩散控制而偏离二级动力学规律。

Reactive kinetics of the toluene-2,4-diisocyanate（TDI）/polyhexa-methylene adipate diol （PHA） bulk polymerization with or without catalyst was studied by means of titration analysis. The results indicate that the polymerization of TDI/PHA is a second order reaction, and the activation energy is 41.58 kJ/mol without catalyst and reduced to 34.02 kJ/mol with dibutyltion dilaurate （DBTDL） as catalyst, indicating that the catalyst can decrease the activation energy and improve the reaction rate. The reaction system viscosity increases at the later reaction stage whether the catalyst in the system or not, and the reaction is turned gradually to the diffusion control and deviates from the second order reaction kinetics.