ADCASAssociation of Ductwork Contractors and Allied Services (UK)
ADCASAlcohol and Drug Consultation and Assessment Services (Western Washington University; Bellingham, WA)
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In order to have a better understanding of the foaming process of irradiated polymers when ADCA is used as a chemical blowing agent, it is essential not only to understand the crosslinking reaction of the polymer matrix when electron beam irradiation is employed but also to analyze if there is an effect of the electron irradiation on the other components of the formulation and among them the impact on the decomposition kinetics of ADCA.
Neta and Whillans [30] performed a study based on the effect of irradiation (2.8 MeV electrons) on ADCA but in aqueous solution.
Taking these ideas in mind, this article is mainly focused on analyzing the effect of electron irradiation on the decomposition kinetics of ADCA and on determining which changes are produced in the ADCA particles.
ADCA Porofor ADCA/M-C1 with an average particle size of 3.9 [+ or -] 0.6 microns was supplied as a powder by Lanxess AG (Leverkusen, Germany).
Irradiation of the ADCA was performed at room temperature in air in Mevion Technology (Soria, Spain).
The thermal behavior and the decomposition kinetics of both non-irradiated and irradiated ADCA were studied using a Mettler DSC [822.sup.e] differential scanning calorimeter (DSC) previously calibrated with indium, zinc, and n-octane.
For the purpose of studying the thermal decomposition of the ADCA, the following heating program was chosen.
The temperature of the maximum and the width at mid-height of the exothermic peak that characterizes ADCA decomposition were calculated as an average of three measurements.
The thermal decomposition of irradiated ADCA was also studied by thermogravimetric analysis (TGA).
The proband was classified as ADCA type II according to the Harding clinical classification.
The proband was diagnosed as ADCA type III according to the Harding clinical classification.
The 3 surviving patients were diagnosed as ADCA type I according to the Harding clinical classification.