This paper aims to investigate the printability of photocurable PDMS with digital light processing (DLP) in terms of dimensional accuracy, mechanical properties, isotropy and postcure shrinkage.,The photocurable PDMS was made from methacrylated PDMS-macromer and 2,4,6-Trimethylbenzoyldi-Phenylphosphinate (TPO-L) photoinitiator. The PDMS was printed using different orientations, sizes and post-exposure conditions and then evaluated by tensile test and microscope to determine the printability.,Printed parts show good accuracy and low shrinkage, but high directionality in modulus, ductility and strength. The dimensional error is less than 2% and the shrinkage rates are less than 0.52%. In contrast, the modulus varies between 0.87 and 0.96 MPa depending on print orientation, elongation varies from 34.7% to 66.4% and strength varies from 0.23 to 0.49 MPa.,This study quantitatively characterizes the printability of photo curable PDMS with DLP, which has not been reported elsewhere. This paper also discusses the challenges of PDMS printing for future advancement.

中文翻译：

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数字光处理印刷聚二甲基硅氧烷的机械各向同性和固化后收缩

本文旨在通过数字光处理 (DLP) 在尺寸精度、机械性能、各向同性和固化后收缩率方面研究光固化 PDMS 的可印刷性。,该光固化 PDMS 由甲基丙烯酸化 PDMS-大分子和 2,4,6-三甲基苯甲酰二制成。 -苯基次膦酸盐 (TPO-L) 光引发剂。使用不同的取向、尺寸和曝光后条件打印 PDMS，然后通过拉伸试验和显微镜评估以确定可打印性。打印的部件显示出良好的精度和低收缩率，但在模量、延展性和强度方面具有高方向性。尺寸误差小于2%，收缩率小于0.52%。相比之下，根据印刷方向，模量在 0.87 到 0.96 MPa 之间变化，伸长率从 34.7% 到 66.4% 不等，强度从 0.23 到 0 不等。49 MPa。，这项研究定量表征了 DLP 光固化 PDMS 的可印刷性，这在其他地方尚未报道。本文还讨论了 PDMS 打印对未来发展的挑战。