Photopolymers with tunable mechanical properties processed by laser-based high-resolution stereolithography
Photopolymers with tunable mechanical properties processed by laser-based high-resolution stereolithography
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DOI：
10.1088/0960-1317/18/12/125014
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发表时间：
2008-12-01
影响因子：
2.3
通讯作者：
Spitzbart, M.
中科院分区：
文献类型：
--
作者：
Stampfl, J.;Baudis, S.;Spitzbart, M.
光固化快速成型（SLA）是一种广泛应用于原型和小批量产品制造的技术。SLA和相关的实体自由成形制造（SFF）技术的主要优点是它们能够以高分辨率制造具有复杂形状的零件。虽然近年来可用材料的范围已经扩大，但仍然缺乏可以用SLA常规处理的材料。在这项工作中，提出了一种微SLA（亩SLA）系统，它可以形成一些不同的光聚合物的分辨率下降到5 μ m的xy-平面和10 μ m的z-方向。该系统能够处理各种专门定制的基于丙烯酸酯化学的光聚合物。用于这项工作的材料范围从混合溶胶-凝胶材料（ORMOCER）到光交联弹性体和水凝胶。这些材料的弹性模量可以在几个数量级上调节，范围从0.1 MPa到8000 MPa。这些单体的反应性足以实现高达500 mm s（-1）的写入速度，这与商业SLA树脂相当。提出了各种测试结构，这表明在微机械系统中的应用程序以及在生物医学工程中的应用程序所需的部件的制造过程的适用性。使用该系统，可以制造直径为50 μ m，长度为1500 μ m的内部通道。还可以制造由固定轴和自由旋转的涡轮机轮组成的微机械系统。
Stereolithography (SLA) is a widely used technique for the fabrication of prototypes and small series products. The main advantage of SLA and related solid freeform fabrication (SFF) techniques is their capability to fabricate parts with complex shapes with high resolution. Although the spectrum of available materials has been widened in recent years, there is still a lack of materials which can be processed with SLA on a routine basis. In this work, a micro-SLA (mu SLA) system is presented which can shape a number of different photopolymers with resolutions down to 5 mu m in the xy-plane and 10 mu m in the z-direction. The system is capable of processing various specifically tailored photopolymers which are based on acrylate chemistry. The materials processed for this work range from hybrid sol-gel materials ( ORMOCER) to photo-crosslinked elastomers and hydrogels. The elastic moduli of these materials can be tuned over several orders of magnitude and range from 0.1 MPa to 8000 MPa. The reactivity of these monomers is sufficient for achieving writing speeds up to 500 mm s(-1) which is comparable to commercial SLA resins. Various test structures are presented which show the suitability of the process for fabricating parts required for applications in micro-mechanical systems as well as for applications in biomedical engineering. Using the presented system, internal channels with a diameter of 50 mu m and a length of 1500 mu m could be fabricated. It was also possible to manufacture a micro-mechanical system consisting of a fixed axe and a free spinning turbine wheel.