Dataset of "Stability Assessment of 3D Printed PVC/PVAc Filament from Waste Intended for PCB Substrates"

The growing emphasis on sustainability and circular economy principles has intensified research into the efficient recycling of polymer materials. However, the recycling of PVC and its blends remains challenging due to low thermal stability and the degradation that occurs during repeated processing. Here, we investigate the influence of aging on the behavior of material studied for printed circuit board substrates prepared from post-industrial PVC/PVAc waste by 3D printing. Using a range of measurement techniques, the properties of the substrates were characterized before and after accelerated aging (1−6 weeks). Size exclusion chromatography showed that, regardless of duration, aging did not significantly affect the molar mass of the material. Differential scanning calorimetry revealed that the glass transition temperature was fairly consistent, ranging from 73 to 77 °C, with a local maximum after 627 h of aging. Infrared spectroscopy demonstrated an exponential increase in the C=C or C=O to aliphatic C–H peak area ratio with aging time. Coupled thermogravimetric analysis-potentiometric titration showed that the amount of HCl released was largely unaffected by aging while that of the other degradation gases changed significantly. Overall, these results suggest that recycled PVC/PVAc materials retain sufficient performance after aging, but there is scope for improving the material through the incorporation of additional stabilizers and optimizing printing parameters before reusing this recycled waste material in sustainable additive manufacturing applications.随着全球对可持续发展与循环经济理念的重视程度不断提升，聚合物材料高效回收利用的相关研究也日益深入。然而，聚氯乙烯（PVC）及其共混物的回收仍面临诸多挑战，原因在于其热稳定性较差，且在反复加工过程中易发生降解。为此，本研究针对由工业后PVC/PVAc废料经3D打印制备的印刷电路板基板材料，探究老化对其性能的影响。本研究采用多种表征手段，对加速老化（1至6周）前后的基板材料性能进行了表征。凝胶渗透色谱（Size Exclusion Chromatography）测试结果表明，无论老化时长如何，均未对材料的摩尔质量造成显著影响。差示扫描量热法（Differential Scanning Calorimetry）测试结果显示，材料的玻璃化转变温度整体较为稳定，介于73至77 ℃之间，且在老化627小时后出现局部峰值。红外光谱（Infrared Spectroscopy）测试结果显示，随着老化时间延长，C=C或C=O与脂肪族C–H的峰面积比呈指数增长。热重-电位滴定联用技术（Coupled Thermogravimetric Analysis-Potentiometric Titration）测试结果表明，老化对释放的氯化氢（HCl）总量基本无影响，但对其他降解气体的释放量则有显著影响。综上，本次研究结果表明，回收得到的PVC/PVAc材料在老化后仍能保持足够的使用性能，但在将该回收废料重新应用于可持续增材制造场景前，可通过添加额外稳定剂、优化打印参数等方式进一步提升材料性能。