The outgassing kinetics from siloxane elastomers is dominated by moisture desorption from the reinforcing silica filler and can be detrimental in moisture-sensitive applications. In this study, a custom 3D printable siloxane rubber (LL50) was analyzed in three different states: after a high temperature vacuum heat treatment, limited re-exposure to moisture after vacuum heat treatment, and in the as-received condition. The outgassing kinetics were extracted using isoconversional and iterative regression analyses. Moisture release by physisorbed and chemisorbed water from the samples have activation energies in the range of 50 kJ/mol (physisorbed type) to 220 kJ/mol (chemisorbed type). Overall, moisture outgassing from LL50 was 10 times lower than that from traditionally prepared siloxane rubbers. The vastly diminished moisture content in LL50 is attributed to the existence of a finite low level of silanol groups that remain on the fumed silica surface even after hydrophobic treatment.

硅氧烷弹性体的除气动力学主要由补强二氧化硅填料中的水分解吸所决定，并且在对水分敏感的应用中可能有害。在这项研究中，对定制的3D可打印硅氧烷橡胶（LL50）进行了三种不同状态的分析：高温真空热处理后，真空热处理后再暴露于湿气中的程度有限，以及处于接收状态。使用等转化和迭代回归分析提取脱气动力学。样品中被物理吸附和化学吸附的水释放的水分具有在50 kJ / mol（物理吸附型）至220 kJ / mol（化学吸附型）范围内的活化能。总体而言，LL50产生的湿气逸出量比传统制备的硅氧烷橡胶低10倍。