Controlled cure is desired in many industrial processes to control open time, stress build-up, morphology and structure of cured materials. Curing strategies that include triggered release of an encapsulated active (e.g. catalyst, hardener) enable one-part curing systems - a mixture of encapsulated active and reactive prepolymer. The dynamic nature of cure triggered by release of encapsulated active, however, complicates the curing process. The catalyzed trimerization of a urethane prepolymer model system was studied to elucidate the polyisocyanurate (PIR) dynamic curing. Curing kinetic parameters of trimerization catalyzed by the neat and encapsulated catalyst were obtained with three kinetic methods by non-isothermal DSC. There was not much difference in total heat of reaction -ΔH_rxn but the polymerization onset, T_onset, and the peak temperature, T_p, were shifted towards higher temperatures, by 20 to 30 °C, with the encapsulated catalyst. In addition, the activation energy, E, the preexponential factor, lnA, and the overall order of reaction m + n were enhanced. Simulations show that the delay in the cure onset temperature is manifested as a lag time under isothermal conditions. This lag time was correlated to the apparent diffusion coefficient, D_a, using Fick’s second law of diffusion, which allowed modeling the temperature effect on the encapsulated catalyst release into the model prepolymer.

在许多工业过程中都需要控制固化，以控制固化材料的开放时间，应力累积，形态和结构。包括触发释放封装的活性物质（例如催化剂，硬化剂）在内的固化策略可实现单部分固化系统-封装的活性和反应性预聚物的混合物。然而，通过释放包封的活性物质引发的固化的动态性质使固化过程复杂化。研究了氨基甲酸酯预聚物模型系统的催化三聚，以阐明聚异氰脲酸酯（PIR）的动态固化。采用非等温DSC法通过三种动力学方法得到了纯净和包封的催化剂催化的三聚固化动力学参数。有没有在反应-Δ的总热量太大的差别ħ _RXN但是在包封的催化剂的作用下，聚合反应开始温度T_起始点和峰值温度T _p升高了20到30°C。另外，增强了活化能E，指数前因数ln A以及反应的总阶m + n。模拟表明，固化开始温度的延迟表现为等温条件下的滞后时间。该滞后时间与表观扩散系数D _a相关。，使用菲克第二扩散定律，该模型可以模拟温度对封装到模型预聚物中的催化剂释放的影响。